screw threads and tap-drill sizes - nist

CS24-43Screw Threads and Tap-Drill Sizes

U. S. DEPARTMENT OF COMMERCEJESSE H. JONES, Secretary

NATIONAL BUREAU OF STANDARDSLYMAN J. BRIGGS, Director

SCREW THREADS AND TAP-DRILLSIZES

COMMERCIAL STANDARD CS24-43

(Revision and consolidation of CS24”30 and CS25-30)

Effective Date for New Production from February 10, 1943

A RECORDED VOLUNTARY STANDARDOF THE TRADE

UNITED STATES

GOVERNMENT PRINTING OFFICE

WASHINGTON : 1943

For sale by the Superintendent of Documents, U. S. Government Printing Office

Washington 25, D. C. - Price 15 cents

U. S. Department of Commerce National Bureau of Standards

PROMULGATIONof


for

SCREW THREADS AND TAP-DRILL SIZES

(Revision and consolidation of CS24-30 and CS25-30)

At the request of the National Screw Thread Commission, AmericanNational screw-thread tables for shop use were circulated January 23,

1930, as recommended commercial standards to producers, distri-

butors, and users for a written acceptance. They were subsequentlyaccepted in writing by the industry and published under the titles,

American National Standard Screw Threads, Coarse and Fine-ThreadSeries, Commercial Standard CS24-30; and American NationalSpecial Screw Threads, Commercial Standard CS25-*30. .

On July 28, 1942, on the recommendation of the InterdepartmentalScrew Thread Committee, and with the endorsement of the standingcommittee, a consolidation and revision of CS24-30 and CS25-30,under the title of Recommended Commercial Standard for ScrewThreads and Tap-Drill Sizes, was circulated for acceptance. Thoseconcerned have since accepted and approved the standard as shownherein for promulgation by the United States Department of Com-merce, through the National Bureau of Standards.The standard is effective for new production from February 10,

1943.

Promulgation recommended.

Promulgated.

I. J. Fairchild,Chief, Division of Trade Standards.

Promulgation approved.

Lyman J. Briggs,Director, National Bureau of Standards.

Jesse H. Jones,Secretary of Commerce.

II

errata sheetSCRE'V THREADS AND TaP-DRILL SIZES

COW-iERClAL standard CS24-43

PAGE LINE NO’'^ reads SHOULD read

21 8 OF LAST COLUMN .3C86 .408623 8 OF COLUMN 3 5.30526 20 OF COLUMN 1 I 1/8 1 7/326 4 FROM BOTTOM, COL. 1 5 / 14 5 i7427 2 OF COLUMN ! 3/1 S 13/1627 4 OF COLUMN I 5/16 15/1627 14 OF COLUMN 5 1 .4183 1.481331 7 OF COLUMN 3 0.0006 0.005631 1 I OF COLUMN I MIN.

6

Ml N.535 heading, COLUMN 3 17/16 1 7/ 1 635 heading, COLUMN 9 \y/\6 1 13/1635 !3 OE COLUMN 10 I .8150 I.8I5345 2 FROM BOTTOM, COL. 1 5/16 F 5/1646 3 from BOTTOM, COL . 6 9/32 IN. 1 9/32 IN.46 2 FROM BOTTOM, COL . 6 19/64 IN. 1 19/64 IN.46 3 FROM BOTTOM, COL. 8 3 87

SCREW THREADS AND TAP-DRILL SIZES

(Revision and Consolidation of CS24—30 and CS25-30)


CONTENTS Page

Promulgation ii

Purpose 1

Scope - 1

Definitions 2Symbols 7Specifications 8

American National coarse-thread series 9American National fine-thread series • 12Uniform-pitch screw-thread series for high-pressure fastenings, boiler

applications, machinery components, etc 24Form of thread 24Thread series 24American National 8-pitch-thread series 24American National 12-pitch-thread series 24American National 16-pitch-thread series 25'

American National extra-fine-thread series 38Form of thread 38Thread series 38

Sizes of tap drills 42Labeling

,63

Effective date r-. 63Standing committee 63History of project 64Acceptance of commercial standard 67To the acceptors 68Acceptors 59Index 64Commercial standards 66

PURPOSEI

1. The purpose of this standard is to make available for conven-ient shop use and acceptance inspection the essential specifications,

definitions, and dimensional data on screw threads and tap drills,

which are recorded more completely in “Screw Thread Standards for

Federal Services, 1942,’^ National Bmeau of Standards HandbookH28.

SCOPE

2. This standard covers the predominating sizes of American Na-tional Screw Threads in the following series and fits, with the corre-sponding tap-drill sizes:

Coarse-thread series, sizes No. 1 (0.073") to 4", classes 1, 2, 3, and4 fits.

Fine-thread series, sizes No. 0 (0.060") to 1}^", classes 1, 2, 3, and4 fits.

1

2 Commercial Standard CS24-43

8-pitch-thread series, sizes 1" to 6", classes 2 and 3 fits.

12-pitch-thread series, sizes K" to 6", classes 2 and 3 fits.

16-pitch-thread series, sizes %" to 4", classes 2 and 3 fits.

Extra-fine-thi’ead series, sizes to 2", classes 2 and 3 fits.

Tap drills for No. 1 to 3%" coarse-thread series.

Tap drills for No. 0 to fine-thread series.

Tap drills for 1" to 3)^" 8-pitch-thread series.

Tap drills for to 3K" 12-pitch-thread series.

Tap drills for %" to 3K" 16-pitch-thread series.

Tap drills for to 2" extra-fine-thread series.

DEFINITIONS

3. Terms relating to screw threads and illustrations oj terminology.3a. Numbering oj tables and Jigures.—Since most of the figures and

tables herein are identical with those in National Bureau of Stand-ards Handbook H28, they are numbered identically for convenientcross reference, even though this results in some numerical discon-tinuity in this standard. Figures 1, 2, 3, and 10 illustrate the termsand symbols as defined.

3b. Screw thread.—

A

ridge of uniform section in the form of a helixon the external or internal surface of a cylinder, or in the form of aconical spiral on the external or internal surface of a cone.

3c. External and internal threads.^—An external thread is a threadon the outside of a member. Example: A threaded plug.An internal thread is a thread on the inside of a member. Example:

A threaded hole.

3d. Major diameter.—The largest diameter of the thread of thescrew or nut. The term “major diameter’^ replaces the term “out-side diameter’^ as applied to the thread of a screw and also the term“full diameter^ ^ as applied to the thread of a nut.

3e. Minor diameter.—The smallest diameter of the thread of thescrew or nut. The term “minor diameter” replaces the term “corediameter” as applied to the thread of a screw and also the term“inside diameter” as applied to the thread of a nut.

3f. Pitch diameter.—On a straight screw thread, the diameter of

an imaginary cylinder, the surface of which would pass through thethreads at such points as to make equal the width of the threadsand the width of the spaces cut by the surface of the cylinder. Ona taper screw thread, the diameter, at a given distance from a reference

plane perpendicular to the axis of an imaginary cone, the surface

of which would pass through the threads at such points as to makeequal the width of the threads and the width of the spaces cut bythe surface of the cone.

3g. Pitch.—The distance from a point on a screw thread to acorresponding point on the next thread measured parallel to the

axis.

The pitch, in inches,= — — ^—- •

Number oi threads per inch

3h. Lead.—The distance a screw thread advances axially in oneturn. On a single-thread screw the lead and pitch are identical; on

1 These terms are here defined because of possible confusion arising from the fact that an ‘‘internal

member” has an “external thread,” and vice versa. For the sake of brevity, an external thread is herein-

after referfed to a.® a “screw,” and an internal thread as a “nut.”

Screw Threads and Tap-Drill Sizes 3

a double-thread screw the lead is twice the pitch; on a triple-thread

screw the lead is three times the pitch, etc.

3i. Angle of thread.—The angle included between the sides of the

thread measured in an axial plane.

3j. Halj angle of thread.—The angle included between a side of

the thread and the normal to the axis, measured in an axial plane.

3k. Helix angle.—The angle made by the helix, or conical spiral,

of the thread at the pitch diameter with a plane perpendicular to the

axis.

31. Crest.—The surface of the thread corresponding to the majordiameter of the screw and the minor diameter of the nut.

3m. Root.—The surface of the thread corresponding to the minordiameter of the screw and the major diameter of the nut.

3n. Side or flank.—The surface of the thread which connects thecrest with the root.

. 3o. Axis of a screw.—The longitudinal central line through thescrew.

3p. Base of thread.—The bottom section of the thread; the greatestsection between the two adjacent roots.

4 Commercial Standard 0824-^3

3q. Depth of thread.—^The distance between the crest and the baseof the thread measured normal to the axis.

3r. Number of threads.—Number of threads in 1 inch of length.

3s. Length of engagement.—The length of contact between twomated parts, measured axially.

3t. Depth of engagement.—The depth of thread contact of twomated parts, measured radially.

3u. Pitch line.—An element of the imaginary cylinder or conespecified in definition 3f.

3v. Thickness of thread.—The distance between the adjacent sides

of the thread measured along or parallel to the pitch line.

3w. Mean area.—The term ‘‘mean area of a screw’’, when used in

specifications and for other purposes, designates the cross-sectional

area computed from the mean of the basic pitch and minor diameters.

4. Terms relating to classes offit and tolerances.

4a. Allowance.—An intentional difference in the dimensions of

mating parts. It is the minimum clearance or the maximum inter-

ference which is intended between mating parts. It represents the

Sci^eio Threads and Tap-Drill Sizes 5

condition of the tightest permissible fit, or the largest internal membermated with the smallest external member.Example:

One-half inch, class 1 fit, American National coarse-thread series:

Minimum pitch diameter of nut 0. 4500Maximum pitch diameter of screw . 4478

Allowance (positive) 0. 0022One-half inch, class 4 fit, American National coarse thread series:

Minimum pitch diameter of nut 0. 4500Maximum pitch diameter of screw . 4504

Allowance (negative) 0. 0004

Figure 3.—American National form of thread.

Note.—No allowance is shown. This condition exists in classes 2 and 3 fits, where both the minimumnut and the maximum screw are basic.

NOTATION^= 60

°

a =30°n=number of threads per inchir=0.866025 p = depth of 60° sharp V threadft =0.649519 p= depth of American National form of thread

54ft =0.541266 p=maximum depth of engagement1^18/1=0.613435 p

A=0. 125000 p=width of fiat at crest and root of American National form/=0. 108253 pi

f= depth of truncation

= 1.4ft 1

4b. Tolerance .—The amount of variation permitted in the size ofa part. Example:

One-half-inch screw, class 1 fit, American National coarse-thread series:

Maximum pitch diameter 0. 4478Minimum pitch diameter . 4404

Tolerance 0. 0074

4c. Basic size .—The theoretical, or nominal, standard size fromwhich all variations are made.

6 Commercial Standard CS2Jf.-43

4d. Crest clearance.—Defined on a screw form as the space betweenthe crest of a thread and the root of its mating thread.

4e. Finish.—The character of the surface on a screw thread or otherproduct.

4f. Fit.—The relation between two mating parts with reference to

the conditions of assembly, for example, classes 1, 2, 3, and 4. Eachfit has its proper place, and none should be regarded as superior or

Figuee 10.—Illustration of tolerances and crest clearances for class 8 fit.

inferior, provided that there is compliance with specification require-

ments under which it is manufactured and sold.

Class 1 fit includes screw-thread work in which the threads mustassemble easily, and where an allowance is required to permit readyassembly, even when the threads are slightly bruised or dirty.

Class 2 fit represents a high quality of commercial screw-threadproduct and is recommended for the major portion of interchangeablescrew-thread work, finished and semifinished bolts and nuts, machinescrews, etc., where no allowance is required.

Screw Threads and Ta'p-Drill Sizes 7

Class 3 fit is the same in every particular as class 2 fit except that

the tolerances are smaller. The class 3 fit is intended to apply to

interchangeable screw-thread work requiring the smallest practicable

tolerances. Tapped holes within class 3 tolerances are difiicult andexpensive to produce commercially.

Class 4 fit is designed for screw-thread work where extremely close

tolerances are required. In the manufacture of screw-thread productsto this class of fit, it will be necessary to use precision tools, gagesmade to special tolerances, and other refinements. This class of fit

should, therefore, be used only in cases where the requirements of themechanism being produced are exacting, or where there are special

conditions which make this class of fit necessary. In order to ensureassembly with the degree of tightness desired, it may be necessary,

in some cases, to select the parts when the product is being assembled.

4g. Neutral zone .—A positive allowance. {See Allowance, par. 4a.)

4h. Limits .—The extreme permissible dimensions of a part.

Example:

One-half-inch screw, class 1 fit, American National coarse-thread series:

Maximum pitch diameter 0. 44781 These areMinimum pitch diameter . 4404/ the limits*

SYMBOLS

5. Symbols for designating screw-thread standards and threaddimensions are a necessity in commercial and engineering practice.

The standardization of such symbols yields the usual advantages of

standardization. Those listed below have been in customary usefor many years, and their general use in standards, specifications, andtextbooks is recommended.

6. Identification symbols .—These are for use on correspondence,drawings, shop and storeroom cards, specifications for parts, taps,

dies, gages, etc., and on tools and gages.

6a. The method of designating a screw thread by means of symbolsis by the use of the initial letters of the thread series preceded by thediameter in inches (or the screw number) and number of threads perinch, all in Arabic characters, and followed by the classification of fit

in Arabic numerals. If the thread is left hand, the symbol “LH’’ shall

follow the class of fit. No symbol is used to distinguish right-handthreads. The number of threads per inch shall be indicated in all

cases, irrespective of whether it is the standard number of threads for

that particular size of threaded part or special. For screw threads of

American National form but of special diameters, pitches, and lengthsof engagement, the symbol ‘‘NS” shall be used. Examples:

American National coarse-thread series; MarkTo specify a threaded part 1 inch in diameter, 8 threads

per inch, class 1 fit 1"—8NC—

1

Threaded part 1 inch in diameter, 8 threads per inch,class 2 fit, left hand

^1"—8NC—2LH

American National fine-thread series:

Threaded part 1 inch in diameter, 14 threads per inch,class 4 fit 1"—14NF—

4

Threaded part Ys inch in diameter, 18 threads per inch,class 5 fit 18NF—

5

Threaded part, Ys inch in diameter, 44 threads per inch,class 2 fit 5—44NF—

2

700485°—46 2

8 Commercial Standard CS24-4^

American National 8-, 12-, or 16-pitch-thread series: MarkThreaded part 1 inch in diameter, 12 threads per inch,

class 3 fit 1"—12N—

3

Threaded part inches in diameter, 8 threads perinch, class 2 fit, left hand 1}^"—8N:^—2LH

American National extra-fine-thread series:

Threaded part 1 inch in diameter, 20 threads per inch,

class 3 fit 1"—20NEF—

3

American National form, special pitch:

Threaded part 1 inch in diameter, 18 threads per inch,

class 2 fit 1"—18NS—

2

Threaded part V/a inches in diameter, 20 threads perinch, class 3 fit, left hand lyi"—20NS—3LH

SPECIFICATIONS

7. American National form oj thread .—The form of thread profilo

specified herein, known previously as the ‘‘United States Standard or

Sellers’ profile”, is adopted and shall hereafter be known as the“American National form of tlu-ead”.^

7a. Angle of thread .—The basic angle of thread {A, fig. 3) betweenthe sides of the thread measured in an axial plane is 60°. The line

bisecting this 60° angle is perpendicular to the axis of the screw thread.

7b. Flat at crest and root .—The fiat at the root and crest of the basic

thread form is or 0.125X^5.7c. Depth of thread .—The depth of the basic thread form is

7. 7.0.649519

^=0.649519Xi?j or h= >

wherepitch in inches.

7i=number of threads per inch,

basic depth of thread.

7d. Clearance at minor diameter .—A clearance shall be provided atthe minor diameter of the nut by removing from the crest of the basic

thread form an amount such as to provide a depth of thread not less

than 53 to 75 percent (depending on the size), and not more than 83

K

percent of the basic thread depth.7e. Clearance at major diameter .—A clearance shall be provided at

the major diameter of the nut by making the thread form such that thewidth of flat shall be less than /^X^, but not less than K 4X 2?.

7f. Thread series .—The present coarse-thread and fine-thread series

are maintained, the coarse-thread series being the “United Statesstandard” threads, supplemented in the sizes below one-fourth inchby sizes taken from the standard established by the American Societyof Mechanical Engineers (ASME). The fine-thread series is com-posed of standards that have been found necessary and consists of

sizes taken from the standards of the Society of Automotive Engineers(SAE) and the fine-thread series of the ASME.

7g. There are indicated in figure 3 the relations as specified hereinfor the American National form of thread for the minimum nut andmaximum screw, classes 2 and 3 fits.

2 This standard, in substantially the same form, has been adopted by the American Standards Associa-tion. It is published, in part, as ASA Bi. 1—1935, Screw Threads, by the ASME, 29 West 39th Street, NewYork, N. Y.

Screw Threads and Taf-Brill Sizes 9

AMERICAN NATIONAL COARSE-THREAD SERIES

8a. The American National coarse-thread series, as specified in

table 1, is recommended for general use in engineering work, in

machine construction where conditions are favorable to the use of

bolts, screws, and other threaded components where quick and easy-

assembly of the parts is desired, and for all work where conditions donot require the use of fine-pitch threads. Limiting dimensions andtolerances for classes 1, 2j 3, and 4 fits are specified in table 15.

Table

1.

—

American

National

coarse-thread

series


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3 xJ -Si'S .j-

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00 i-H O 00 T-H

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1>- 05 CO I-H

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10 i-H CO oq(M 05 00 05 COCO CO !>• 00 050000000000

cq CO o 05 cq^ CO XO 00 COo i-H cq CO xo

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o CO o CO cqO xo lO Ilf 05o xo cq 1-H COxo xo CO 1>00000

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Screw Threads and Tap-Drill Sises 11

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o o o oo o o oo o o olO lO to to05 05 05 05

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05 00 to T-H

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AMERICAN NATIONAL FINE-THREAD SERIES

8b. The American National fine-thread series as specified in table

2 is recommended for general use in automotive and aircraft work,and where special conditions require a fine thread. Limiting dimen-sions and tolerances for classes 1, 2, 3, and 4 fits are specified in table

16,

Table

2.

—

American

National

fine-thread

series

Screw Threads and Taf-Drill Sizes 13

OT M f i

pq

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to CO O 0303 O 1-H CO rtÔ 1—< rH 1-H r—

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CO CO CO COCO CO CO COCO CO CO CO00 00 00 00oooo

•2 § .O ^•iti 'cH icri to to

. 03 to 00 1-H icH

Sto 00

1

-H to 00

to to CO CO CDO CO 03 001-H to 1-H 00 Htl

o 00 to CO oto CO 03 1-H oCO 03 to 1-H 1>1

00 to O to o00 l> to 03 O03 00 O 03

to O to o1> to 03 Oto 1> 03 1-H

(03 03 03 COCOHf^Tt(tO CO 1> 03 i-H (N to <33 03 torH IH 1-H 03 (03

00 1-H 00(N CO CO 00

o u

O•9 ag C3

00 O 00 032 CO to to to icfH

^ ictH to CO 1> 00Ho o o o o

to to 03 r^^ COto to 1x33 <33

<33 O (M H*< COO 1-H 1-H 1-H t-H

CO <33 to OCO 00 O (N toO to <N CO<M <N CO CO TjH

CO 00 00 (N 03O <M 00 C3<33 to CO 00 oHj<t0C01X33

l>l>t^l>CO 1-H CO 1-H1-H Thi CO <33O 1-H (N CO

a =3

<33 o (33 tog t-H Tj< to 1> 00Ci to CO 1> 00 <33

go o o o o

<N 00 01> 00o 1-H CO <33 <M1-H (C3 Tt< CO <33

00 Tt< <33 o tocotoi:^toi>(N 00 o CO(N (N CO TjH

Tt< <33 rtl CO COCO 00 <33 00 CO(M 00 O <N toto to l>i 00 03

<33 <33 <33 <33O to O to1X33 <MO 1-H CO

.2.1 '^

£ a

so CO CO 03 <N.cc CD !>• 00 03 1-HHOOOOi-h

to 00 o CO(N CO CO (33 1-H1-H 1-H 1-H 1-H <M

O to O to OO <M to Oto 1-H i> CO o<MC0C0'ct<tO

tOOOOO<M to O to OCO <M to Oto CO 1> 00 o

ooooto O to o(M t01> O1-H <M CO to

O <M ^ CO 00001> CO to Hjs

TjH o CO <M 00coco <M

oo-Kf HjH o o<N<N<N<M<M

00C0cO^'ct< <N<N<N(N

a- sHir, a>

Hi O,

Oi-h<NC0'cH lOCOOOi-Hi-H

05 lO Ttl to CO Ofl to 1-1 t}H CO 00 iH 1> rH CO iH-O 05 1-1 (N 'cjH 00 0<S t-h 1-1 05 TiH HjH lO CO 05 HjH

i?:«t-H 05 r-H 1-H O O t-H O 1-H TjH hJH » CO o 12- L- O^Seo (N o CO CO O CO CO O 05 05 05 05 O 05 05 OolO CO (M O 00 <N O 00 (M 05 1:^ O 05 1H to 05 CO

•fiOO 00 o O <N 1>- O 05 O 1> 00 CO O to 1>- CO CO^Ttl CO 1-1 to TjH O to CO 1-H 00 00 tH iH O iH iH O•ôq (N o <M C<J O <M O iH iH 05 05 O 05 05 O

«0 o1> lO <N O TJH CO O 00 <M CO 05 CO O CO 05 CO CO

.fS lO 05 CO 05 CO CO CO 05 CO rtH I> CO TfH 00 to COgi-H o O r-H O O 1-H O O CO CO 00 00 o 00 00 o

e ^(M (N O (M <M O (M (M O iH iH ^ iH O iH iH o5^ O1 io<M O 'cjH o O 00 (M CO 05 CO O CO 05 CD CO

fi 00 05 05 O CO CO O O 05 00 iH TH 05 05 COO Tff

05 gootô 05 00 o 05 00 O CO CO CD to O CO to oe ^1-i t-H o ^ ^ o ^ 1-H O 1H iH iH iH O IH iH oV g o

r*-o

C305 CO CO O CO T}H O HfH CO CO 1> CO 00 00 1> O 1:^

05CO

-e OQ to l>- 'icfH 00 to tH CO L- h3H to 05 00 CO CO iH 0500 lO o CO to o CO to O 05 05 hJH CO O rH rfH O

a§ g

lî-H rH oo

^ I-H O 1-H ^ O iH IH IH O ^ iH O

s?o

05 CO CO O CO ^ O H)H CO CO 1>. CO 00 00 1> Ot^<D sc CD 05 00 <M to 00 o 00 05 CO 05 CO 1> to 05

aa (N “cOOl o CO CO o CO CO o 05 05 tH iH O iH rH OCO ^rH r-l o l-H r-H O 1-H l-H O o o iH iH O iH rH O'O

§ a c3

P oa

X!E-i O (N 00 O <0> 00 O (M 00 CO CO GO TtH T^H 00 riH rH

o serjH 1> CO to o ^ to 00 CO CO TtH 1> 'H CO 00 CO 05r-( o <M <N O (N 1-H O 05 05 o o o O O O

p 1-H t-H O 1-H rH O o o iH iH O rH iH O3 c5

"TS c3

s g O (M 00 O <M 00 O Cl 00 CO CO 00 HfH tJh 00 rjH rfH

e •sc 1—1 Tti CO <M t> 'CfH (N to CO o l-H TtH iH CO to CO 05o ^1-H O O • 1-H O O IH o O 00 00 05 05 o 05 05 OCO •î-H 1-H O l-H l-H O iH iH O o o o o o O O Oo<r o

I-H 05 (N O CO ^ O 00 (M to HtH CO to 1H to CO 05tc 00 rH CO 05 -rjH Hti 05 (M CO 05 CO tJH iH CO to CO 05

60 CO 00 ^05 05 O 05 C5 O 05 05 O 00 00 o 00 00 O<W60 o o o o o O O O o o o o o O O O60 o

'vj

<N CO CD o o o O HtH CO CO tH CO 00 00 rJHrJH OoT ci to 05 to CO 'CfH CO O to CO TtH CO O 05 rJH 05 05<to 05 CO ôoi> o 00 00 o 00 00 o CO CO i> o !> O6J

5i

lo o o o o o o o o o o o o o o o oe5^

oCO i-H (N O (M 00 O 00 <M iH 00 05 CO CO 05 o 05

.«£(N 1> to CO 05 CO CO to CO CO 05 05 05 05 iH rH1-H CO O CO o 1> CO o to to CO to o CO CO oCO aooo o o o o o o o o o o o o o o

e C560

1 t 1 , , , , 1 1 1 11.o

, , , , 1 1

t-f1 1 1

60

<;>

g

[MaxMin.LToL

S .23S_g_H

-Max.o3 [Max,Min.[ToL

§.s-^

;fH

1

1

1

t;h

I

1

1

1

<& o O O 1 1

oj 1

•S'

•<s>ip

)

1

CC 1

^:

+C>

<D

a

Tii 1

o3 O 1

O fH 1

1

1

1

-+H

CD

a

1

1

1

1

I

1

•i 1'c

1

«

>

>

H1

tf 1

O 1

.a'

S o 1

^rS=i '

1

1

1

.a\

1

1

1

1

1

1

02 1 (-1 1 (h

t:j 1 ^H - 1 1 o

Table

15.- §

s.o

aa>

a

S

Q ^> CD

<1 "S

02 2Eh O

g ^m .o

'c?

a

tJh'’

X!0o3 jor

diamete

unfinished

u0HH)

(V

1;ho

0

a

hJh'"

730

Ua>

0)

a.a

,11

uo4ôa.a

c? CO g CO<o o

a c<r^ ^ a a 05’' ft ft

rH m0)

rH COo

05'

Cfi m c» b o3 02 CO 02 02cn CO CC O {H 02 CO Wc3 03 c3 fta 03 o3 c3 c3

o O o 6 o O 6

Screw Threads and Tap-Drill Sizes

O l><M xo xO O CO rH 1> xo iH rH O 05 XOO CO CO CO XO rH <N CO oq o CO cq xo O rH 05 CO iH1>1>0 1-H CO xo rH 00 o 00 O b^ O b^ O

<N O (M (M O CO oq oq o cq cq o cq o o o cq oo

no Gi CO 00 lo CO o O 05 i-H xo CO i-H iH CO rH CO 00 COTtH (N CO 1-1 o CO XO O i> cq xo iH CO o cq 00 iH

rH ,-H O i-H i-H O xo O 05 i-H iH cq o cq o cq o iH ocq oq o <M (M O cq oq th o cq cq o cq o cq o cq o

o1 1 t

1 1 1 o i-H 05 oq 05 xo CO cq CO CO rHI 1

I 1

00 CO (N 1 1 1 CO O O 05 00 CO rH cq CO H cq 1 1

00 00 o 1 1 i tH 00

1

- o CO 05 O <35 o <35 O 1 1

rH ,-H O I I 1 oq rH i-H O th O rH O -H o 1 1

1 1 I d t 1

Oi lO rJH

1 1 1

1 1 1 o 05 05 o 05 XO CO cq CO CO rH1 1

1 t

(N o cq 1 i 1 o xo 1-H cq b^ rH CO CO XO cq 1 1

<CO CO o I 1 1 05 XOrcH rH CO CO O CO o CO O 1 1

tH 1—1 O 1 1 1

i 1 1

iH iH O t-H O rH O IH o 1 1

1 1

1 1 1 d 1 1

1> 00 051 1 1

1 1 1 o rctH oq oq XO 00 rH 1> CO <35

1 t

i 1

CO 1-1 1-1 1 1 1 Tin 00 O 00 CO b^ CO CO cq xo iH 1 f^ o 1 1 I CO CO CO o rH rH O tH o r<H O 1 t

tH O 1 1 1 ’—1 i-H i-H O rH O rH O IH o 1 1

I I 1 d [ [

1> 00 051 1 1

1 1 1 o xo oq CO xo 00 rH CO 05I 1

1 t

1> IC rH 1 1 1 00 rCtH rCff O 1> IH CO o cq 05 rH 1 1

1 1 1 CO iH O tH iH cq o cq o iH O 1 t

tH i-H <5 1 1 I ’—1 iH IH o rH l-H O rH O iH O 1 1

1 1 ( d 1 1

1 1

00 1—1 b-1 1 1

1 ] I o oq 05 CO 00 cq <cq rH XO b-1 1

1 1

00 1-1 1 1 1 xo CO l> 00 00 cq CO th cq O rH 1 io o o 1 1 t oq O 05 o o ^ o rH o rH O 1 1

iH i-H o 1 1 1 rH O O rH rH O tH O iH O 1 (

1 1 1 d 1 1

00 rH b»1 1 1

1 1 1 o OO 05 05 00 cq rH cq rH xOb^1 t

1 I

lO rH I 1 1 oq CO 00 xo 05 CO 00 cq b- H05 05 O 1 1 1 05 00 o 05 <35 o 05 o <35 O 1 IOOO 1 1 1 OOO o o o o o O O 1 1

1 1 1 d 1 [

XO 05 CO1 1 1

1 i 1 o rH t)H b- xo CO 1-1 i> cq 1-H CD1 )

1 1

lO CO rH 1 1 I 05 CO xo 00 CO b^ cq t>- 1—

(

1 [

00 00 o 1 t i 05 00 1^0 00 00 o 00 o 00 o 1 1OOO 1 1 1 o OOO O o o o o o o t 1

1 1 1 d 1 (

05 lOI 1 1 o t-b-O rH cq 00 rH O <35 xo

1 1

1 1

(M 1-1 1 1 1 CO CO CO !>• rH b^ cq CO <cq xo iH 1 1o 1 1 1 00 b- CO o t> b- o b^ o o I 1OOO O OOO O o o o o o o 1 1

1 1 1 d 1 1

05 xoI 1 1

1 1 1 o CO rH cq 05 xo CO 00 <35 CO rHI 1

1 i

(M i-H rH 1 I 1 CO cq CO CO cq xo cq rH iH tH iH 1 1

CO CO O 1 t 1 1:^ CO xo O CO CO o CO O CO O ( iOOO 1 1 1 O OOO o o o o o O O 1 1

1 1 1 d 1 1.

1 1>

1 • 1

1 1 I

1

t 1 I

!!

1

^ ^j

^ ' * ^' ‘

1 1

1 1

fMax,Min.

[To1_

W -pH ^a_aH

d

§^ «rdTO TM ’75

SSh-Min. k Ib

i4Sh

X i

IB1 1 CQ

''^1

*

11 I 1 1

!

1

1

HiJ

0345>

03d

o4H

;h034-5

1

1

I

I

1

1

1

1

1 1 O 03 03 1 I 1 1

1

1

1

1

W s•H 1

a.a

1

1

i

I

I

I

1

1

1

1

1

1

1

1

1

1

1

1

0HPh

drO

1

1

1

I

1

1

1

1

1

1

1

1

1 1 03 1 1 1

1 1

<1'5° 44> 1 1 1

;ho <D B

'3‘ft o O <13 <V

-(H +3 +303d

Od 0 rH CD

HOd

03

dCD

Ca.H

S 12; 730

730

730

H fl B.H S

ccEh

o3 03 o3

rid co" CO CO rB pCi

t) o p o o o o4-5 oT (br cq"

-4^ 45

'Sh ft - ‘a ‘ft 04'

—

1 iH iH

CO 'tin' to cc CC 1-H cn' CO .

03 CD 03CO CO CO tc cc CO CO m 03to (O to cc cc CO CO CO 03 !

c3 o3 03 o3 c3 OS o3 cs3 o3

d O 6 O 6 6 6 6 6700485°—46—

3

See

footnotes

at

end

of

table.

Machine

screw

number

or

nominal

size

16 Commercial Standard CS2Ji.-Jt3

73QJ

.s

Cl

oO

so

C

Se

CO CO o O 00 (N ooo rH to CO 00 to CO 1-H6,0 ’-I 05 lO O lO CO 05 CO o <N CO CO o

lO (N •1:^ Tf (M CO CO rf i-H CO to i-Hso •geo COO CO CO o CO CO o 1-H (N (M O O^ 05 O

•^rH r-H C5 T-l 1—1 O rH 1—

1 O 1—1 rH rH rH d rH 1-H d1—1 CO 00 o o o ocq 00 00 i> CO 05 rf 05 1> to

»,CO T-H ocoi> O lO TfH o Tf CO O (N i> 00 00(N (N lO CO i-H lO (N (N to rJH 1-H to rf O

o<M (N O (M (N O <N (M O o o 1—( 1-H O 1-H rH Ot-H tH C> 1—1 t-H O i-H 1—

1 O 1-H 1-H O rH rH Oi-H CO 00 O O O O (N 00 00 CO 05 rf 05t^tO

^i-H CO rt< lOOOt^ lO O Tf to 05 00 to (N 05 CO 005i(M 05 (N (N O 1-t (N O (N Hf Tt^ (N 1-H rH CO 05 O

l> •gr-^OO rH ^ o ^ i-H O 05 05 OOO ooo1—i i—i O i-H i-H O 1-1 rH O ^ rH Q rH rH OCO (M O00(N O 00 (N (M CO rf CO 1-H 00 05 COCO 'sjt (M O lO 01>(M CO CO to rf rH 00 IH t>.

5i05 r^ (M O 00 ^ O 1>(M Tf rf 1-H O i-H IH r-l O00 e05 05 o 0050 O 05 o 00 00 05 05 o 05 05 O

o 1-i o 1-H O05 05 O o o o ooo CO 1> o 00 00 o,-( i-H o lo —1 to lO o to 00 05 05 O 05 10 1>-

lO (M CO 1-1 I> to (M CO CO 05 00 i-H O 05 oos gOO 00 o OOOOO 00 00 o 1> 1> t^tr- O 00i> o

oo

.s (N OOTiH O (N 00 O CO Ilf to CO 05 O (M O CO rf

oSi> 00 00 o r^ (N O rH 00 'If l> 05 CO 05 to 00 CO

•grtn oq i-H lO CO 1-1 to CO 1-H (N (N 00 O oot^ O2 eb-l> O l>t^ o o CO CO CO COO CO CO O

T3 •^ . . .

03

£o

tH O O (N 00 ooo 05 to rf 05 to O i-H 05<N lO 1> UO CO 1-1 to ooi> o CO CO rf 00 CO O to

•?<M O 1-H (N i-H i-H (N O 1-H CO to o CO CO oeco CO O^ .O

CO CO O CO CO O to to to too to to o

i-H CO 00 lO CO (N tOt^ 00 05 CO O 1-H 05 rf 00 COO lO (N 1-1 i-H (N CO to l> o CO 00 1> 00 05 to•CCO Ttl 1-1 CO lO i-H CO Kf rH lO CO 0050 ooogto »o o•'H . . .o

lO lO O to to o 'If f to rf O to to o

ooooo O CO O (N 00 -Cf CO 00 rf rf 000 05l> CO 0050 O to Tt^ CO to b*Ot^ O rf to

CO•«05 00 i-H OOOi-H OOOrH o o rf rf O to rf o§r^^ TtH O~H . . .o

lO o to rf o Tf rf rf rf O rf rf O

'CJH rH O i0»>00 to to o 00 05 ooo tH (N 05.

lO 1-H 05 b- CO Tf 05 05 (Mt^ iH CO rfSCO(M ^ CO<MO CO 01 iH Hf rf 00 00 o 05 00 0

is: e'<^ o Ilf o Tf Tf O CO CO CO coo CO CO o1

1

c5

(N CO CO ooo O^ CO to CO CO CO CO rf 05 toCO 0<M lO CO 05 to (N <N CO 00 (N CO CO rf 05 rf

!

•gl> CO i-H t>. CO o 1> CO 1-H 05 05 CO 05 O CO 05 OCO gcocoo CO CO o CO CO o (N (M CO COO CO COO

1

o

1 I I

( 1 1

1 1'

> 11 1

*

1

1 1 1 1 t 1

1 1 1

1 i 1

d c J iC5 ..-H 7? h d «

J

S-SJg_gH s gg^

I 0)

)

reJ X} 1

1

1 ] J

CO

8§

02I

^ 1

oa

O O 1

TJOl I

03 O •

1

1

1

C5•+5>

od

1

1

I

1

1

1

^ < c3 05 1 1 d 1 1

.2"o

« '

o ' 'B :^ O1

1

.a1

i

1

1

1

CC[

1-11

1 1

T3aSS

mfl

s ^1®

a

*H ^ 1

-S'd '

a 05 '

a'S :

sC5

a

od

a

1

C5

oa.a

I

1aCO

a g .2If

.S‘2 :.a rf

.a<a

oTjd

'^cd ;

Ui d I |L|

TOd

'B 'B

Q pq P dj

o o3 rd rdd «5 o5* CO a tH CO -(-5

ac<r

a ®.a ac<r

a 'St

OQa>

CQ05

rH ofQQ m ta Is o3 ea X> ta 59m to ta o3 2 OQ CO CO 5S

s 03 ra 03 o3

o 6 o o o o o

Screw Threads and Tap-Drill Sizes

l> eOT-i COOO O CO CO 0 t- 05 to 00 rH 00 rH CO CDCD 05 1^ CO to 05 00 CO rH CO 0 cot^ OCO<o »o O CO CO o tH rH 05 rH CO 00 rH 1> rH b- © 0(N<N O 05 05 O CO 05 rH 0 05 05 0 05 0 05 0 05 0

r-i rH O 1H rH 0 rH rH 0 rH d rH d rH 005 CO 05 OOO o 00 05 CO hJH t> to rH 0 05 0

1-H lO 00 lo 00 o 0 to to I> 05 05 to 00 CO to 0 CO»0 lO O to to o to rH 05 rH to D rH CO 0 CO 0 CD 0rH rH O rH t-H O CN rH 00 rH rH 0 rH 0 rH 0 rH 0tHtHO rH rH O rH rH rH 0 ,H rH d rH d rH d rH C5

05 CO 05 ooo o 00 ^ ^ 05 CO rtl t>. 10 rH 05 05 005 CO iO CO o CO to to 0 to 05 05 0 00 00 to to COC0O5 O CO CO o 05 OOt^ rH CO rH rH 0 CO 0 CO 0ooo ooo f—

H

05 05 © 0 0 0 00 00 0 0T—1 T—

1 O rH rH © ,H d rH d rH d tH d rH 000 tooot^ o to !>• 00 00 05 rH CO 05 ^ tob-00 CO to 05 CO 05 o 05 00 05 rH CD rH to rH 05tH rH O rH rH O o 1> CO rH rH 05 rH 05 0 05 0 05 005 05 0 05 050 o 00000 05 05 0 05 0 05 0 05 0

rH 000105 05 o 05IH05 00 00 0 00 0 br 05 05 rH05 COrH 05 to 00^ 05 05 0 05 b- to 050050 OOO I> CO to rH 0 rH rH 0 0 © 0 00001> o 00 00 O 00 l>l> 0 00 000 00 0 00 0 000

(d

OlOtO CO CO CO § COt^ CO 0 05 05 rH rH to to CO CO»0 O Tf< to CO 05 to -H CO to 't' 05 tH 0 05 rH b- 0500 00 o 00 00 o to to rH 00 05 0 05 0 00 0 00 0CD CO O CO CO O CO CO 0 CO CO 0 CO 0 CD 0 CDO

o'

000 05 lO Ttl rH o CO rH 0 to to 05 05 05 05 rH rHCD rH rH CO 05 to 05 CO CO CO 00 tH to OrH 00 05CO CO O CO CO o 05 CO C5 rH CO 0 0 1> 0 CD 0iQiO O to too CO to to 0 to too to 0 to 0 too

o'

'cH TjH O 05 050 to ocot^ rf CO 05 0 CO rH 0 rH 000 00 CO 05 05 to (M 05 00 coi>. rH to 05 rH 0 05OOO ooo CO 00t>- rH 0 rH 0 rH 0 rH 0 rH 0lOiOO to to o to ^ '!jH 0 to to 0 to 0 too to 0

o'

ocot^ tH to 05 o oi>co 0 05 05 05 05ococo O 00 rH o 05 CO (N 0 1>I> to to CO COlO'^G 10-^0

r^T^O o C5 rH rH to to 0 to 0 to 0 to 0O to rti 0 Ttl 0 rH 0 rH 0 rH 0d

>

rH lO CO tot^oo to rH (N 05 rH 0 0 05 t> CD 05 00»Ht>C0 rH 05 rH l> <N OtH rH 00 1> CO tH rH CO 05 rH05 00 0CO COO

05 00 0CO CO o CO CO rH 0 05 0

CO 0 05 0 05 0 05 0TjH CO COO CO CO 0 COO COOd

•^05 05 00 05 CO o rcfH CO rH CO 05 to CD 05 0 CDrH CO Tfl CO rH to OOl^rH 0 CO 00 rH CO CD rH

CO COO CO coo tH iH 0 rH CO TJH 0 CO 0 CO 0 CO 0CO 0CO coo CO COO CO CO COO CO coo COO coo

d1 t 1

1 1 1

( 1 1

t1 1 ft

1

1 1 1

t1 t j

1 1 1 1

1 1

1 1

1 1

1 1

§.a

1 I^

1

^ *

1

Si-S's'

SSh[MaxMin.[ToL [Max Min.

LToL

0 X 1

lgM I

II§-!

ShX I

IIm >H

1

1

1

1

ft

o IH

‘9x

1

0 1

ft 1

0ft

I

1

1

1

1

(

1

i

1

1

1

1

1

1

1

w ‘S’a S !

ft

.s1

1

1

1

1

1

1

1

1 tft ft 1 1 1 1 1

!

1

1

1

ftft

hjT

r 1

I

430-H

1

r

1

1

1

1

1

1

1

1

1

1

1

1

1

(u uo H T5

r1

33 !

S '

'ftus -a 1

us

C5 o MeS

o3 1 0H 0(H

0 0

1’B

1’B

M

§ CO CO I

33fto3

a

33

a.s 1 J

'B43 43

mH 05

"ccT ! CO rft 43 43 43o C5 0 0 0 0

’a

CO

H'ft

BQ0

r. ftrH 0

0§ B

05

m

H-3

'ft

H-=

'ft

05"

HH

'ft

CO

hh

ft

rH«) CO m KJ m OQ W GO m

JCO

rS T-B J Jm

JCO

jsQ o 0 0 0 0 u 0 0

17

Table

15

.

—

Limiting

dimensions

and

tolerances,

classes

1,

2,

3,

and

4fits,

American

National

coarse-thread

series

—

Continued

18 Commercial Standard CS2Jt.-Jf3

X

«D CO 00 o o o OCM 00 05 CO CM 00 CO CO oso CO (N O O (N 00 O 050 CO CO I-H O O CO Htl2^ 05 lO Tjl O 1>(M O to 00 05 CO CM CO <N T-H

i•§Oi 05 O O 05 o O 05 o CO CO 00 00 o ooooo•^CO CO O CO d 'cH CO d CO CO CO cod CO CO d

CO 00 00 o o o O CM 00 05 CO CM 00 CO CO Ogeo <N O O (N 00 O 05 o CO CO T-l O O CO ^

to <N (M to O 'CfH CO 00 CO CM 00 i>- t-H

l>t^O 1> I> o to to o to to oCO CO o CO CO d CO CO d CO CO CO CO d CO CO d

CO 00 00 o o o O CM 00 05 CO CM 00 TfH CO CO ogeo (M O O (M 00 O 050 CO CO 1-H o O CO tJH.iS 05 lO Ot^(M O to Tfi 00 05 CO r-H CM CO CM t-HO to 'stH O to O ^H CO CO o CO CO O

CO CO O CO CO d CO CO d CO CO CO CO d CO CO d

CO 00 00 o o o O CM 00 05 CO CM 00 CO CO Ogeo (M O o c<j 00 O 05 o CO CO t-H O O !>. COO Tti to O? (N to O Tti CO 00 CO CM 00 1>- t-H

C^ O CM ca o CM CM O 05 05 o o o o o oCO CO o CO CO d CO CO d cm’ cm’ CO CO d CO CO d

CO 00 00 o o o O CM 00 05 CO CM 00 'cjH CO CO Ogeo (N O O CM 00 O 050 CO CO t-H o O CO-C 05 lO O 1>- CM O to 00 05 CO T-H CM CO CM T-H

§ 0^ 05 o O 05 o O 050 CO CO GO 00 o 00 00 oci o CO cm’ d CO cm’ d cm’ CM cm’ cm’ d CM CM d

CO 00 00 o o o O CM 00 05 CO CM 00 rH CO CO ogeo (M O O CM 00 O 05 o CO CO ^ o o i> CO ^O 'cH to CM CM to o ^ CO 00 CO CM 00 £>• t-H

§1> l> o o 1> o to to o to to o(m' (ci o CM CM d CM cm’ d cm’ cm’ CM CM d cm’ cm’ d

CO 00 00 o o o O CM 00 05 CO CM 00Tt^ CO CO ogeo <M o O CM 00 O 050 CO CO ^ o o !>• CO ^^ 05 to O 1>- CM O to TjK 00 05 CO T-H CM CO CM 1-Hg'CtH-'CiH O to o to o CO CO o CO CO o*^05 04 0 CM CM d CM cm’ d cm’ cm’ cm’ cm d cm’ cm’ d

CO to 00 O CO O CM 00 1> O CO 'tH l> O l>gT^H CO O to o CO CO t-H 1> O i-H 00 to CO CMo CO to CM CM tO i-H CO !> 1> O 00 t-H O 05 1-Hg(N (M O CM CM O CM CM O 05 05 t-H o O 1-H O O

(ci (M o CM CM d CM CM O t—

I

t-H CM CM d CM CM d

CO to 00 O CO O CM 00 1> -CiH OCO'cH 1> O 1>-

g^ CO O 'Ch' to O CO CO T—

1

O t-H 00 to CO CMJS 05 to CO O CM O CO CO (M CM to CO t-H to.-ch 1-H

g cyi 05 o O 05 o o 05 o,

I> 00 00 o 00 00 o•

t-H t-H O CM 1-H d CM r-l o 1—1 ,-h’t-; d 1-H

d

00 O 00 O 00 CM O CM 00 'CtH CO 05 o 05 1-H,to CO

grtl t-H CO O CO CO O CO CO 05 'ClH tJH 00 CO O 00 t-H

-erJH T-i CO to CM CM lO 1-H CO 05 o t-H 05 t-H CM O t-Hto g t> o i:^l> O 1> I> o 'Ct^ to CO to o CO CO o

1—1 T-H O T-\r^d> T-l r-l d t-H t-H t-H d t-H 1-H O

CO o O 00 CM o o o 1—

J

to CO 00 to CO 1-H

gto 05 O 05 o O r-H C55 1-H to 1> CM ^ rH rH Ojs 05 (N O {>• CM O 1> CM 05 05 00 T-H 05 00 t-H

COg o tO'ci^ o to o CM CM CO CO o CO CO O

,-1 ^ d 1-H T—H O r-i T—! c5 T—

1

rH t-H 1—1 t-H O

U Q O OO Q O

ScreiD Threads and Tap-Drill Sizes 19

CO 03 !>.

t>* 1> <33 00 ^ Tt* o O Oh l> 1>'•qr

00 0 1-H 91<.'H ir-

<33 cq 91CO o CO CO o o to (M <M CO to cq to rH 91 0 91 000 00 o 00 00 o o 1> 1>0 00 00 0 00 0 00 0 00 0CO 00 (d CO CO o CO co’

d

CO CO d CO d CO d CO d

03 r-H 00 o 'tl O CO 0 91 CO 0 CO 1> 91 00t^l> C3 00 'Ct< Ttl o CO 03 1> 00 0 rH 91 t> (33 cq 9100I> o 00 00 o to O JXM 00 0 cq OrH <33 0 <33 0iO o lO »o o 1> to Tti o to CO 0 CO 0 to 0 to 0coc6 <d CO cod CO CO CO d CO CO 0 CO d CO d CO d

CO <33 1> 03 rH 00 o Ttn Tti O CO 091 CO 0 CO br 91 00t> 1><33 00 Tin o CO 03 !>• 1> 00 0 i-H 91 1> <33 cq 91eo <M o CO CO o o to cq (M CO to cq to rH 91 0 91 0CO CO o CO CO o to <M (M O CO CO 0 CO 0 CO 0 CO 0coco d CO CO d CO CO CO d CO CO 0 CO d CO d CO d

CO <33 1>. 03 T-l 00 o Ti^ hH O CO 091 CO 0 CO 1> 91 001> 1X33 00 Ttl o CO 03 !> 00 0 rH Tt1 1> <33 cq 9100 l>- O 00 00 o to oi> cq 00 0 cq 0 rH <33 0 <33 0O O O o o o (N O 03 o 0 I-H 0 i-i 0 0 0 0 0CO CO d CO CO d CO cocq d CO CO 0 CO d CO d CO 0

CO <33 i>. 03 t-H 00 o Tfl O CO 0-91 CO 0 COl^ 91 00<33 OO'^^ hH o CO <33 1:^ 1> 00 0 tH 91 1> 03 cq 91

CO (M O CO CO o o to (M (M CO to cq to rH 91 0 91 000 00 o 00 00 o o 00 00 0 00 0 00 0 00 0(N ca d (N (N d 03 (N <m’ d cq (M 0 04 d cq d cq 0

CO '33 1> 03 T-l 00 o Tbti tH O CO 091 CO 0 CO 1> 91 00t^i> 03 00 'CIH hH o CO OGi !>. 1> 00 0 1-H 91 1> <33 cq 91001> O 00 00 o to O !:>• cq 00 0 cq 0 t-H 03 0 <33 0lO lO O lO lO o to Ttl O to CO 0 CO 0 to 0 to 0<N (N d (m' (n d (N cq cq d cq cq 0 cq d cq d cq 0

CO 03 1>. 03 tH 00 o •91 Tti o CO 0 91 CO 0 CO 91 00t^l> 03 00 TtH Ttl o CO 03 1:^ 1> 00 0 t-H 91 1> <33 cq 91CO (N O CO CO o o to cq cq CO to cq 1-0 1^ 91 0 91 0CO CO o CO CO o to cq cq o CO CO 0 CO 0 CO 0 CO 0c00 <33 00 ^ ^ o to 91 1-1 1> 1-H 91 91 1> CO 03 l-H 91»0 CO 00 CD (M o CO 03 91 to 91 cb 00 cq 91 00 0 91O <33 o o o o to CO o cq 0 cq rH i-H 1—

1

rH 0 l-H 01-H O O rH rH O (N o o o rH 1-H 0 1-H 0 rH 0 l-H 0(N (N d (N (M'

d

(N cq cq d cq cq 0 cq d cq d cq 0

1> 00 <33 00 'CH o t0 91 rH 1> rH 91 91 CO 03 rH 91lo CO 00 CO D1 ^ o CO <33 91 to 91 00 00 cq 91 00 0 91»Ot*h O to lO o o 00 to cq to 1> T-H CO i-H CO 0 CO 000 00 o 00 00 o o 1>1> o 00 00 0 00 0 00 0 00 0,-4 T-; d 1—I T—I d (N rH' rH d 1-H 1—1 0 rH d 1-1 d l-H 0

rH 03(M 1—1 O rH o rH to CO 0 <33 b- CO CO cq cq l-HO tH 00 1-1 rtl o to CO T-H 0 !>• CO l-H 1—

1

00 00 91 91(N 3-1 O (N T-l O to to CO cq cq CO rH CO 1-H cq 0 cq 0CO CO O CO CO o 1> to to o CO CO 0 CO 0 CO 0 CO 0r-; 7-: (d rH rH <d i—i 1—1 d rH t-H 0 l-H (d t-H d 1-H 0

1> CO tH CO O CO o CO CO o 1> cq to 00 rH 00 l-H CO CO1-H T)H 1> (M 03 CO o 13^ <33 00 1

—1 CO 91 rH 0 00 1> to CO

03 00 o 03 GO O o CO tH rH <33 0 T-H 0 l-H 03 0 <33 0CO CO o CO CO o to CO CO o CO 91 0 91 0 CO 0 CO 0^ rH d th 1-i d r4 rH d 1-H 0 l-H (d rH 0 r-i d

I1 I

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1-H th"^ rH*' ^' +3 ’ft ‘ft ‘ft ‘ft

03 <3 9 <3

CO Ttl Hp

CO d<3 n 03 0

CD rjCO d<3 H ’-i' cq" co" 91"

03 CO CO o3 03 d CO d 03 CQ 03 03CO 03 i-j CO H CO 1-J CO 03 CO 03

03 (S o3 d o3 a Id 93 d d d d6 o 5 5 6 5 6 u 0

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o o o*-_4J o cl o. 9 bO

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; 2 o a gW ofeo 0.2-^+^

p-je -*^,0 'O 2 oa o ;I^^ o 5

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\4u&!,§l§^o,a

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lilill^ P o Q <15 ^

Machine

screw

number

or

nominal

size


'ego

O 00 (N to CO (M <N tOrtirH OT^^CO OrHCOCOOCOCO CO 00 to to rH CO to <M (M to rH rH

e s•5 CO (N i-H CO CO o 0050 OOO O O O O O O^ o CO CO Tt< CO O TtH rH o rH rH O rH rH OOtîO(N O (© CO 05 CO O CO 05 CO CO 05 to rH <N O <N

-CO ''ti o to 00 CO (N CO CO (N ^ i> rH CO 1> to (M Xl> 1-H

«l> CO o 1> CO o (N (N rH rH O rH tH O rH rH O«N ^CO CO o CO CO o CO CO CO CO o CO CO O CO CO O CO CO O

d(N O (N to 05 CO 1-H to CO rH rH CO rHOrHi>tO(M

^rH(N05 (M to CO o rH tJH 05 rti to (M CO tOCO<NtOTHrHto o O rH oo CO CO 001^ O 00 00 O 00 00 O 00 00 o

^CO CO o CO coo (N (N <N (N O <N (M O <M CQ O (N <M Oo00(NCO O 00 <N o (N CO CO CO 001> rH 00 CO (N O 05 T—

(

-OOO 00 O CO CO to CO to rH CO CO CO CO'^(MI>tOrH

;3!i 85O to 'CfH O o o (M (N O (N C<J O (N (N O <N O

^(N (N O (M (N O (N (N (M (M O <N (N O (N(NO<N<NOO •

00 (M CO O 00 (M o (N CO CO CO OOt^ rH 00 CC (N 1 1

CO 00 CO 05 CO (M tH 1> TtH (M 05 CO <N O (N 1 1

85•SÔO ^ O O 1> 05 00 O 05 OOO <35 <35 o 1 1

^(N <N O (M (M O 1—

1

rH rH rH rH O rH rH O < 1

O 1 1

05 CO CO O CO CO CO 00 00 I> O I> 1>- 00 <35 1 1

-00t- O TjH to o rH 00 tH CO 05 1XN <35t'- rH 1 1

_Jnc^

18 18 0005 00 O to lO CO CO o CO CO O CO CD O 1 1

CO rH ,-H o rH rH rH O rH rH O iH rH O 1 1

o 1 1

05 1>. (N o o o 00 05 05 CO CO O to to O (N <xi 1 1

-(N >Ot^ 05 to 00 05 th CO CO CO (N CO rH rH 1 1

.aoCO lO O CO to o (M (N TtH tJH o rH rH O rH rH O i 1

00 CO T—1 rH rH rH rH rH O rH rH rH rH O 1 1

p. o 1

1

t

O <M 00 O (M 00 CO CO 00 rtH 00 rH hH 00 rH !>• 1 I

»> o CO «) CO Tti CO 01> CO rH 05 (N rHOrH 1 1

geo CO o CO CO o o o (M rH O <M rH O <M <M O 1 1

«o rH t-H O rH rH rH rH O rH rH O rH rH O 1 1

d 1 1

rH O CO (M ,—1 CO rH (N (N 05 CO (N CO CO 1 1

-TfH CO to O CO 1> 05 CO CO 01>-(N O OOr-i 1 1

•gCSI rH O (M <N O 05 05 ooo rHOO rH O O 1 1

rH i-H O o o tH rH O rH rH O rH rH o 1 1

d 1 1

i-i 05 (M O CO rtt to CO to tH to CO <N to <35 CO 1 1

-tH CO (Nr^TfH to CO t> CO 00 CO (N 00 CO rH 1 1

oi-H O O tH o O 00 00 05 05 O 05 05 O <35 <35 O 1 1

rH rH O o o ooo OOO OOO 1 1

o 1 1

(N CO CO O O O CO CO 00 00 rH rH O rH <35 to 1 1

-00 cq to 05 to CO CO CO (N to (M 1> to rH 1 1

•§05 05 O 05 05 O l> 1> 00 00 o 00 00 o 00 00 O 1 1

CO ÔOO o o o o o ooo ooo OOO 1 1

d 1 I

CO i-H <N O <N 00 tH 00 (M CO CO 05 o 05 05 to rH 1 1

.to O to CO (N CO CO CO to (N (N to rH rH to rH rH 1 1

s•§00 00 o 00 00 O CO CO 1-r O 1> 1> o 1>1>0 1 1

CO o o O O O o o OOO ooo OOO 1 1

d 1 1

CO CO o O Tt^ CO CO o CO 00 to O <N 00 o i> CO 1 1

- (N to CO 05 CO to CO CO O (N rH (N rH rH (N rH 1 1

•St^ CO o 1> CO o to to CO CO o CO CO O CO CO O 1 1

so o o o o o o o ooo OOO OOO 1 1

1 d ‘ '

1 1

CO to 00 O CO o (N 00 <35 (N 1> <35 CO CO 1 1

-05 O CO CO tH 00 (N rH O rH rH O rH 1 1

o oto to o CO to o TJH to TtH O to to O to to O 1 1

o o o ooo o o OOO OOO OOO 1

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Screw Threads and Tay-DHU Sizes

CD TfH (N o t-H 1—

I

CD CD CD CD CO COl> O CO 1> »o O lO 00 CO 1> <N CD 1-H

CO 05 00 o o r-H O O O O O o oCO CO o ^ O CO O tJH O rH O

O Ttl 05 lO 05 »0 CD CM CO CO Tt< l-H <N»o CD 05 CO I> <N ^ l-H CO O <N <35 1-H

CO (M O iC O to o to o rH OCO CO CO o CO CO O CO o CO o CO O

lO 05 lO O CD !>. CO 00 CD (M(M COt> CD lO O TtH 00 CO 1> <N CD l-H

1> CD O 00 <35 o 00 o ooo 00 OCO (N (N O (N (N O (M O (M O <M O

o CO CO o 00 l-H CO <35 1-H O (N 05 rHo 1> 1-H CD CD 1-H TjH <35 CO <35 <N r-H

lO 1-1 1-1 o (M CO o (M O <N O (N O(N (N (N O CN <M O <N O (N O (N O

o »0 CO (M 00 1-H CO 05 l-H O <M 1 1

<o C01> CD (N Ttl to CO to iM 1 1

rH 00l> O (D5 <35 O 05 o 05 O 1 f

(N l-H 1-1 O l-H o ^ o l-H O 1 1

i i

1 1

o TjH (N lo 00 TtH CD 05 1 1o (M CD CD 05 CO CO (N <N l-H 1—

1

i 1

05 CD lO O 'CD 1> o 1> O 1> o 1 f

T-( ^ O tH t-H O l-H O 1-H C 1 i

I I

t t

o (N 05 CO o CD CD to to 00 00 1 1O CO CD CD <35 CO 00 <N 1> l-H 1 1

CD "sH CO O 'Ctl 'ct^ O Tj< O r!H O 1 1

1-1 tH O T-t O l-H O l-H O t I

t 1

i 1

o 05 05 0 00 (Cq TJ< <N to 1> 1 1

00 OW rH lO CO (N CO 1-H 1 1

CO 1-H T—1 O (M (M O <N O <N o 1 1^ ^ o l-H O l-H O r-H O 1 1

I t

1 1

o 00 tJH <N rfH <N to CO 00 CD 1 I

lO CD O CD O CO CO (3^ (M 1 1

(M O O O t-H l-H O l-H O r-H O i 1

T-i r-H O l-H O l-H O l-H O 1 i

1 1

1 1

o O ^ CD »o CD l-H <N l-H CD I 1

<N CD 05 CD 00 rH CO O <N O rH 1 1

tH <05 00 O <35 O O O O O O 1 1

rH O O O o l-H O 1-1 O l-H O 1 1

i [

1 1

o CDt^ 05 TtH (N 00 r)H O <35 to 1 1

05 lO 05 lO O (N <35 (N 00 1-H i 1

05 ooi> o 00 C35 o 00 O 00 o 1 1o o o o O O O O O o o 1 1

1 1

t 1

o CD 1-1 lo 05 lO CD 00 <35 CO 1 t

CO 'Cf 05 lO lO 00 (N 1> l-H 1-H 1 i

00 t>- CD O 1> 1> o 1> o o 1 1o o o o o o o o o oo 1 1

1 1

1 I

o O 'CJH o ID to Vj 00 CO CO I 1

CO CO 00 UO 'cjH CD tN to 1-H to 1-H 1 1

CD lO O CD CD O CD O CD O 1 1o o o o O O O o o o o I (

i 1

1 1

o ^ lO 05 <35 CO ^ CO <3q CO 1 1o t-h CD 1—1 (M CO 1-H CO 1-H i i

CD ID 'cjH O lO to O to o to o 1 1o O O O o O O o o o o 1 t

1 1

1 1

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1 1 1

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1 1 1 1

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co"1

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Miz; cnT S

TO<N g

o3

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-ao

-aoHH

<34H

CO t-T^ i-H ^ 'ft ‘ft ‘ft ‘fttH ;-i

D (o oOin oO D<n .S

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tn tnCO rt CO -rt tn tn tn tn

c3 fl 03 a o3 ft o3 c3 a aQ 6 6 6 o o o

See

footnotes

at

end

of

table.

Table

16

.

—

Limiting

dimensions

and

tolerances,

classes

1,

2,S,

and

4fiis,

American

National

fine-thread

series

—

Continued

22 Commercial Standard 0824-43

CO 00 00 o 00 oq Tt^ 00 to CO <05 <05 CO CO <05 <05 o Tt( or-H lO O 00 r-H- to 1> CO tot^ to O to to H hM CO Tf (M00 '-H O OD r-H <05 <05 rrf CO O 'cfH ^ O hJh o 'CtH rcH OtJH O 10^0 CO CO rCtH TJH O -ctH Tt( O rtr O Tfi HtH Or-H O tH ,-H O HH rH rH d H H d H H d H ,-H d

CD 00 00 o 00 oq 'sf< 00 to CO <05 05 CO CO <05 <05 o rcH Og(M CO ‘O lO CO r-H o cq 00 Ot^ O to to O CO H 05 oq

LO r-l CO rH H H o (MHO (MHO (MHO§co CO o CO CO o cq cq CO CO o CO CO o CO CO o CO CO orH rH o i-H rH O HH H H O H H d H H d H H d

CO 00 00 o 00 oq 00 to CO (05 <05 CO CO 05 <05 o ^ Or-H lO O 00 rH to CO to to O to to H CO (MCO i-H LO CO H 05 00 o <05 <05 o <05 05 O <05 <05 ooq o (N (M O H H H H O H tH O H H O H H O

rH rH O H H d HH H H d H ,-H d r-H r-H d H H O

CO 00 00 o 00 cq rcfH 00 to CO <05 <05 CO CO O <05 o '(f Og(M CO LO lO CO H o cq 00 o t> O to to O CO rrî H <05 IMfi oq o '-1 oq H H cq cq CO CO o 1> liO O 1> CO O CO Ogi-l r~l o H H o oo o o o o o o o o o o o orH ^ O H H o HH H ,-H d H ,-H d H ,-H d ,-H rH O

a> 05 o O <M 00 CO to to o CO 1X05 CO O CO O (M 001> CO ^ O O 05 o cq H CO CO CO o CO ^ (M H

0 05 00 rH O 05 o T—H r-H to o to TfH O to to o to to oS05 05 O O <05 o 05 05 <05 <05 O 05 05 o <05 <05 O <05 05 oO H d

05 05 O O oq 00 CO to to o O 1X05 CO O CO O (M 00^ oq GO rch lO LO 05 to 1> CO <05 00 CO H (50 to CO a5t>. Hot>. lO rH CO O oo 00 cq H o (M (M O (M (M O (M cq o^^00 00 o 00 00 o i> q> 00 00 o 00 00 o ooooo oooooo

oq CO CO o o o to CO CO CO CO rtl 05 to rcH (M (M 00 (M CO^00 to oq O H 05 H CO 1> H CO <05 rfH 05 CO CO 05 00 H

CD ^rcH CO rH to t}h O o o o o o o o o o o o o1>1>0 CO CO o !>!>> O 1>J> o i>i>-o

o

O 'CfH o 00 oq cq 00 CO CO 1> <05 00 H <05 05 o (M tr- to^CO oq rH to CO 00 to CO 1> H to 00 00 to CO <05 1>- H

00 ôq --I rH cq H o to to 00 00 o 00 GO O 00 00 o 00 00 o^Sco CO O CO CO O to to to to o to to o to to o to to oo

05 LO rcM to CO cq CO O0hJ>. rCfH CO H ^ O (M to05 rH cq rcti 00 cq rjH rjf <05 to CO (M rchi CO CO CO CO to H

CO OCO riH rH CO to o <05 <05 (MHO (M (M O (M (M O (M cq o»«LO LO O to to o to to o to to o to to o lO to oo

LO CO oq o 00 cq cq i> O <05 H to <05 CO to <05 CO 00 to COôoooo o cq !>• i> 00 CO O to l> CO CO tr- (M 1> CO H

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24 Commercial Standard CS24-4S

UNIFORM-PITCH SCREW-THREAD SERIES FOR HIGH-PRESSUREFASTENINGS, BOILER APPLICATIONS, MACHINERY COMPO-NENTS, ETC.3

FORM OF THREAD

9. The American National form of thread profile as specified inparagraphs 7 to 7f shall be used.

THREAD SERIES

9a. Where special threads are required, it is sometimes essential toselect a certain pitch as standard for a range of sizes. Also, in generalpractice, where the pitch of a special thread is optional, the uniformuse of a selected pitch is advantageous. For such applications 8, 12,and 16 threads per inch are widely used.

AMERICAN NATIONAL 8-PITCH-THREAD SERIES

9b. In table 26 are specified the nominal sizes and basic dimensionsof the “American National 8-pitch-thread series.’^ Limiting dimen-sions and tolerances for classes 2 and 3 fits are specified in table 29.

Bolts for high-pressure pipe flanges, cylinder-head studs, and similar

fastenings against pressure require that an initial tension be set up in

the fastening, by elastic deformation of the fastening and the com-ponents held together, such that the joint will not open up when thesteam or other pressure is apphed. To secure a proper initial tensionit is not practicable that the pitch should increase with the diameter of

the thread, as the torque required to assemble the fastening would beexcessive. Accordingly, for such purposes the 8-pitch thread hascome into general use.


9c. The nominal sizes and basic dimensions of the “American Na-tional 12-pitch-thread series’’ are specified in table 27. Limitingdimensions and tolerances for classes 2 and 3 fits are specified in table

30.

Sizes of 12-pitch threads from one-half inch to and including oneand three-fourths inches are used in boiler practice, which requires

that worn stud holes be retapped with a tap of the next larger size,

the increment being one-sixteenth inch throughout most of the range.

Die-head chasers for sizes up to 3 inches are stocked bymanufacturers.'**^

The 12-pitch threads are also widely used in machine construction,

as for thin nuts on shafts and sleeves. From the standpoints of gooddesign and simplification of practice, it is desirable to limit shoulderdiameters to }^-inch steps. The 12 pitch is the coarsest in general usethat will permit a threaded collar which screws onto a threaded shoul-

der to slip over a shaft, the difference in diameter between shoulderand shaft being one-eighth inch.

* This standard, in substantially the same form, has been adopted by the American Standards Association,It is published as ASA Bl.l—1935 “Screw Threads” by the ASME, 29 West 39th St., New Yor^ N. Y,

* See U. S. Department of Commerce Simplified Practice Recommendation R51-29, Die Head Chasers,



9d. The nominal sizes and basic dimensions of the ^^AmericanNational 16-pitch-thread series” are specified in table 28. Limitingdimensions and tolerances for classes 2 and 3 fits are specified in table

31.

The 16-pitch series is a uniform pitch series for such applications

as require a relatively fine thread. It is intended primarily for use onthreaded adjusting collars and bearing-retaining nuts.

Table 26 .—American National 8-pitch thread series

[Pitch, p=0.12500 inch; depth of thread, ft=0.08119 inch; basic width of flat, p/8 =0.01562 inch; minimumwidth of flat at major diameter of nut, p/24 =0.00521 inch.]

Basic diameters Thread data

Majordiameter,

D

Pitchdiameter,

E

Minordiameter,K

Metricequivalentof majordiameter

Helix angleat basicpitch

diameter,

5

Basic areaof sectionat root ofthread,

4

Inches Inches Inches mm deg minSquareinches

1 . 0000 0 . 9188 0. 8376 25. 400 2 29 0. 55101 . 1250 1 . 0438 . 9626 28. 575 2 11 . 72771 . 2500 1 . 1688 1 . 0876 31 . 750 1 57 . 92901 . 3750 1 . 2938 1 . 2126 34 . 925 1 46 1 . 15481 . 5000 1 . 4188 1 . 3376 38. 100 1 36 1 . 4052

1 . 6250 1 . 5438 1 . 4626 41 . 275 1 29 1 . 68011 . 7500 1 . 6688 1 . 5876 44. 450 1 22 1 . 97961 . 8750 1 . 7938 1 . 7126 47. 625 1 16 2. 30362 . 0000 1 . 9188 1 . 8376 50 . 800 1 11 2 . 65212 . 1250 2 . 0438 1 . 9626 53 . 975 1 7 3 . 0252

2 . 2500 2. 1688 2 . 0876 57. 150 1 3 3. 42282 . 5000 2. 4188 2. 3376 63 . 500 0 57 4. 29172 . 7500 2 . 6688 2 . 5876 69 . 850 0 51 5. 25883 . 0000 2 . 9188 2 . 8376 76 . 200 0 47 6 . 32403 . 2500 3 . 1688 3 . 0876 82 . 550 0 43 7. 4874

3 . 5000 3 . 4188 3. 3376 88. 900 0 40 8 . 74903 . 7500 3 . 6688 . 3 . 5876 95 . 250 0 37 10 . 10884 . 0000 3 . 9188 3 . 8376 101 . 600 0 35 11 . 56674 . 2500 4. 1688 4 . 0876 107. 950 0 33 13 . 12284 . 5000 4. 4188 4 . 3376 114 . 300 0 31 14. 7771

4 . 7500 4. 6688 4. 5876 120 . 650 0 29 16. 52955 . 0000 4. 9188 4. 8376 127. 000 0 28 18. 38025 . 2500 5. 1688 5 . 0876 133 . 350 0 26 20 . 32905 . 5000 5 . 4188 5 . 3376 139 . 700 0 25 22 . 37605 . 7500 5 . 6688 5 . 5876 146 . 050 0 24 24. 5211

6. 0000 5 . 9188 5 . 8376 152. 400 0 23 26. 7645

Identification

Threadsper inch

Inches

1 »

1/8----IK----1/8----

1/8

1/4

l/8_---22/8

2/2/2

2/

3

3/4

3/3/

4

4/4/2

4/

5

5/5/5/

6

1 standard size of the American National coarse-thread series.

26 Commercial Standard CS2Jf.-Jf.3

Table 27 .—American National 12-pitch thread series

(Pitch, p=0.08333 inch; depth of thread, /i=0.05413 inch; basic width of flat, p/8=0.01042 inch; minimumwidth of flat at major diameter of nut, p/24 =0.00347 inch.]

Identification Basic diameters Thread data

SizesThreadsper inch

Majordiameter,

D

Pitchdiameter,

EMinor

diameter,K



diameter,s

Basic areaof sectionat root ofthread,irKi

4

Inches Inches Inches Inches mm deg minSquareinches

V2 12 0. 5000 0. 4459 0. 3917 12. 700 3 24 0. 12051 12 . 5625 . 5084 . 4542 14. 288 2 59 . 1620

% 12 . 6250 . 5709 . 5167 15. 875 2 40 . 2097

'Yu 12 . 6875 . 6334 . 5792 17. 463 2 24 . 26353/4 12 . 7500 . 6959 . 6417 19. 050 2 11 . 3234

'^6 12 . 8125 . 7584 . 7042 20. 638 2 0 . 3895

% 12 . 8750 . 8209 . 7667 22. 225 1 51 . 4617

1^16 12 . 9375 . 8834 . 8292 23. 813 1 43 . 54001 12 1. 0000 . 9459 . 8917 25. 400 1 36 . 6245

lYie 12 1. 0625 1. 0084 . 9542 26. 988 1 30 . 7151

1%^ 12 1. 1250 1. 0709 1. 0167 28. 575 1 25 . 8118

IKe 12 1. 1875 1. 1334 1. 0792 30. 163 1 20 . 9147ly,^ 12 1. 2500 1. 1959 1. 1417 31. 750 1 16 1. 0237

1^6 12 1. 3125 1. 2584 1. 2042 33. 338 1 12 1. 1389

1% 2 12 L 3750 1. 3209 1. 2667 34. 925 1 9 1. 2602

l/l6— ---- 12 1. 4375 1. 3834 1. 3292 36. 513 1 6 1. 38761/2 12 1. 5000 1. 4459 1. 3917 38. 100 1 3 1. 5212

1% 12 1. 6250 1. 5709 1. 5167 41. 275 0 58 1. 8067

1% 12 1. 7500 1. 6959 1. 6417 44. 450 0 54 2. 1168

1/ 12 1. 8750 1. 8209 1. 7667 47. 625 0 50 2. 4514

2 12 2. 0000 1. 9459 1. 8917 50. 800 0 47 2. 8106

2% 12 2. 1250 2. 0709 2. 0167 53. 975 0 44 3. 1943

2y, 12 2. 2500 2. 1959 2. 1417 57. 150 0 42 3. 6025

2% 12 2. 3750 2. 3209 2. 2667 60. 325 0 39 4. 0353

2/ 12 2. 5000 2. 4459 2. 3917 63. 500 0 37 4. 4927

2% 12 2. 6250 2. 5709 2. 5167 66. 675 0 35 4. 9745

2/ 12 2. 7500 2. 6959 2. 6417 69. 850 0 34 5. 4810

2% 12 2. 8750 2. 8209 2. 7667 73. 025 0 32 6. 0119

3 12 3. 0000 2. 9459 2. 8917 76. 200 0 31 6. 5674

3/ 12 3. 1250 3. 0709 3. 0167 79. 375 0 30 7. 1475

3/ 12 3. 2500 3. 1959 3. 1417 82. 550 0 29 7. 7521

3/ 12 3. 3750 3. 3209 3. 2667 85. 725 0 27 8. 3812

3/ 12 3. 5000 3. 4459 3. 3917 88. 900 0 26 9. 0349

S% 12 3. 6250 3. 5709 3. 5167 92. 075 0 26 9. 7132

sYt 12 3. 7500 3. 6959 3. 6417 95. 250 0 25 10. 4159

3% 12 3. 8750 3. 8209 3. 7667 98. 425 0 24 11. 1433

4 12 4. 0000 3. 9459 3. 8917 101. 600 0 23 11. 8951

4/ 12 4. 2500 4. 1959 4. 1417 107. 950 0 22 13. 4725

12 4. 5000 4. 4459 4. 3917 114. 300 0 21 15. 1480

4k__ --- 12 4. 7500 4. 6959 4. 6417 120. 650 0 19 16. 9217

12 5. 0000 4. 9459 4. 8917 127. 000 0 18 18. 7936

Nii 12 5. 2500 5. 1959 5. 1417 133. 350 0 18 20. 7636

5/ 12 5. 5000 5. 4459 5. 3917 139. 700 0 17 22. 8319

5/ 12 5. 7500 5. 6959 5. 6417 146. 050 0 16 24. 9983

6 12 6. 0000 5. 9459 5. 8917 152. 400 0 15 27. 2628

1 Standard size of the American National coarse-thread series,

s Standard size of the American National fine-thread series.


Table 28.—American National 16-pitch thread series

[Pitch, p=0.06250 inch; depth of thread, ft=0.04059 inch; basic width of flat, p/8=0.00781 inch; minimumwidth of flat at major diameter of nut, p/24= 0.00260 inch]

Identiflcation Basic diameters

Threadsper inch

Majordiameter,

D

Pitchdiameter,

E

Minordiameter,K



diameter,s

Basic areaof sectionat root ofthread,icKi

4

Inches Inches Inches 771771 deg minSquareinches

16 0. 7500 0. 7094 0. 6688 19. 050 1 36 0. 351316 . 8125 . 7719 . 7313 20. 638 1 29 . 420016 . 8750 . 8344 . 7938 22. 225 1 22 . 494916 . 9375 . 8969 . 8563 23. 813 1 16 . 575916 1. 0000 . 9594 . 9188 25. 400 1 11 . 6630

16 1. 0625 1. 0219 . 9813 26. 988 1 7 . 756316 1. 1250 1. 0844 1. 0438 28. 575 1 3 . 855716 1. 1875 1. 1469 1. 1063 30. 163 1 0 . 961216 1. 2500 1. 2094 1. 1688 31. 750 0 57 1. 072916 1. 3125 1. 2719 1. 2313 33. 338 0 54 1. 1907

16 1. 3750 1. 3344 1. 2938 34. 925 0 51 1. 314716 1. 4375 1. 3969 1. 3563 36. 513 0 49 1. 444816 1. 5000 1. 4594 1. 4188 38. 100 0 47 1. 581016 1. 5625 1. 5219 1. 4183 39. 688 0 45 1. 723416 1. 6250 1. 5844 1. 5438 41. 275 0 43 1. 8719

16 1. 6875 1. 6469 1. 6063 42. 863 0 42 2. 026516 1. 7500 1. 7094 1. 6688 44. 450 0 40 2. 187316 1. 8125 1. 7719 1. 7313 46. 038 0 39 2. 354216 1. 8750 1. 8344 1. 7938 47. 625 0 37 2. 527216 -1. 9375 1. 8969 1. 8563 49. 213 0 36 2. 7064

16 2. 0000 1. 9594 1. 9188 50. 800 0 35 2. 891716 2. 0625 2. 0219 1. 9813 52. 388 0 34 3. 083116 2. 1250 2. 0844 2. 0438 53. 975 0 33 3. 280716 2. 1875 2. 1469 2. 1063 55. 563 0 32 3. 484416 2. 2500 2. 2094 2. 1688 57. 150 0 31 3. 6943

16 2. 3125 2. 2719 2. 2313 58. 738 0 30 3. 910316 2. 3750 2. 3344 2. 2938 60. 325 0 29 4. 132416 2. 4375 2. 3969 2. 3563 61. 913 0 29 4. 360616 2. 5000 2. 4594 2. 4188 63. 500 0 28 4. 5950

16 2. 6250 2. 5844 2. 5438 66. 675 0 26 5. 082216 2. 7500 2. 7094 2. 6688 69. 850 0 25 5. 594016 2. 8750 2. 8344 2. 7938 73. 025 0 24 6. 130316 3. 0000 2. 9594 2. 9188 76. 200 0 23 6. 6911

16 3. 1250 3. 0844 3. 0438 79. 375 0 22 7. 276516 3. 2500 3. 2094 3. 1688 82. 550 0 21 7. 886416 3. 3750 3. 3344 3. 2938 85. 725 0 21 8. 520916 3. 5000 3. 4594 3. 4188 88. 900 0 20 9. 1799

16 3. 6250 3. 5844 3. 5438 92. 075 0 19 9. 863416 3. 7500 3. 7094 3. 6688 95. 250 0 18 10. 571516 3. 8750 3. 8344 3. 7938 98. 425 0 18 11. 304216 4. 0000 3. 9594 3. 9188 101. 600 0 17 12. 0614

Thread data

Inches

He.Vs-He-1 __

iMe-

iHe-1/4-1^6-

iHs-iHe-VA-iHe-P/s-

P/16-P/4-.

VHe-1%-.l^He-

2 _-_

2M6-2/8-2/16-

2/4-

2/16-

2/8-2/ 6 -

2/2-

2/8 -

2/4.

2/8 -

3-_

3/8-

3/.3/8-

3/2-

3/8-

3/4-

3/8-

4__

standard size of the American National fine-thread series;

Table

29

.

—

Limiting

dimensions

and

tolerances,

classes

2and

3Jits,

American

National

8-pitch

thread

series

28 Commercial Standard CS24.-4S

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cs lO CO CO 0 CO CO 0 1> CD CO 0 CO CO 0 CO 0CQ (N 0 CQ CQ CQ d cq' cq' d cq' cq' cq d CQ CQ d (M* d0 00 CQ CO GO tH fir 00 CO CQ 0 to 00 00 iOI> 0 CQ20 T^^ 10 CO 00 b- 1-1 00 0 00 0 rd^ 05 Ttl 00 0 rH br 00

.cO 00 1-1 'CJH 1-H 0 tH rH 1-H 0 0 CO 1> rH rH CO rH CQ 0(M §10 tJH 0 CO 'd^ TJH 0 Tt^ rdH 0 to CO CO 0 rH rH 0 rH 0

' CQ CQ c5 CQ CQ CQ d CQ CQ d CQ CQ CQ d CQ <m' d <m' d0 00 CQ CO 00 00 0 00 1-H 1> 0 to 00 00 00 0 to 1>

gOxtH 10 CO 00 I> 1-I 00 rH 0 rH 05 00 <J5 rH cot^•ci lO CO ^ 05 CO 10 1-1 CD CO 0 to rH CQ rH CO l>rH 0

<N gCQ CQ 0 0 1-1 1-H 0 iH I-H 0 CQ rH rH 0 rH rH 0 rH 0^

cq' cq' 0 CQ CQ CQ 0 CQ CQ d CQ CQCQ'd CQ CQ* d CQ d0 00 CQ CO 00 1—

I 1> 00 CO 10 0 t> to 00 00 to CO togiO 05 »o CO CO 0 CO CO to 05 rH rH CO rH 0 rHfiCQ 0 i-H Ttl CO 1-1 rcfl CO 0 CQ 00 0 rH rH to rH to 01^ 1-HO 05 000 000 05 0 0 0 00 0 0CQ CQ' 0 tH CQ CQ d CQ CQ* d CQ rH CQ d CQ CQ d CQ d0 00 CQ CO 00 ^ 1d^ 00 to CO 0 to 00 00 (M rH rH CO

^0-^ 10 CO 00 000 GO 1-H 0 rH 05 rH 00 <35 0 COl^.«OOOi-i 1-1 Oi-f rH rH 0 0 CO 1> rH rH CQ rH CQ 0go 050 00 05 05 0 05 05 0 0 00 00 0 <35 <350 05 0CQtH 0 1-H 1-H ,-H d 1-H rH 0 CQ rH rH 0 rH T-H 0 1-H 00 00 CQ CO 00 00 0 00 00 0 0 1> to 00 00 00 0 00 0

05 10 rH CO CO 0 CO CD to 05 rH rH CO CO 0 0 1>.££l> lO r-l CQ 05 00 rH 05 00 0 1> CO to rH <35 0 rH 0 0goo 000 t>»b-0 1> 1> 0 00 00 0 00 0"î-H r-T 0 rH. rH* ^ d rH 1-H d 1-H rH rH rH iH d rH o'0 00 CQ CO 00 1-H t> 00 0 00 0 b- to GO 00 to l> CO 00SO 10 CO 00 05 05 00 CQ CO 0 rH 05 rH 00 00 <35 to CO.CIO 00 r-l 05 CO 10 0 CO CO 0 to rH CQ rH CO tô 1:^ 0|tî-o 10 CO CO 0 CO CO 0 1> CO CO 0 CD CD 0 CO 0

g ,-1 T-( 0 ,-4 r—

1

rH 0 rH rH 0 rH rH rH 0 t-H rH d rH 0CQ 0 00 CQ CO 00 »0 CO 00 CO to 0 l>i to 00 00 rH CO CO to

s »0 05 iO i-H CO 05 CO 1> CO to 05 rH rH CO CO <35 0 CO.cCQ 0 tH TtH CO 0 rd^ CO 0 CQ 00 0 rH rH to 0 to 0

S' go CO 0 'chi 10 10 0 to to 0 CD rH to 0 to too to 01-H 1-H 0 T—

)

1-H I-H d rH rH O rH rH rH d th' rH o' 1-H 00 CO CQ CO GO 00 0 00 to CO 0 to 00 00 00 0 rH COSO 0 CO 00 05 05 00 CQ CO 0 rH 05 rH 00 1> <35 to CO.CO OOrH 1-H 0 0 rH rH 0 0 COb- rH rH CQ 0 CQ 0glO -rfH 0 CO Tti 'd^ 0 Hf TJH 0 to CO CO 0 rH rH 0 rH 0

,-H 0 t-H ,-H rH d 1-H tH 0 rH t-H rH 0 rH* rH d rH d0 00 CQ CO 00 CQ CO 00 rH 0 i> to 00 00 rH CO 05 rH

gio 05 lO CO 10 00 CO CO to 05 rH CO CQ 00 <35 CO.Cl>. lOrH CQ 05 00 0 05 00 0 1> CO to rH <35 0 0 05 0geo CO 0 CQ CQ CQ 0 CQ CQ 0 CO CQ CQ 0 CQ CO 0 (M 0

t-H 1-1 0 rH rH d rH rH 0 rH rH rH d rH* rH* d rH* d0 00 CQ CO 00 10 CO 00 0 00 0 br to 00 00 rH CO CO 00so TtH 10 CO 00 0 00 00 CO to 0 rH <35 rH 00 tôo rH to-£LO CO I-H 05 CO CD 0 CO CO 0 to rH CQ rH CO i>o i>ogCQ CQ 0 0 lH rH 0 rH rH 0 CQ rH rH 0 rH 1-H 0 1-H 0

.

i-H 1—1 0 rH rH rH 0 rH rH 0 rH rH rH 0 rH* rH d rH 0

0 00 CQ CO 00 05 05 00 CO to 0 1> 10 00 00 1> <35 CO togtO 05 lO rH CO 10 1> CO 00 to to <35 rH rH CO rH <35 to.cCQ Oi-H 1> ^ CO 0 CO 0 CQ 00 0 rH rH to 0 rH 0

05 000 000 tH <3500 0 0 0 0 0rH rH rH rH 0 rH 01-H 0 rH* rH o' rH d

0 00 CQ CO 00 CQ CO 00 rd^ 0 1> to 00 00 rH CO CQ rH-O ^ 10 CO 00 1-H !>. 00 CO to 0 rH <35 rH 00 CO b- rH to

e« uO 00 rH 'dH tH rH 0 rH rH 0 0 COb- rH rH (CQ 0 CQ 0»SO 050 00 05 05 0 05 05 0 0 00 000 <35 <35 0 <350

t-h d rH d1 1 (

11

1

1 1 I

eo1 I 1

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1

1

tI xn o) <D a 10 <v <V a I 1

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ffi'ft

m to CiQ-'^ co" to to to cq"^ co"0 0 0 cu <3

to02 to to to to toto

to c3XSl to c/2 ^ to to to to f-i

% c3 0) o3 03 o3 c3 o3 <3 c<3

0 0 Q 0 6 6 6 0 6

Size

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Screw Threads and Ta'p-BtiU Sizes 29"

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32 Commercial Standard CS24--43

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31.

—

Liiniting

diniensiop.s

and

tolerances,

classes

2and

Sfd,

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National

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Table

31

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—

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dimensions

and

tolerances,

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2and

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Continued

36 Commercial Standard SC24-43

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o tc o3 m o COCO fHo3 05

02c3 ’c? c3 S

COo3

s 6 O § S Q 6

tolerances

i


000 CO Cd (M Xt^ COI-H 0 CO coo TfHcocd tOi-HobO ^ 02 CO 02Cdl> 02 UO 0 Cd 0 00 <32 cot^ <32Tti to«0 02 0 0^ lO »o 0 to kO 0 0 CO 0 to CO 0 to CO 0•go 02 0 02 02 02 0 02 02 0 0 (32 02 0 (32 (32 0 <32 (32 0

CO 0 CO CO cod CO CO 0 'CH CO CO d CO coo CO CO 0

000 CO Cd (M 'CtN 0 0 CO CO 0 ^ CO Cd 'Cfi 'CH 01=10 CO 02 Of) ^ l>i> ^ 02 to to !> to 00 TjH T-(l> <32 to

s. ^l> CO 0 02 CO (N 0 CO Cd 0 1> 0 T-H 0 CO 'cH 0 CO CO 0co' §00000 00 00 0 00 00 0 00 00 00 0 00 00 0 00 000

’^cocoo CO CO CO 0 CO CO d CO CO CO 0 CO CO d CO CO d

000 CO CO tH ^ 0 0 CO CO 0 -cH to T-i 'CH 0gOk-f 02 CO 02 Cdl>. (02 ^ to 0 Cd 0 00 (32 C01> (32 ^ to^10 0 r-- 000 000 to 00 (32 0 Ok-I 0 Oi-I 0

CO §1>-1>0 CO i>t^ 0 1>- 1> 0 i> CD CO 0 !>!> 0 I> 1> 0CO CO c5 CO CO coo CO CO d CO CO CO 0 CO CO d CO CO ©

000 CO CO T-< to (02 0 CO CO 0 to cH tJH CO ©1=10 CO 02 Of) 02 to to 00 T—( !> XtH <32

^(N Ti 0 Tt^ 001> 0 00 0 Cd to CO 0 00 <32 0 00 00 0CO §CO CO 0 10 10 10 0 to to 0 CO to to 0 to to 0 to to 0

CO cod CO CO coo CO CO d CO CO CO 0 CO CO d CO CO d

000 CO Ttl 0 to 02 0 CO CO 0 0 rlHCO©s=o rH 02 CO 02Cdl>. (02 'kf 0 Cd 0 00 <32 CO © ^^0 02 0 (N 10 10 0 to to 0 0 CO TjH 0 to CO 0 to © 0

CO §10 0 'ct) ^ TjH 0 Ti^ 0 to Tt( 0 TjH rti 0 0CO CO d CO CO CO 0 CO CO d CO CO CO 0 CO CO 0 CO CO d

000 CO Tt^ 10 02 CO 00 0 CO CO 0 Tti CO <32 TfH Cd 00gio CO 02 00 Tl^Jl> CO ^ <02 Tin to to 00 T-( CO © ^

NfO ^1> CO 0 02 CO cd 0 CO Cd 0 l> 0 T-H 0 CO Tt( 0 CO CO 0CO §CO CO 0 (N CO CO 0 CO CO 0 CO CO CO 0 CO CO 0 CO CO 0

"^co CO d CO CO CO d CO CO d CO CO CO 0 CO CO 0 CO CO d

000 CO 10 02 T^^ CO 00 0 CO CO 0 ^ CO <32 ^ Cd 00gOT-i 02 CO 02 cd CO (02 ^ 0 Cd 0 00 <32 CO CO © Tin tJH-CIO 0 000 000 to 00 (32 0 0 '-H 0 0 0

CO §(N (N 0 t-H cd cd 0 Cd Cd 0 Cd T-( T-H 0 Cd Cd 0 Cd Cd 0"^co CO d CO CO CO d CO CO d CO CO CO 0 CO cod CO CO d

000 CO Tti CO 00 ThH>l> 0 CO CO 0 Tt^ Cd 00 'c^l t-H 1>gio CO 02 00 0 TiH (02 'CH to 1> to 00 Xhi 1-H CO Tt) 02 ^^(N i-H 0 'ct^ 001> 0 00 0 Cd to CO 0 00 <32 0 00 00 0

CO § T—( T—1 0 0 000 000 000 000 000

"^co CO d CO CO CO d CO CO d CO 03 CO 0 CO CO 0 CO CO d

000 CO 0 CO CO 0 TtH rHlr^ T-H>go I-H 02 CO 02 Cd CO 02 'sH 0 Cd 0 00 <32 CO CO © Tfi rf)^0 02 0 (N 10 »o 0 to to 0 0 CO 0 to CO 0 to © 0CO §0 02 0 02 02 02 0 (02 (020 0 (32 (32 0 (32 (32 0 © © 0CO (M 0 <M Cd Cd 0 Cd Cd 0 CO Cd Cd d Cd Cd 0 Cd' Cd d

000 CO tJh 00 CO rfH 00 CO 0 CO CO 0 XiH 0 CO TfH 0 ©gio CO 02 00 CO Tti (02 -cH to to 00 TjH tH CO Tt( © rjHJS1>. CO 0 02 CO Cd 0 CO Cd 0 J> 0 T-H 0 CO r^^ 0 CO CO 0

<N §00 00 0 l> 00 00 0 00 000 00 00 00 0 00 00 0 00 00 0d d d (N Cd Cd 0 Cd Cd d Cd Cd Cd d Cd Cd d Cd Cd d

000 CO TJ^ 00 CO 00 CO 0 CO CO 0 0 CO TtH 0 ©go 1-1 02 CO 02 cd<o <02 rJH ^ 0 Cd 0 00 (32 CO CO © -^ 'rjH

-iiO'cJ^ 0 000 000 to 00 <32 0 0 T-l 0 0 r-H 0C<l 21>1> 0 CO 0 l>tÔ i> CO CO 0 1>1>0 0

oi 04 d o4 Cd Cd 0 Cd Cd d Cd Cd Cd d cd'cdd Cd Cd d

S.S3 g

s«om

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I

(D I

Sc3 02

-2 oa g- be

M o

SSh gw

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02 I

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o

O

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o

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^ 55<«^ a^ _ __-^te'r s's-g^^'g-s

1 1- §5 § alaWgpllfgakâ

i'g^.s-s^-qa^Sx

aia)i-'§-2>9c3 S

0.2 S.O § a

"Si a a-5^'^

^SB ^x-g-g gWgagS I a a

âa^S;^«|§5 3 03 CD-a^S'g-Qgasa^sqg'gag5ao5ag>aW

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.

.sa


AMERICAN NATIONAL EXTRA-FINE-THREAD SERIESFORM OF THREAD

10. The American National form of thread profile as specified inparagraphs 7 to 7f shall be used.

THREAD SERIES

10a. The American National extra-fine-thread series is intended for

special uses where (1) thin-walled material is to be threaded, (2)

thread depth of nuts clearing ferrules, coupling flanges, etc., must beheld to a minimum, and (3) a maximum practicable number of threadsare required within a given thread length. This thread series is thesame as the SAE extra-fine-thread series, but it includes additional

sizes. The nominal sizes and basic dimensions are specified in table

34. Limiting dimensions and tolerances for classes 2 and 3 fits arespecified in table 35.

Table

34

.

—

American

National

extra-fine-thread

series

Screw. Threads and Tap-Drill Sizes 39

.2 1 o ISj

PQ O CS

00 CO00 J>* O rH

fiCO lO 00 (N CO~OOOi-Hi-t

S?!

1W

•S 05 l> CO rfH (Ng(M lO CO CO

a>«

a.ci =®.2,2 -

-ti cs R -S

00005 05,C0 CO CO ^ 'ctH

so o o o oô o o o o

1—I rH 1—1 CO CO^ 05 05 05 rJH

oCO CO CO ^ tJHo o o oô o o o o

a S

PS

o o o o o^co CO CO cq (N•So O O CO CO

(M (M cq"ô o o o o

lO lO lO 1—H r—

I

(M <M i>O 1-H rH tO i-O

SCO CO CO CO COô o o o o

Cj tj >-*

h <3 C3 2

^ &o'-3

O 00 uo CO O^lo CO cq 1-H oSCO 05 lO r-

1

CO i> 05 i-H cq

.agtsj

si

Thi 05 rtl 1-H CO2 05 .-I rJH r-H CO<£O 1> CO 05 lO^ oq CO CO 'ct^

PM i-S

cq t> CO 00g05 cq Tt^ -ct^ CO^ (M 05 lO t-h 1>§ oq cq CO 'cH 'sH

S.2Ta

o lO O uo oSo (N lO I> O^lO T-i i>. CO oe oq CO CO Tti lo

g.a

(N cq oq 00 00CO CO CO oq (M

O O rH lO 00CO CO >0 00 00o lo 1-H CO CO(MoqcocOTi<

uO CO 05 CO OCq 1—I T—I r—

I

^ Thi Tti 00 00O Ot-h r-H T-i cq cqo o o o oo o o o o

T—I 1—I T—I lO uooq (M cq cq (NuO uo uO CO COO O O O Oooooo

CO CO CO 00 00OOO^TÎl>b-l:ôq oqoq oq oq CO COooooo

O OCO CO CO o or-H T- rH O O

rcH UO lOOOOOO

00 uo CO O 0000 1> CO uo COCM 00 'Ct< O CO

uo 1> 05 o,-H rH rH ,-1 cq

05 rjH o uo00 O CO uo 1>o CO 00uo uo CO CO !>•

05 uo Ouo O 1:^ OCO 05 O 1-1 00uo uo CO l> 1>1

uo O uo o uo(oq uo i> o oqCO cq 00 uo 1-1

uo CO CO t>- 00

T^^ tJh O Ocq cq cq (M oq

CO 05 CO oquo 1-^ CO otH 05 ooi>uo uo CO

'ct^0^>05uo uo

THrHOO

uo o uo oq01^05 00

00 o00 05 o oq

CO CO O 00uo uo uo

oooo

OOtht^<CO Tfl rH Ttl

CO CO O HtiCO'^COt^

uo CO oq orCH TfH

oooo

i>cocoi>.CO 05 I> rH05 TjH 00 0500 O 1-H 00

i-H oq oq oq

00 l> O uoCO CO ^ CO

oooo

00 00 OO rH rH rH rH rH rH i—I rH rH rH i-H O OO O O CO COCOCOCO COCOCOCO COCOCCCOoq oq oq oq oq oq oq oq oqoqoqoq oqoqoqoqOOOO oooo oooo oooooooo oooo oooo oooo

ua ua uacq cq cq 05CO CO CD COOOOOoooo

'C^^ rfl

05 05 05 05CO CO CO COOOOOoooo

Tf Tfi -Ttn Tin 1—t 1—

!

05 05 05 05 05 05 00 00CO CO CO CO C001>1>OOOO OOOOoooo oooo

00 00 00 00ocq cq cq COCO CO CO COoooo

ooooO O O U5oooouo uo uo uooooo

uo CO O 00cq 1-H o 00cq 00 05

cq CO uo COcq cq cq cq

O uo O 00o cq uo o1-H tr CO 0500 00 05 05

00 00 00 00ooooCO CO CO CDCO CO CO COoooo

CO CO CO ouo uo ut) UC)

uo uo uo uoUO UO uo UOOOOO

1-0 CO o CO1> CO uo COuo iH irr CO

00 o 1-H COcq CO CO CO

00 CO GO COcq uot^ ouo iH 1>. rjt

o 1-H 1—I cq

oooo 00 00ooooCO CO CO COCO CO CO COoooo

CO CO CO COuo uo uo uouo uo uo uouo uo LO uooooo

uo CO O 00cq 1-H o 0005 lO i-H CO

rf CO 00 05CO CO CO CO

00 CO 00 COcq uo oo o cq (OCO CO Tti TtH

00 00 05 05O O uo uoCO CO o oCO CO TfH ôooo

CO CO O Ouo lO uo uouo uo cq cquo uo CO COoooo

uocoool> CO LO ocq 00 00

1-H cq oThI rctH uo

00 CO 00 00cq uo 00 00uo iH CO IHuo CO CO 05

UOOLO'^ 05 rtl 05 rt* 05 -rtH 05 05 TtH

cq uo COTiH o CD cq00 05 05 0

00 iH CO CO 00 1-1 CO CO 00rHO5O5oouothi> coococq oouoouoOi-Hcqcq co'cjHrûo uocot^05

O LO o uouot>ocql> CO O CO00 05 o o

O uo O LOuo o cqcq 00 lo i-H

1-H rH cq CO

o uo o uouo i> o cqi> CO o COCO uo uo

O uo o ouo o ocq 00 uo ococoi>o

ooooo oooooooo 00 00 00 00 oooococoCqcqcq.-H rHrHrHrn rH rH rH rH rH rH iH iH

O 00 (N t>- >o 00 lO rH ^ 0 05 tr 00 to CO 00 to (05 r;}<O <M 00 CO ^r CO 0 to oq CD tr (M rJH i> 0 CO-go o o CO CO CO O CO CO o 0 rjH to 0 CD tr 0 CD tr 0

§ go oo o 05 05 o 05 05 o 0 ,(35 (05 0 05 (35 0 (35 <35 0'i-i d d o' d d d ddd OOO d od doo»0 CO (N ocot^ o CO 0 -iti (M 00 Otr tr 0 CO CO1>- O !> o lO C5 lO rH CO tr CO 0 CD to 05 to 00 CO

e •geo CO O 1> ooo ooo CO 00 05 0 OOO ooogo o o 00 05 05 o 05 05 o 05 00 00 0 05 05 0 05 (35 0CO<»

'd d d d d d d ddd d ddd ddd dddO00(N 1> lo 00 lO OQ CO 0 05 tr (30 to cq tr to 00 CO

s lO t>. t>- CO CO Tt^ (N 05 CO to 0 tr CD cq tr cq to CO-gl>.CD o tH CO o 'ct^ CO O tr (N oq 0 Tf ^ 0 rH 0goo 00 o^ . . .

00 00 00 o 00 00 o 00 00 00 0 00 00 0 00 00 0<w5«.

ooo d d d d ddd 0 ooo ooo oddIOCO(N CQ O CO O 00 Cd to rti cq 00 0 CD CD 0 cq <M(N lO 1> r-H O lO o CO CO (N GO to CD 0 'cH 0 CO CO

?£ CD •grH O O lO 00

1

> o 00 tr O rH to CD 0 00 00 0 00 00 0goo 00 o i> t^l>o 1> tr O 00 tr tr 0 tr tr 0 1> tr 0

e “^ddd d ddd ddd 0 ooo ooo dddO 00 (N i> lO 05 CO lO CO Cl 0 <05tr 00 tO 'rH CD to tr cqO <N W 00 1> CO tH 1> CO 0 to oq CD tr cq rct^ !> 0 CO

•gio TiH o 00 rH rH O rH rH O to 05 0 0 rH cq 0 rH cq 0ese

o•^ . . .

CO 1> t>- o i>o tr CDtr 0 tr tr 0 Jr J>0o ooo d ddd ddd 0 ooo d 0 d ooo

UO O O rtl CO rH reft to (05 to to rH rtl to rH rH CO <35

< 1> o o CO O CO rcfl O (N b- cq 00 CD 0 ^ 'cfH 0 CO cq-goo 00 o CO CO uo o CO lO o 00 xH T^l 0 CD CD 0 CD CD 0

fi go CO o CO CO CO o CO CO o CD CD CD 0 CD CD 0 CD CD 0^ . . . dddCJ•<ri s ooo d ddd 0 ooo odd ooo

•S 0^0 C3 05 00 T—

1

05 O 05 0 (05 0 rH 05 0 tH <35 00 <35

g •§?s

lo 00 o CO CO T^^ l> to (N to 05 CD CD tr (N tr 0 cq1=1 •g(N rH O 05 05 o 05 (05 O (N tr 00 0 05 0 0 <35 0 0goo o lO uo lo O to to o CD to to 0 to CD 0 to CD 0

no" g T)C3

^ . . .ooo d ddd ddd 0 odd ooo ood03 £

<20

;cl lO o o 'ctH TtH o -st^ CO 00 to --ttl to rH 'CtH 0 rH cq 00E-i (N O O lO rH to (N (M (N tr CO CD to 05 to 00 cq

•go lO o rH CO CO o CO CO o CD rH (rq 0 CO CO 0 CO CO 0gio o o lO lO lO o to to o to to to 0 to to 0 to to 0d d d d ddd ddd 0 ooo 0 0 d ddd

CO O 00 (N CO 00 rH 1> 00 (M CO 0 CO CD CO 00 lOl^ 00 rH CDto O CO o CO CO CO CO CO 'Ct< (N 0 rH CD to CD 0 CO CD <35 cqCO

s•go o o lO !>• !> O 1> l> o 0 CD CD 0 1X30 0 tr tr 0

CO

r2:si go O O ^ O to 'ct^ 0 Tt( 0 rH rH 0

"^d d d d ddd ddd 0 ooo 0 0 d dddc<r lO CO (N i> CO CO CO 00 to to 00 rH CO CO 05 CD CO 00 to

t> 1-1 o CO O CO rtH rH (M tr 00 to -CiH tr (^5 t3H CDCqS£ CD -geo CO o 05 rH rH O rH rH O CO 05 0 0 rH rH 0 rH rH 0e js: 85 g-^ o CO rsH 'CfH O rcH 'cfH O Tt^ CO TtH 0 0 rH rH 0>55

'o"^ddd d ddd ddd 0 0 d 0 ooo ooo

to O O tH 1> CO T^^ 1> CO rt 0 oq 00 CD tr rH 1> rH rHlO o o CO r:^^ rH 00 ^ (M (N to rH 10 rct^ rci^ 00 CO rHt^Cq

?e

?§

•glr^O O CO lO lO O to to o tr rf ^ 0 to to 0 to to 0e geo CO o CO CO CO o CO CO o CO CO CO 0 CO CO 0 CO CO 0CO

?£o

"^d d d d ddd ddd * d ooo ooo dddlO^ ^ <N <N 05 CO <N (05 CO to tr CO CD cq to CO cq to CO

CO (M lO 'chi (N 00 CO (M 05 cq (N 00 CO refH cq to CO cq rH cqCO (N

CO

•gr-l o O 05 00 o 05 00 o tr 00 0 05 05 0 <35 <35 0I

geo CO o CO <M (M O (N (N O CO cq cq 0 cq (M 0 cq cq 0d d d d ddd ddd 0 d 0 0 0 0 d ddd

<55 O O i> lO (N trio (M 0 cq 00 CD tr (33 (N Kr (35Cq?e O 'cH lO T—

1

05 CO CO 05tr (M 0 CD 0 ^ <35 cq CO <35 th cq

c^CO

•go rt^ o rH (M (M O (N (M O to rH (N 0 cq CO 0 cq CO 0§ g(N (M O CO (N (N O (N (M O (N cq cq 0 <M cq 0 cq cq 0

"^d d d d ddd ddd 0 ooo ooo ddd1

»dCO

w1-:)

1 1 1

I

1 : ! 1 11

03

WI

1 1!

1' 1

1 I

I I I

I > I

I

I

CQ

§§

^ ^ o' _J

g

o3 is4 d «rJpoW

d

s•s i4 •sS'J d « J

pq

<1

Eh

S2TJ

U

o'

'1

^ co'i:

« t3 S i

5 o.a I

- 03CO d

03

0 S^ eg

1

rC4 1

C3 1

•d '

'ft1

1

fit 1

CO 1

'h '

ftj

W

Pt

Pt

<1

H

1

CO 0

fl s

r PtCO <v

-(H

V, 0p B

1

• rH •

-dJ

xi 1

0 1

1

• ri '

ra;

rP I

0 1

s.2’w

^ o3 X! 1

TjCO

f-<

^ <1^

•M

;t

^ <1^

co-goI2;

^ 133

(M^(33

cq "Pif «

‘&pt'

d 1

ftpt' .

;t Hi Pt ILI ^ (D ^ <v

S W 03 O ' 03 O O o 03 0 03 0 <M 1;^a O 03 -r-s 1 C3 fl P to D -r-s d) D.a rn (c o3 tt

tC ft m 03 .0 03 c3 t/3 (33 Eh 03 (33 03 .9 03 d m dQ 03 ft 03 03 03 H1 a

03 P CO Pc3 B c3 S C3 Td 03 TO P C3 B (33 (33 CS3 <S

6 6 6 6 6 0 0 6

iHe

Im

IiMs

IIK

IiMs

IIH

IiKs

IIK

|nu

|IK

|i^Me

Dimensions

and

tolerances

i

'

Threads

per

inch

Screw Threads and Ta'p-Drill Sizes 41

(M

000 CO H-I CO iH Tfl rH CO 0 CO CO 0 hJH to rH ft tH COCO (35 CO CO C35 to -rf 0 CN 0 00 <05 to CO <05 CO ft

ZOgo Oi 0 (N 10 LO 0 to to 0 0 CO 0 to CO 0 to CO 0©O OJ 0 05 05 05 0 05 0-5 0 0 <05 <05 0 <05 <05 0 <05 <05 0

i-H c5 rH rH 0 rH rH 0 CN rH rH 0 rH rH 0 rH rH 0000 CO 10 <05 CO rH 0 CO 00 0 'T CO <05 ft to rH

coO rH 05 CO <05 CO LO <05 to hH 0 CN 0 00 05 to to <05 CO ft10 0 IH 000 000 to 00 <05 0 OrH 0 0 rH 0

gt-t-o CO 1> t- 0 tr-tr 0 1> CO CO 0 tr tr 0 IH l> 0th d tH rH d rH rH 0 rH rH d rH rH 0 rH rH d

10 (TO (N CO r<^( 00 CO reft to <05 10 reJH <05 to Thi 0 CO ft CO <05

ccl> 05 00 05 rH lO ^0 H I> CO J> 1> rH t-. to r-<. to COgoo 1> 0 10 r^ 0 to rrtH 0 00 CN CO 0 to to 0 to to 0

rH geo CO 0 CO CO CO 0 CO CO 0 CO CO CO 0 CO CO 0 CO CO 0^,H rH d rH rH 0 H rH 0 H rH 0 rH rH 0 rH T—t 00 00 (N 00 <05 CO CO <05 0 <05 0 <05 to (05 to CO <05 00 <05

eo »0 CO 00 CO 00 CO 10 00 to CO to TJH CN tr- 00 rcf( to 00 CN CO«(N '-H 0 10 GO 00 0 00 00 0 CN ee J> 0 00 <05 0 00 <05 0

00 geo CO 0 lO 10 10 0 to to 0 CO to to 0 to to 0 to to 01—! rH r-i 0 rH rH d rH rH d rH rH 0 rH rH d

10 CO (M CO <05 >0 rrtl to <05 to rchi <05 to <05 UO ft CO <05

ooCN 00 Tl^ CO 0 10 CO CN CO (N CN <05 t-. CO rH to CO 0 CO

00go 0 0 Oi <M <0^ 0 <M 0 CO 000 CN CO 0 CN (CO 0gio 0 0 rcfH 10 10 0 to to 0 to to to 0 to to 0 to to 0

rH d rH rH d rH* rH d rH rH rH d r-l rH 0 rH rH d0 00 (N 00 <05 -TiH lO <05 r-H 00 0 <05 t^H to <05 r<jH to <05 I>. 00

ccO rH 00 1-H CO 00 10 CO 0 CO 0 CIDt^tr- CO <05 to COt-rCO^0 05 0 CO CO to 0 CO CO 0 0 co ^ 0 CO CO 0 CO CO 0g-io "H 0 •rctH TH 0 rtH Ti^ 0 to X X 0 rcH X 0 ft ft 0'^rH rH d rH rH 0 rH rH 0 rH rH 0 rH rH d rH rH 00 CO (N CO 0 X Tf CO 00 to rT <05 to 00 T^( ft CN 00

coin 05 00 05 rH CO, to rH t> CO 1> tr rrf h- rH CO to rH to COgeo (M 0 CO 0 05 0 0 (05 0 CO tôoo 000 000gT^^ -H 0 CO hH CO 0 -cf CO 0 TjH CO CO 0 rcEl ft 0 ft ft 0

rH' d d t-H rH rH 0 H ft d rH rH d rH rH 0 rH rH 00 00 (M 00 05 to rrf 05 rH 00 0 05 Ttl to <05 CO ft <05 00

e, 10 CO 00 CO 00 CO >o 00 to CO to rT CN t^ 00 ft to 00 CN COCO 0 0 CO CO 0 CO CO 0 I> rH CN 0 CO ft 0 CO ft 0

geo CO 0 CO CO 00 0 CO CO 0 CO CO CO 0 CO CO 0 CO CO 0"^rH rH d rH rH d t-H t-H 0 rH rH d rH rH d rH rH d

10 CO (M CO ^ rH CO r<tl |H to rh <05 to ft t-co ft rH |>00 <N -H 00 CO H to CO (M CO CN CN <05 t^ CO rH to CO 0 CO2 rH 0 0 TjH IH 0 IH !>. 0 rH to to 0 00 0 hr 00 0

00 geo CO 0 (N <M <0^ 0 (M (0? 0 CO CN CN 0 CN CN 0 CN CN 0'H^ rH d rH rH 0 rH rH 0 tH rH 0 rH rH 0 rH rH 00 GO (M 00 <05 CO CO <05 <N 1> 0 <05 -T to <05 CN CO <05 CO tr

ecO r-l 00 CO 00 to CO 0 CO 0 <05 t^t^ CO <05 to CO t-r COJiO 0 00 rH 0 0 H H 0 to 00 <05 0 H rH 0 r—

1

rH 000 •gcN (N 0

c?

’-3 00 C-q 0 (N <M 0 CN H tH 0 CN CN 0 CN CN 0th' rH‘ d rH rH' d ft ft d rH rH 0 rH rH d rH rH 0>0 CO ot CO (M (M ^ 00 CO to Tj< <05 to ft CO cq ft 0 X

ccl> 05 00 05 rH CO to r—

1

iH CO I> t^ Ttl rH CO to rH to CO

00« 00 lHO 1—

1

to r^^ 0 to 0 00 CN CO 0 to to 0 to to 0grH rH O ’-' rH rH 0 rH rH 0 rH rH 0 rH rH 0 rH tH 0''-'rH rH d rH rH d rH rH d rH rH 0 rH rH 0 rH rH d0 00 (M 00 <05 l> C'J <05 CO CO 0 <05 ^ to <05 rH CN <05 to c6

cLO CO GO CO 00 CO to 00 to CO to t)h CN 1> 00 ft to 00 CN COJCN rH 0 10 00 00 0 00 00 0 CN CO tr 0 00 <05 0 00 <05 0

00 grH rH 0 0 000 000 000 000 000'^ rH rH d rH rH 0 rH 1-H 0 H rH 0 H rH 0 rH rH d

10 CO (M CO CO 00 TiH 00 CO to hH <05 to ft CN 00 ft 0 COco(N 00 rct^ CO rH r^ CO <M CO (N CN (05 CO rH ft CO 0 CO

00^00 00 0 05 (M (M 0 (N (M 0 CO 000 CN CO 0 CN CO 0goo 0e

05 000 000 0 000 000 000r-HHd CO rH rH 0 T—i rH 0 rH rH 0 rH rH 0 rH rH 0

1

'

1

1

1

'

1 1!

'M

1

H ' 1I >

ft1

1 ^ ' '

iEWSMax Min. ToL Max Max Min. ToL

S.d^ 0 .S .S .S .S gra S sgg SSh SSh

0 '^~rai - a - u 1 !

11

P '

*' f-H

1

11

1

CO 0 CO 0 B CO S CO <0

Q -H 'xi1

^ ' H ^1

701B T? ^

? g g IIrO !

0 1

1

rP 1

0 1

<1 T3 05

H p aX aS ^

rd 1

0 1

rP '

<0 1^ o3 o3 d ' -H 1 p .s<d •4^ I -H 1

S (N ^ (M Xi ft H ftn !S CN X CN X ft J 'Ph JH ai H .. <0 r <V ;h .. <0 - <0

0 $.2.

CO 00 H CO -ar

(C 0.0 CO 00

CN 'a>^ .=3 oa 2 ^ 2 o 'T o

S c3

H £5 §0S V,- o

m ojjv ®r^ S

“i g-^

' ^ St S"o .9

o^ III^ el B- ^g'S i- aO ca o o

a« o

• '4.' ^sail

S "a 2

5 â5

<i:> P S

iia-

S-a

l°^gaa V a o

2.^0 "33

c3 ^ .2 'P

a b£) w 5a 0 o

o wo <x>

t:5-P Pgô.a» 2a -a

ô:'S1©

?a-Js

to

-a-Sa^© g g+3

a5?a&'Oh g'-n £O o 0

a S “a a ^ o. oP o^ 13© ‘-< -W w %-i

©a-w ^” S^-Q 3

oo^.a§a-o

ag« §i;a^^=3© g^^'o-g,x}-^ .s a o _g ° g 1-^ a

£lial§^-S0—10 ^ a^,rt a£ =^5 a u g a o®'gM a a5"a cs ^3:0^

S®sSs5^*o c3 <>h53 ^§a2g-ilSoc3©ap^®o

Bg^-aôS'S'

ilsiSIslIII i Is-

is iil!lS‘^1|?Pls^b" .9 as5

42 Commercial Standard CS24~43

SIZES OF TAP DRILLS

11. The essential requirement of a tap drill is that the hole pro-duced by it shall be such that, when tapped with a screw thread, theminor diameter of the tapped hole shall be within the specified limits.

It should be noted that the minor diameters of the tapped holes arethe same for classes 1 to 4, inclusive.

lla. If the drill is too large, the minor diameter of the tapped holewill also be too large, and the thread in the nut will be too shallow,that is, too small a percentage of a full thread. As an extreme case,

the threads in the tapped hole will engage only the tops of the threadson a screw of correct size, and under stress the threads of the screwwill strip and the full strength of the fastening will not be developed.

llb. If, on the other hand, the tap drill is too small, the tap will beforced to cut a thread of full depth, and in the extreme case to act as

a reamer also. This will result in excessive power consumption andtap breakage, and will also make the minor diameter of the tapped holedependent upon the minor diameter of the tap. This is undesirable,

since the minor diameter of the tap is not, in general, held to the sameclose limits as the other tap elements, and as a result the minordiameter of a hole tapped under these conditions may be in error eventhough the tap is otherwise correct.

llc. It is a well-known fact that the size of the hole produced bya tap drill depends to some extent upon the method of grinding thedrill, the material drilled, the lubricant used, and the alinement,speed, and feed of operation. This being true, it is apparent thatfixing the diameter of the tap drill does not completely fix the diam-eter of the drilled hole. The most that can be accomplished is to fix

the drill diameters between certain limits and to depend upon correct

grinding, lubrication, and operation to keep the diameter of the holes

within prescribed limits.

lid. There are listed in tables 122 and 123 from Handbook H28,and in the additional tables 123 (A) through 123 (D), all drill sizes

regularly carried in stock, both English and metric, which fall betweenthe limiting dimensions of the minor diameter of the threaded hole

for the American National coarse-, fine-, extra-fine-, and the 8-, 12-,

and 16-pitch-thread series. There are several thread sizes, however,for which there are no stock drills falling within the minor diameterlimits, and for these the nearest drills outside of the maximum andminimum limits are listed in italics. If the material to be tapped is

such that there is considerable ‘‘spin-up” on minor diameter duringtapping, then the larger of the two drills listed for a given size shouldbe selected. If the material is cast iron or other material with little

or no “spin-up”, then the smaller of the two drills listed should bechosen. It will usually cut oversize by a sufficient amount to bringthe minor diameter above the minimum limit.


Table 122.

—

Sizes of tap drills

[American National coarse-thread series]

Size of

threadThreadsper inch

Minor diameter of nut

Basic Maximum i Minimum

1 64

Inch

0. 0527

Inch

0. 0623

Inch

0. 0561

2 56 . 0628 . 0737 . 0667

3 48 . 0719 . 0841 . 0764

4 40 . 0795 . 0938 . 0849

5 40 . 0925 . 1062 . 0979

6 32 . 0974 . 1145 . 1042

8 32 . 1234 . 1384 . 1302

10 24 . 1359 . 1559 . 1449

12 24 . 1619 . 1801 . 1709

20 . 1850 . 2060 . 1959

®/l6 18 . 2403 . 2630 . 2524

16 . 2938 . 3184 . 3073

14 . 3447 . 3721 . 3602

^2 13 . 4001 . 4290 . 4167

12 . 4542 . 4850 . 4723

1.45 mm.1.50 mm.1.55 mm.

#51.#50.#49.

in

#462.10 mm.

r#44I #43

]

2.30 mm.[^2 in

r#39I #38 3

1

2.60 mm.#37

Inch

0. 0571. 0591. 0610

. 0670

. 0700

. 0730

. 0781

. 0810

. 0827

. 0860

. 0890

. 0906

. 0937

. 0995

. 1015

. 1024

. 1040

. 1065

. 1094

. 1130

. 1339

. 1360

. 1378

. 1470

. 1520

. 1719

. 1730

. 1770

. 1800

. 1960

. 1990

. 2031

. 2570

. 2610

. 3125

. 3160

. 3680

. 4219

. 4844

1 Present Army Ordnance practice follows Handbook H25 and the mimeographed Supplementbook H28 in the maximum minor diameters of nuts.

* See footnote at end of table 123 (D).

Stock drills corresponding to 100 percent to 50percent of basic thread depth

Nominal size

3.40 mm.#293.50 mm.

/#26.

l#24.

DiameterPercentageof depth of

basic thread

786859

826956

776760

80716656

79727065

787062

746965

7970

82797267

837972

7771

7773

75

78

72

to Hand-

44 Commercial Standard 082^-43

Table 122.—Sizes of tap drills—Continued

[American National coarse-thread series]

Size of

thread

1

1/8

1/

P/s

1/2

P/4

2/

2/2

23/4

3/

3/

3/

Threadsper inch

11

10

9

8

7

7

6

6

4/

4/2


Basic

Inch

. 5069

. 6201

. 7307

. 8376

. 9394

1. 0644

1. 1585

1. 2835

1. 4902

1. 7113

1. 9613

2. 1752

2. 4252

2. 6752

2. 9252

3. 1752

3. 4252

Maximum

Inch

. 5397

. 6553

. 7689

. 8795

. 9858

1. 1108

1. 2126

1. 3376

1. 5551

1. 7835

2. 0335

2. 2564

2. 5064

2. 7564

3. 0064

3. 2564

3. 5064

Minimum

Inch

. 5266

. 6417

. 7547

. 8647

. 9704

1. 0954

1. 1946

1. 3196

1. 5335

1. 7594

2. 0094

2. 2294

2. 4794

2. 7294

2. 9794

3. 2294

3. 4794

Stock drills corresponding to 100 percent to 50percent of basic thread depth

Nominal size DiameterPercentageof depth ofbasic thread

- _ _

Inch

. 5312 79/3.5 mm. _ . 5315 79

16.5 mm . 6496 77

^^64 in . 7656 76/9.5 mm _ _ . 7677 74

^22 mm _ . 8661 82in . 8750 77

"25 mm . 9842 76Oi

a 1 1 1 1 1 1 1 1 . 9844 76

'28 mm 1. 1024 80/%4 in__ 1. 1094 76

^30.5 mm 1 . 2008 80/i^4in _ 1. 2031 79

P >44 in _ __ 1. 3281 79

39 mm 1. 5354 83P/64 in 1. 5469 7839.5 mm _ 1. 5551 75

P/64 in 1. 7656 8145 mm _ _ _ 1. 7716 79,12^32 in 1. 7812 76

2)44 in 2. 0156 8151.5 mm 2 . 0276 772)^2 in _ 2. 0312 76

21/64 in 2. 2344 8257 mm 2. 2441 792/4 in 2. 2500 77

'63 mm 2. 4803 8323)44 in ___ _ 2. 4844 8263.5 mm 2. 5000 77,2)4 in_ .. 2. 5000 77

'2^/64 in 2. 7344 8269.5 mm_ _ _ 2. 7362 812/ in __ _ __ 2. 7500 7770 mm 2. 7559 75

26/64 in 2. 9844 8276 mm _ _ 2. 9921 793 3. 0000 77

3)4 in 3. 2500 77

3/2 in 3. 5000 77


Table 123.—Sizes of tap drills

[American National fine-thread series] i

Size ofthread

0_.

1-.

2._

3._

4_-

5..

6-_

8-.

10_.

12. _

4̂-

Hef-

Threadsper inch

80

72

64

56

48

44

40

36

32

28

28

24

24


Basic

Inch

0. 0438

. 0550

. 0657

. 0758

.0849

. 0955

. 1055

. 1279

. 1494

. 1696

. 2036

. 2584

. 3209

Maximum 2

Inch

0. 0514

. 0634

. 0746

. 0856

. 0960

. 1068

. 1179

. 1402

. 1624

. 1835

. 2173

. 2739

. 3364

Minimum

Inch

0. 0465

. 0580

. 0691

. 0797

.0894

. 1004

. 1109

. 1339

. 1562

. 1773

. 2113

.2674

. 3299

stock drills corresponding to 100 percent to 50percent of basic thread depth

Nominal size

/%4 in

\l.25 mm.

ri.50 mm.1 1.55 mm.

/#50.

l#49-

#462.10 mm.#44

2.30 mm.^2 in

#41

2.60 mm.#37#36

/#33.

t#32.

r3.40 mm.#293.50 mm.Mi in

'Yz2 in.

#215 _

#20__J19__

r#15^4.70 mm #13.

[Yie in

#3.

in.

DiameterPercentageof depth ofbasic thread

Inch

0. 0469 81. 0492 67

. 0591 77

. 0610 67

. 0700 79

. 0730 64

. 0810 78

. 0827 70

. 0860 56

. 0906 79

. 0937 68

. 0960 59

. 1024 77

. 1040 71

. 1065 63

. 1130 77

. 1160 68

. 1339 83

. 1360 78

. 1378 73

. 1406 65

. 1562 83

. 1590 76

. 1610 71

. 1660 59

. 1800 78

. 1850 67

. 1875 61

.2130 80

. 2656 87

. 2720 75

. 3320 791 Drill sizes up to inch are in agreement with ASA B5.12—1940, Twist Drills, Straight Shank, published

by the ASME, 29 West 39th Street, New York, N. Y.2 Present Army Ordnance practice follows NBS Handbook H25 and the mimeographed Supplement to

Handbook H28 in the maximum minor diameters of nuts.* See footnote at end of table 123 (D).

46 Commercial Standard CS24~4S

Table 123.—Sizes of tap drills—Continued

[American National fine-thread series]

Size of

thread

Minor diameter of nut Stock drills corresponding to 100 percent to 50percent of basic thread depth

per inch

Basic Maximum Minimum Nominal size DiameterPercentageof depth ofbasic thread

Ke- 20

Inch

0. 3725

Inch

0. 3906

Inch

0. 3834/W12^4 in

Inch

0. 3860. 3906

7972

20 . 4350 . 4531 . 4459 2^4 in __ . 4531 72

%&-- 18 . 4903 . 5100 . 5024 0.5062 . 5062 78

%- 18 . 5528 . 5725 . 5649 14.5 mm_ . 5709 75

%- 16 . 6688 . 6903 . 6823/i/ie in

\17.5 mm. 6875. 6890

7775

Vb- 14 . 7822 . 8062 . 7977in . 7969 84

\20.5 mm . 8071 73

l__ 14 . 9072 . 9312 . 9227 23.5 mm _ _ . 9252 81

IYb-

iM-

12 1. 0167 1. 0438 1. 0348 26.5 mm 1. 0433 75

12 1. 1417 1. 1688 1. 1598 29.5 mm 1. 1614 -82

1^8- 12 1. 2667 1. 2938 1. 2848 J%2 in ___\i%4 in

1. 28121. 2969

872

1/2 - 12 1. 3917 1. 4188 1. 4098 36 mm _ _ 1. 4173 76


Table 123 (A).—Sizes of tap drills

[American National 8-pitch-thread series]


Size of

threadThreadsper in.

Basic Maximum 1 Minimum

1 8Inch

0. 8376Inch

0. 8795Inch

0. 8647

m 8 . 9626 1. 0045 . 9897

8 1. 0876 1. 1295 1. 1147

irs 8 1. 2126 1. 2545 1. 2397

1/2 8 1. 3376 1. 3795 1. 3647

1/8 8 1. 4626 1. 5045 1. 4897

1^4 8 1. 5876 1. 6295 1. 6147

' l/s 8 1. 7126 1. 7545 1. 7397

2 8 1. 8376 1. 8795 1. 8647

2/8 8 1. 9626 2. 0045 1. 9897

. 2/ 8 2.0876 2. 1295 2. 1147

2/2 8 2. 3376 2. 3795 2. 3647

2% 8 2. 5876 2. 6295 2. 6147

3 8 2. 8376 2. 8795 2. 8647

3/ 8 3. 0876 3. 1295 3. 1147

3/2 8 3. 3376 3. 3795 3. 3647

Stock drills and corresponding percentage ofbasic thread depth

Nominal size Diameter

Percentageof depth of

basicthread

r22 mm.L>8 in__.

n in

\25.5 mm.

/28.5 mm.tl>8 m___

/31.5 mm.\iy, in

fiysin..\35 mm.

38 mm.IK in-.

1^8 in

in

\44.5 mm.

/47.5 mm.\1% in___

2 in.

(2ys in_.

154 mm.

/66.5 mm.12^8 in___

/73 mm.I2,%in_.

3/8 in.

3/ in.

Inch

0.

8661. 8750

1.

0000

1.

0039

1. 12201. 1250

1. 24021. 2500

1. 37501. 3780

1. 49611. 5000

1. 6250

1. 75001. 7520

1. 87011. 8750

2. 0000

2.

12502. 1260

2. 3750

2. 61812. 6250

2. 87402. 8750

3. 1250

3.

3750

8277

7775

7977

8377

7775

7977

77

7776

8077

77

7776

77

8177

7877

77

77

1 Present Army Ordnance practice follows Handbook H25 and the mimeographed Supplement to Hand-book H28 in the maximum minor diameters of nuts.

48 Commercial Standard CS24-4^

Table 123 (B).

—

Sizes of tap drills

[American National 12-pitch thread series]

Size of

thread

K

^16—-

%

1

IMe--

1/8-—iKe--

1M-—1 1̂6--

r/i6--

Threadsper in.

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12


Inch

0. 3917

. 4542

. 5167

. 5792

. 6417

. 7042

. 7667

. 8292

. 8917

. 9542

1. 0167

1. 0792

1. 1417

1. 2042

1. 2667

1.'3292

Maximum

Inch

0. 4225

. 4850

. 5438

. 6063

. 6688

. 7313

. 7938

. 8563

. 9188

. 9813

1. 0438

1. 1063

1. 1688

1. 2313

1. 2938

1. 3563

9132 in

11132 in-...

\34-5 mm> Sizes in italics are not within the specified limits for minor diameter of nut.3 See footnote at end of table 123 (D).

Minimum

Inch

0. 4098

. 4723

. 5348

. 5973

. 6598

. 7223

. 7848

. 8473

9098

. 9723

1. 0348

1. 0973

1. 1598

1. 2223

1. 2848

1. 3473

Stock drills and corresponding percentage ofbasic thread depth i

Nominal size

Z310.5 mm 3

27/64 in

/12 mm3.131/64 in.

{13.5 mm.\35I64 in.

f19132 in.

[39164 in.

(21/32 in.

[17 mm. .

18.5 mm.

20 mm_-

(21.5 mm.[55/64 in.

(29/32 in.

[59/64 in.

[25 mm..

26.5 mm.

28 mm_-

29.5 mm.

(31 mm\1 15/64 in.

9/32 in..

19/64 in.

Diameter

Inch

0. 4130. 4134. 4219

. 4724

. 4844

.5315

. 5469

. 5938

. 6094

. 6562

. 6693

. 7283

. 7874

. 8465

. 8594

. 9062

. 9219

. 9687

. 9843

1. 0433

1. 1024

1. 1614

1. 22051. 2344

1. 28121. 2969

1. 34381. 3583


basicthread

808072

8372

86

8772

8775

78

81

8472

8772

8772

75

79

82

8572

8772

8773


Table 123 (B).^

—

-Sizes, of tap drills—Continued

[American National ] 2-pitch thread series]


Size of

threadThreadsper in.

Basic Maximum Minimum

IK2-— 12Inch

1. 3917Inch

1. 4188Inch

1. 4098

1%_— 12 1. 5167 1. 5438 1. 5348

1%-— 12 1. 6417 1. 6688 1. 6598

1^8—- 12 1. 7667 1. 7938 1. 7848

2 12 1. 8917 1. 9188 1. 9098

2/8-— 12 2. 0167 2. 0438 2. 0348

2/4— 12 2. 1417 2. 1688 2. 1598

2/8— 12 2. 2667 2. 2938 2. 2848

2/2— 12 2. 3917 2. 4188 2. 4098

2/8— 12 2. 5167 2. 5438 2. 5348

2/_-._ 12 2. 6417 2. 6688 2. 6598

2/8—

_

12 2. 7667 2. 7938 2. 7848

3 12 2. 8917 2. 9188 2. 9098

111CO 12 3. 0167 3. 0438 3. 0348

11CO 12 3. 1417 3. 1688 3. 1598

3^8-— 12 3. 2667 3. 2938 3. 2848

12 3. 3917 3. 4188 3. 4098

Stock drills and corresponding percentage ofbasic thread depth i



basicthread

36 mm_Inch

1. 4173 76

39 mm__ _ _ 1. 5354 83

(1 21132 in 1. 6562 87in 1. 6719 72

45.5 mm 1. 7913 77

(48.5 mm _ __ 1. 9094 84\l 59164 in 1. 9219 72

j2 1132 in . 2. 0312 87{2 3164 in 2. 0469 72

55 mm _ _ _ 2. 1654 78

(58 mm 2. 2835 85\2 19164 in 2. 2969 72

(2 13132 in 2. 4062 87{61.5 mm 2. 4213 73

64.5 mm 2. 5394 79

(67.5 mm __ 2. 6575 85[2 4^ld4 in 2. 6719 72

(2 25132 in 2. 7812 87{71 mm__ 2. 7953 74

74 mm__ _ 2. 9134 80

(3 1132 in 3. 0312 87{3 1116 in 3. 0625 58

(3 5132 in... 3. 1562 873116 in 3. 1875 58

(3 9132 in.. .. 3. 2812 875/16 in 3. 3125 58

3 7116 in 3. 4375 58

1 Sizes in italics are not within the specified limits for minor diameter of nut.

50 Commercial Standard 0824-43

Table 123 (C).—Sizes of tap drills

[American National 16-pitch-thread, series]


Size of

threadThreads per

inch

Basic Maximum i Minimum

^4 16

Inch

0. 6688

Inch

0. 6903

Inch

0. 6823

1^6--- 16 . 7313 . 7528 . 7448

16 . 7938 . 8153 . 8073

'Me--- 16 . 8563 . 8778 . 8698

1 16 . 9188 . 9403 . 9323

iKe-- 16 . 9813 1. 0028 . 9948

1%—- 16 1. 0438 1. 0653 1. 0573

IMe-- 16 1. 1063 1. 1278 1. 1198

IK—

-

16 1. 1688 1. 1903 1. 1823

iMe-- 16 1. 2313 1. 2528 1. 2448

IM—

-

16 1. 2938 1. 3153 1. 3073

iKe-- 16 1. 3563 1. 3778 1. 3698

l}i—- 16 1. 4188 1. 4403 1. 4323

iMe 16 1. 4813 L 5028 1. 4948

iM—

-

16 1. 5438 1. 5653 1. 5573

I'Ke— 16 1. 6063 1. 6278 1. 6198

1%.— 16 1. 6688 1. 6903 1. 6823

I'Me— 16 1. 7313 1. 7528 1. 7448



Percentageof depthof basicthread

11/16 m.

17.5 mm.

'19 mm__f/iin

1^6 in___

Ys in

1 in.

iKe in-

27 mm.

/28.5 mm.\l}i in___

iKo in.

1>^ in..

iMe in.

Ws in_.

/36.5 mm.11^6 in...

38 mm.VA in

1%6 in..

lYs in__

l^Ke in.

in

44.5 mm.

Inch

0. 6875. 6890

. 7480

. 7500

. 8125

. 8750

. 9375

1. 0000

1. 06251. 0630

1 . 12201. 1250

1. 1875

1. 2500

1. 3125

1. 3750

1. 43701. 4375

1. 49611. 5000

1. 5625

1. 6250

1. 6875

1. 75001. 7520

7775

7977

77

77

77

77

7776

8177

77

77

77

77

7877

8277

77

77

77

7775

'' 1 Present Army ordnance practice follows Handbook H25 and the mimeographed Supplement to Hand-book H28 in the maximum minor diameters of nuts.


Table 123 (C).—Sizes of tap drills—Continued

[American National 16-pitch-thread series]


Size of

thread

2

2M6--

2H—

-

2^6--

2M____

2Hg--

23/8____

2^6--

2/2--

2 ^8—

2K—

-

2%—

-

3

3>1__-

33/8___.

3H-__-

Threadsper in.

16

16

16

16

16

16

16

16

16

16

16

16

16

16

16

16

16

16

16

Basic

Inch

1. 7938

1. 8563

1. 9188

1. 9813

2. 0438

2. 1063

2. 1688

2. 2313

2. 2938

2. 3563

2. 4188

2. 5438

2. 6688

2. 7938

2. 9188

3. 0438

3. 1688

3. 2938

3. 4188

Maximum

Inch

1. 8153

1. 8778

1. 9403

2. 0028

2. 0653

2. 1278

2. 1903

2. 2528

2. 3153

2. 3778

2. 4403

2. 5653

2. 6903

2. 8153

2. 9403

3. 0653

3. 1903

3. 3153

3. 4403

Minimum

Inch

1. 8073

1. 8698

1. 9323

1. 9948

2. 0573

2. 1198

2. 1823

2. 2448

2. 3073

•2. 3698

2. 4323

2. 5573

2. 6823

2. 8073

2. 9323

3. 0573

3. 1823

3. 3073

3. 4323




basicthread

[46 mmInch

1. 8110 79[11^6 in_ _ - 1. 8125 77

/47.5 mm 1. 8701 8311% in 1. 8750 77

li%6 in_ 1. 9375 77

2 in_ _ 2. 0000 77

2H6 in 2. 0625 77

12% in . 2. 1250 77[54 mm 2. 1260 76

/55.5 mm12%6 in_

2. 1850 802. 1875 77

2% in 2. 2500 77

11111111O(M 2. 3125 77

2% in 2. 3750 77

2%6 in 2. 4375 77

/65 mm 2. 5590 81\2M6 in _ 2. 5625 77

21M6 in 2. 6875 77

r2’%6 in_ __ 2. 8125 77[71. 5 mm 2. 8150 74

/74.5 mm 2. 9331 82I2yi6 in 2. 9375 77

3Me in 3. 0625 77

3M6 in 3. 1875 77

111111110COCO 3. 3125 77

3M6 in_ 3. 4375 77

52 Commercial Standard CSB4~4S

Table 123 (D).—Sizes of tap drills

[American National extra-fine-thread series]

Size of


<

Minor diameter of nut‘

Basic Maximum 2 Mtuimum

Inch Inch Inchr

K 32 0. 2094 0. 2208 0.2162 <

Me-— 32 .2719 . 2833 .27871

K 32 . 3344 . 3458 .34121

28 . 3911 . 4041 .39881

11111 28 . 4536 . 4666 .46131

®/l6—

-

24 . 5084 . 5235 .51741

H 24 . 5709 . 5860 .57991

24 . 6334 . 6485 . 64241

K 20 . 6850 . 7027 . 6959{

'Me-— 20 . 7475 . 7652 . 75841

% 20 . 8100 . 8277 . 8209

^^6— 20 . 8725 . 8902 . 8834

1 20 . 9350 . 9527 . 94591

IMe-- 18 9903 1. 0099 1. 0024

1%.... 18 1. 0528 1. 0724 1. 06491

1^16-- 18 1. 1153 1. 1349 1. 12741

1/4-— 18 1. 1778 1. 1974 1. 18991

basic thread depth J

Nominal size

'5.5 mm.®.%2 in

,5.6 mm,®.

'7.1 mm.®.K®

'8.7 mm.®.!^2 in___

.8.75 mm.®

“764 t'll'-

.^Vz 2 in.

in.

%2 in.

'^}U in.

J5 mm.

in._.

J6.5 mm.

'17.5 mm.in...

'% in.49.U in.

21 mm__

22.5 mm.

''24 mm.,in

25.5 mm.

lYie, in...

30.5 mm.

Diameter

Inch

0. 2165. 2188. 2205

. 2795

. 2810

. 2812

. 3425

. 3438

. 3445

. 3970

. 4040

. 4531

. 4687

. 5156

. 5312

. 5781

. 5906

. 6406

. 6496

. 6890

. 7031

. 7500

. 7656

. 8268

. 8858

.9449

. 9531

1. 0040

1. 06301. 0781

1. 1250.1. 1406

1. 18751. 2008


thread

837773

817777

807775

8772

10167

8758

8764

8770

9472

9672

74

80

8572

81

8665

8765

8768

' Sizes in italics are not within the specified limits for minor diameter of nut.2 Present Army ordnance practice follows Handbook H25 and the mimeographed Supplement to Hand-

book H28 in the maximum minor diameters of nuts.3 These sizes are not included as standard in American Standard B 6.12-1940 for Twist Drills, Straight

Shank, but are listed in the appendix thereto.


Table 123 (D).—Sizes of tap drills—Continued

[American National extra-fine-thread series]

Size of


Minor diameter of nutStock drills and correspondiag percentage of

basic thread depth

Basic Maximum Minimum Nominal size Diameter


basicthread

Inch Inch Inch Inch

1^6— 18 1. 2403 1. 2599 1. 2524 32 mm 1. 2598 73

1%-— 18 1. 3028 1. 3224 1. 3149 33.5 mm 1. 3189 78

iVie— 18 1. 3653 1. 3849 1. 3774 35 mm_ _ _ 1. 3780 82

m—. 18 1. 4278 1. 4474 1. 4399 jV/i& in __ 1. 4375 87in _ _ _ 1. 4531 65

IflO— 18 1. 4903 1. 5099 1. 5024 [lytin __ 1. 5000 87in 1. 5156 65

1%.— 18 1. 5528 1. 5724 1. 5649 (lYie in _ 1. 5625 87\40 mm 1. 5748 70

VVie- 18 1. 6153 1. 6349 1. 6274 41.5 mm 1. 6339 74

D4-— 16 1. 6688 1. 6903'

1. 6823 DKe in 1. 6875 77

2 16 1. 9188 1. 9403 1. 9323 D%6 in 1. 9375 77

LABELING

12. Where the dimensions are to be guaranteed, the following formof statement on labels, invoices, catalogues, etc., is recommended:

The guarantees that for the respec-Company

tive classes of fit as identified or labeled, these screw threads conformto Commercial Standard CS24-43 as issued by the National Bureauof Standards of the U. S. Department of Commerce.

EFFECTIVE DATEThe standard is effective for new production from February 10,

1943.

STANDING COMMITTEEThe following individuals comprise the membership of the standing

committee, which is to review, prior to circulation for acceptance,revisions proposed to keep the standard abreast of progress. Mostorganizations nominated their own representatives. Comment con-cerning the standard and suggestions for revision may be addressedto any member of the committee or to the Division of Trade Standards,National Bureau of Standards, which acts as secretary for the com-mittee.

Manufacturers: '

^

Carl W. Bettcher (Chairman), Eastern Machine Screw Corporation, NewHaven, Conn.

J. J. Tomalis, American Screw Co., 21 Stevens Street, Providence, R. I.


George S. Case, Lamson & Sessions Co., 1975 W. 85tli Street, Cleveland, Ohio-J. S. Davey, Russell, Burdsall & Ward Bolt & Nut Co., Port Chester, N. Y.J. H. Edmonds, Lebanon Plant, Bethlehem Steel Co., Lebanon, Pa.H. C. Erdman, National Screw & Mfg. Co., 2440 E. 75th St., Cleveland, OhioW. C. Stewart, American Institute, Bolt, Nut and Rivet Mfrs., 1550 Hanna

Bldg., Cleveland, Ohio,F. P. Tisch, Pheoll Mfg. Co., 5700 Roosevelt Road, Chicago, lU.

Charles C. Winter, Winter Bros. Co., Wrentham, Mass.

Distributors:

G. Cheston Caret, Carey Machinery & Supply Co., 119 E. Lombard Street’

Baltimore, Md.H. H. Smith, Strong, Carlisle & Hammond Co., 1392 W. 3d Street, Cleveland,

Ohio.

Consumers:

W. B, Barth, General Motors Corporation, Standards Section, 15-158 GeneralMotors Bldg., Detroit, Mich.

Lt. Col. Harry B. Hambleton, Office of Chief of Ordnance, War Department,Washington, D. C.

A. M. Houser, Crane Company, 836 S. Michigan Ave., Chicago, 111.

L. A. Wenn, International Business Machines Co., North Street, Endicott, N. Y.H. W. Samson, Standards Department, General Electric Co., Schenectady, N. Y.Lt. Comdr. J. W. Huckert, USN, Naval Gun Factory, U. S. Navy Yard,

Washington, D. C.

Laboratories:

H. W. Bearce, Interdepartmental Screw Thread Committee, National Bureauof Standards, Washington, D. C.

Earle Buckingham, Massachusetts Institute of Technology, Cambridge, Mass.

HISTORY OF PROJECT

In the United States the standardization of screw threads was begunwith the appointment of a special committee by the Franklin Institute

on April 21, 1861, for the investigation of a proper system of screwthreads, bolt heads, and nuts. From this beginning there was devel-

oped a system variously known as the Franklin Institute thread, theSellers thread, or the United States thread. Later a system havingfiner pitches was recommended by the Society of Automotive Engi-neers, and a machine-screw-thread series providing smaller sizes of

screws than the United States series was recommended by the Ameri-can Society of Mechanical Engineers.On July 18, 1918, the Congress authorized the appointment of the

National Screw Thread Commission, consisting of nine members, to“ascertain and establish standards for screw threads” which when“accepted and approved shall be adopted and used in the several

manufacturing plants under the control of the War and Navy Depart-ments, and, so far as practicable, in all specifications for screw threadsin proposals for manufactured articles, parts, or materials to be usedunder the direction of these departments.” The National ScrewThread Commission issued printed reports in 1921, 1924, 1928, and1933, based upon a long series of hearings and investigations both in

the United States and abroad.While the recommendations of the NSTC are mandatory upon the

War and Navy Departments, and, as far as practicable, apply also to

purchases by all Government departments, it seemed desirable to

determine the extent to which these standards were being appliedwithin the industries concerned. Accordingly, on May 8, 1929, the


National Screw Thread Commission requested the cooperation of the

National Bureau of Standards to determine the extent of adoptionand use of the NSTC recommendations in industry.

|i The hearing of the NSTC having performed all the essential func-

! tions of the general conferences normally required as a part of the

Iprocedure leading to the establishment of commercial standards, andthe recommendations of the NSTC having attained national recogni-

tion and a large following, it seemed logical to proceed directly withthe circulation of the essential screw-thread tables and tolerances to

industry for written acceptance. This was done and resulted in theimpressive roster of organizations, listed on page V of CS24-30 andCS25-30, which indicated in v/riting their intention of making the

Si American National Standard Screw Threads, as set forth in CS24-30and CS25-30, their standard oh practice, effective from July 1, 1930.

First revision and consolidation .—On March 25, 1942, the Inter-

departmental Screw Thread Committee,® recognizing that the Com-i mercial Standards CS24-30 and CS25-30 had been rendered obsolete

by revisions since their publication, requested the development of

,,revised and additional standards in line with the generally accepted

j

commercial practice recorded in National Bureau of Standards

ii;:Handbook H28.The National Bureau of Standards established a standing com-

! mittee representing manufacturers, distributors, consumers, and labo-

ratories, which reviewed, revised, and approved for circulation within' the industry the Recommended Commercial Standard for Screwj Threads and Tap Drill Sizes prepared by the Bureau.

Upon written acceptance by a predominant majority of users,

i!distributors, and producers, as listed herein, announcement was madeon November 10, 1942, that the standard would become effective for

ii new production from February 10, 1943.

5 The National Screw Thread Commission was abolished by Executive Order dated June 10, 1933. TheInterdepartmental Screw Thread Committee was established September 14, 1939, by the Departments ofWar, Navy, and Commerce to promote uniformity in screw-thread standards in the Departments concerned.

(Cut

on

this

line.)

CS24-43

ACCEPTANCE OF COMMERCIAL STANDARDIf acceptance has not previously been filed, this sheet properly filled in, signed

and returned will provide for the recording of your organization as an acceptorof this commercial standard.

DateDivision of Trade Standards, '

National Bureau of Standards,Washington, D. C.

Gentlemen:

Having considered the statements on the reverse side of this sheet,

we accept the Commercial Standard CS24-43 as our standard of

practice in the

Production ^ Distribution ^ Use ^ Testing ^

of screw threads and tap-drill sizes.

We mil assist in securing its general recognition and use, and will

cooperate with the standing committee to effect revisions of thestandard when necessary.

Signature of individual officer(in ink)

(Kindly typewrite or print the following lines)

Name and title of above officer

Organization(Fill in exactly as it should be listed)

Street address

City and State

1 Please designate which group you represent by drawing lines through the other three. Please file sep-arate acceptances for all subsidiary companies and aflSliates which should be listed separately as acceptors.In the case of related interests, trade papers, colleges, etc., desiring to record their general approval, thewords “in principle” should be added after the signature.

57

!

TO THE ACCEPTOR

The following statements answer the usual questions arising in con-nection with the acceptance and its significance:

1. Enforcement.—Commercial standards are commodity specifica-

tions voluntarily established by mutual consent of those concerned.They present a common basis of understanding betw^een the producer,distributor, and consumer and should not be confused with any planof governmental regulation or control. The United States Depart- ,

ment of Commerce has no regulatory power in the enforcement of

their provisions, but since they represent the will of the interested

groups as a whole, their provisions through usage soon become estab-

lished as trade customs, and are made effective through incorporationinto sales contracts by means of labels, invoices and the like.

2. The acceptor’s responsibility .—The purpose of commercial stand-ards is to establish for specific commodities, nationally recognizedgrades or consumer criteria and the benefits therefrom will be measure-able in direct proportion to their general recognition and actual use.

Instances will occur when it may be necessary to deviate from thestandard and the signing of an acceptance does not preclude such de-partures

;however, such signature indicates an intention to follow the

commercial standard where practicable, in the production, distribu-

tion, or consumption of the article in question.

3. The Department’s responsibility.—The major function performedby the Department of Commerce in the voluntary establishment of

commercial standards on a Nation-wide basis is fourfold: first, to act

as an unbiased coordinator to bring all interested parties together for

the mutually satisfactory adjustment of trade standards; second, to

supply such assistance and advice as past experience with similar pro-

grams may suggest; third, to canvass and record the extent of accept-|

ance and adherence to the standard on the part of producers, distrib-j

utors, and users; and fourth, after acceptance, to publish and promul-gate the standard for the information and guidance of buyers andsellers of the commodity. *

4. Announcement and promulgation.—When the standard has beenj

endorsed by a satisfactory majority of production or consumption in

the absence of active, valid opposition, the success of the project is'

announced. If, however, in the opinion of the standing committee or i

the Department of Commerce, the support of any standard is inade- i

quate, the right is reserved to withhold promulgation and publication.

58

ACCEPTORSCS24-43

The organizations and individuals listed below have accepted these

dimensions as their standard of practice in the production, distribution,

and use of screw threads and tap-drill sizes. Such endorsement does

not signify that they may not find it necessary to deviate from the

standard, nor that producers so listed guarantee ail of their products

in this field to conform with the requirements of this standard.

Therefore specific evidence of conformity should be obtained whererequired.

ASSOCIATIONS

Allied Building Metal Industries, NewYork, N. Y.

American Association of Engineers,Chicago, 111.

American Institute of Bolt, Nut, &Rivet Manufacturers, Cleveland,Ohio.

American Railway Engineering Associ-ation, Chicago, 111. (In Principle.)

American Supply & Machinery Manu-facturers’ Association, Inc., Pitts-

burgh, Pa. (In Principle.)

Associated General Contractors of

America, Inc., Washington, D. C.Manufacturers Standardization Society

of the Valve & Fittings Industry,New York, N. Y.

National Association Master Plumbers,New York, N. Y.

National Retail Hardware Association,Indianapolis, Ind.

National Screw Machine Products As-sociation, Cleveland, Ohio.

Southern Hardware Jobbers Associ-ation, Atlanta, Ga.

Southern Supply & Machinery Dis-tributors’ Association, Inc., Atlanta,Ga.

FIRMS

Accurate Tool Co., Detroit, Mich.Acme Machine Tool Co., The, Cincin-

nati, Ohio.Adams Co., The, Dubuque, Iowa.Aero Supply Manufacturing Co., Inc.,

Corry, Pa.Aircooled Motors Corporation, Syra-

cuse, N. Y.Ajax Bolt & Screw Co., Detroit, Mich.Allen Manufacturing Co., The, Hart-

ford, Conn.Almond Manufacturing Co., T. R.,Ashburnham, Mass.

Aluminum & Brass Co., Lockport;N. Y.

Aluminum Company of America, Pitts-

burgh, Pa.American Bridge Co., Pittsburgh, Pa.American Locomotive Co., Schenec-

tady, N. Y.American Manganese Bronze Co.,Holmesburg, Philadelphia, Pa.

American Seating Co., Grand Rapids,Mich.

American Screw Co., Providence, R. I.

Armstrong Manufacturing Co., The,Bridgeport, Conn.

Arrow Automatic Products Corpo-ration, New York, N. Y.

Atlantic Machine Screw Co., S. Boston,IVTS/SS

Atlas Bolt & Screw Co., The, Cleve-land, Ohio.

Atlas Copper & Brass ManufacturingCo., Chicago, 111.

Autocar Co., Ardmore, Pa.Automatic Machinery Manufacturing

Corporation, Bridgeport, Conn.Automatic Products Co., Milwaukee,

Wis.Autoscrew Co., New York, N. Y.Avey Drilling Machine Co., The, Cov-

ington.Babson-Dow Manufacturing Co., Rox-

bury, (Boston) Mass.Baldwin Locomotive Works, The, Phila-

delphia, Pa.Bard Manufacturing Co., Royersford,

Pa.Bath & Co., John, Worcester, Mass.Bausch & Lomb Optical Co., Rochester,

N. Y.Bausch Machine Tool Co., Springfield,

Mass.Bayonne Bolt Corporation, Bayonne,

N. J.

Beard Tool Co., L. O., Lancaster, Pa.

59

60 Commercial Standard CS24-Jf3

Bell Go., Inc., The David, Buffalo,

N. Y.Bethlehem Steel Co., Lebanon, Pa.Bicknell Manufacturing Co., Rockland,Maine

Biglow & Co., Inc., L. C., New York,N. Y.

Billings & Spencer Co., The, Hartford,Conn.

Bommer Spring Hinge Co., Brooklyn,N. Y.

Boston Machine Works Co., Lynn,Mass.

Botwinik Brothers, Inc., Hamden, NewHaven, Conn.

Brightman Nut & Manufacturing Co.,Sandusky, Ohio.

Brill Co., The J. G., Philadelphia, Pa.Brown Bag Filling Machine Co., The,

Fitchburg, Mass!Brown & Sharpe Manufacturing Co.,

Providence, R. I.

Brown-Wales Co., Boston, Mass.Buckeye Traction Ditcher Co., The,

Findlay, Ohio.Buda Co., The, Harvey, 111.

Buerk Tool Works, Buffalo, N. Y.Buffalo Bolt Co., North Tonawanda,

N. Y.Camden Forge Co., Camden, N. J.

Cap Screw & Nut Co. of America, Inc.,

New York, N. Y.Carey Machinery & Supply Co., Balti-

more, Md.Central Screw Co., Chicago, 111.

Chain Belt Co., Milwaukee, Wis.Chatillon & Sons, John, New York,

N. Y.Chicago, Rock Island & Pacific Railway

Co., Chicago, 111.

Chicago Screw Co., The, Chicago, 111.

Chrysler Corporation, Detroit, Mich.Cincinnati Planer Co., The, Cincinnati,

Ohio.City Engineering Co., The, Dayton,

Ohio.Clark, Jas., Jr., Paterson, N. J.

Clark Bros. Bolt Co., Milldale, Conn.Clark Metal Products, Inc., Bridgeport,

Conn.Clendenin Bros. Inc., Baltimore, Md.Cleveland Automatic Machine Co.,

The, Cleveland, Ohio.Cleveland Cap Screw Co., The, Cleve-

land, Ohio.Cleveland Die & Manufacturing Co.,

The, Cleveland, Ohio.Columbus Bolt Works Co., The, Colum-

bus, Ohio.Commonwealth Brass Corporation,

Detroit, Mich.Comtor Co., The, Waltham, MasslConnecticut Tool & Engineering Co.,

Bridgeport, Conn.Continental Screw Co., New Bedford,

EtSS

Cox & Sons Co., The, Bridgeton, N. J.

Crane Co., Chicago, 111.

Curtis Screw Co., Inc., Buffalo, N. Y.Dallett Co., The, Philadelphia, Pa.Dardelet Threadlock Corporation, De-

troit, Mich.Davis & Hemphill, Elkridge, Md.Defiance Machine Works, Inc., Defi-

ance, Ohio.Detroit Nut Co., Inc., Detroit, Mich.Detroit Plating Industries, Detroit,

Mich.Detroit Tap & Tool Co., Detroit, Mich.Doehler Die Casting Co., Batavia, N. Y.Dravo Corporation Engineering Works

Division, Pittsburgh, Pa.Eastern Machine Screw Corporation,

The, New Haven, Conn.Eastman Kodak Co., Hawk-Eye Divi-

sion, Rochester, N. Y.Eastwood-Nealley Corp., Belleville, N.J.Economy Engineering Co., The, Wil-

loughby, Ohio.Ekstrom, Carlson & Co., Rockford, lU.

Electric Boat Co., Groton, Conn.Elterich Co., Chas., New York, N. Y.

(In Principle.)

Emery Industries, Inc., Cincinnati,Ohio.

Engineers Club of Philadelphia, Pa.,Philadelphia, Pa. (In Principle.)

Erie Bolt & Nut Co., Erie, Pa.Essley Machinery Co., The E. L.,

Chicago, 111. (In Principle.)

Fairbanks, Morse & Co., Beloit, Wis.Federal Products Corporation, Provi-

dence, R. I.

Federal Screw Works, Detroit, Mich.Ferry Cap & Set Screw Co., The, Cleve-

land, Ohio.Firestone Steel Prdoucts Co., Akron,

Ohio.Firestone Tire & Rubber Co., Akron,

Ohio.Flannery Bolt Co., Bridgeville. Pa.Fox Munitions Corporation, Philadel-

phia, Pa.Foxboro Co., The, Foxboro, Mass.General Engineering Works, Chicago,

111 .

General Electric Co., Schenectady, N. Y.General Manufacturing Co., The,

Waterbury, Conn.General Motors Corporation, Detroit,

Mich.Geometric Tool Co., The, New Haven,

Conn.Gibbs & Cox, Inc., New York, N. Y.Gisholt Machine Co., Madison, Wis.Globe Products Co., The, Cleveland,

Ohio.Grabler Manufacturing Co., The, Cleve-

land, Ohio.Grant Manufacturing & Machine Co.,

The, Bridgeport, Conn.Graves Elevator Co., Inc., Rochester,

N. Y.Greenfield Tap & Die Corporation,

Greenfield, Mass.Greenlee Bros. & Co., Rockford, lU.


Grimm Hardware Co., Inc., W. H.,

Chicago, 111.

Gurley, W. & L. E., Troy, N. Y.Haines Gauge Co., Inc., Philadelphia,

Pa.Hardware Products Co., Inc., Boston,

]VI£tSS

Harper Co., The H. M., Chicago, 111.

Hartford Machine Screw Co., Hartford,Conn.

Hassall, Inc., John, Brooklyn, N. Y.Haynes Stellite Co., Kokomo, Ind.

Hodell Chain Co., The, Cleveland, Ohio.

Hood Co., R. H., Philadelphia, Pa.Hooper Co., Inc., F. X., Glenarm, Md.Hudson Motor Car Co., U. S. NavalOrdnance Plant, Center Line, Mich.

Illinois Iron & Bolt Co., Carpentersville,

111 .

Imsande Screw Products Co., Cincin-nati, Ohio.

Indicating Calipers Corporation, NewYork, N. Y.

International Business Machines Cor-poration, Endicott, N. Y.

International Harvester Co., Chicago,111 .

International Machine Tool Corpora-tion, Foster Division, Elkhart, Ind.

International-Stacey Corporation, In-ternational Derrick & EquipmentDivision, Columbus, Ohio.

Isaacson Iron Works, Seattle, Wash.Iverson & Laux, Inc., Chicago, 111.

Jacobs Aircraft Engine Co., Plant No. 1,

Pottstown, Pa.Jeffrey Manufacturing Co., The, Colum-

bus, Ohio.Johnson Automatics Manufacturing Co.,

Providence, R. I.

Johnson Rule Manufacturing Co., E. P.,

Chicago, 111.

Johnston & Jennings Co., The, Cleve-land, Ohio.

Jones & Lamson Machine Co., Spring-field, Vt.

Jordan Machine Products, Inc., Detroit,Mich.

Judson-Pacific Co., San Francisco, Calif.

Kaufman Manufacturing Co., L. J.,

Manitowoc, Wis.King Engineering Corporation, Ann

Arbor, Mich.Kinner Motors, Inc., Glendale, Calif.

Kramer Co., C. P., Chicago, 111.

Lamson & Sessions Co., The, Cleveland,Ohio.

Landis Machine Co., Waynesboro, Pa.Lanman Co., The E. B., East Chicago,

Ind.Larson Tool & Stamping Co., Attleboro,

Mass.Lima Locomotive Works, Inc., Lima,

Ohio.Link-Belt Ordnance Co., Chicago, 111.

Lionel Corporation, The, Irvington, N. J.

Los Angeles Testing Laboratory, LosAngeles, Calif.

Lundberg Screw Products Co., Lansing,Mich.

Machined Products Co., Louisville, Ky.MacLean-Fogg Lock Nut Co., Chicago,

111 .

Macy & Co., Inc., R. H., New York,N. Y.

Maine Steel, Inc., South Portland,Maine.

Mann & Co., Hutchinson, Kans.Maryland Bolt & Nut Co., The,

Baltimore, Md.Mattatuck Manufacturing Co., The,

Vv^aterbury, Conn.Merrill Brothers, Maspeth, N. Y.Mid-Vv"est Screw Products Co., St.

Louis, Mo.Milled Screw Products Co., Chicago,

111 .

Milton Manufacturing Co., The, Milton,Pa.

Mitchell Engineering Co., The, Springfield, Ohio.

Modern Tool Works, Rochester, N. Y.Moore, Inc., George W., Boston, Mass.Morrow Screw & Nut Co., Ltd., Inger-

soll, Ontario, Canada.Morse Twist Drill & Machine Co., New

Bedford, Mass.Mueller Co., Decatur, 111.

Murchey Machine & Tool Co., Detroit,Mich.

Napoleon Products Co., The, Napoleon,Ohio.

National Acme Co., The, Cleveland,Ohio.

National Brass Co., Grand Rapids,Mich.

National Lock Co., Rockford, 111.

National Machine Products Co., De-troit, Mich.

NationM Screw & Manufacturing Co.,The, Cleveland, Ohio.

New Britain Machine Co., The NewBritain, Conn.

New York Air Brake Co., The, Water-town, N. Y.

New York Central System, New York,N. Y.

Nilson Machine Co., The A. H.,Bridgeport, Conn.

North & Judd Manufacturing Co.,New Britain, Conn.

Northwest Automatic Products Corpo-ration, Minneapolis, Minn.

Northwest Bolt & Nut Co., Seattle,

Wash.Ohio Brass Co., The, Mansfield, Ohio.Oliver Iron & Steel Corporation, Pitts-

burgh, Pa.Osgood Engineering Co., Boston, Mass.Ottemiller Co., The Wm. H., York, Pa.Pacific Car & Foundry Co., Renton,Wash.

Packard Motor Car Co., Detroit, Mich.Palnut Co.j The, Irvington, N. J.

Parker Wire Goods Co., Worcester,Mass.

62 Commercial Standard CS24-JfS

Pawtucket Manufacturing Co., Paw-tucket, R. I.

Peck, Stow & Wilcox Co., Southington,Conn.

Peerless Manufacturing Corporation,Louisville, Ky.

Penn Screw & Machine Works, Phila-delphia, Pa.

Perry Fay Co., Elyria, Ohio.Pheoll Manufacturing Co., Chicago, 111.

Philadelphia Hardware & MalleableIron Works, Inc., Philadelphia, Pa.

Pioneer Engineering & ManufacturingCo., Detroit, Mich.

Pioneer Pump & Manufacturing Co.,Detroit, Mich.

Pittsburgh Screw & Bolt Corporation,Pittsburgh, Pa.

Potter Tool & Machine Works, Inc.,

New York, N. Y.Pratt Manufacturing Co., WiUiam E.,

Joliet, 111.

Precision Thermometer & InstrumentCo., Philadelphia, Pa.

Pullman-Standard Car ManufacturingCo., Worcester, Mass.

Quadriga Manufacturing Co., The, Chi-cago, 111.

Ramsdell Manufacturing Co., Cleve-land, Ohio.

Rausch Nut & Manufacturing Co., The,Cleveland, Ohio.

Reading Hardware Corporation, Read-ing, Pa.

Reed Manufacturing Co., Erie, Pa.Reed & Prince Manufacturing Co.,

Worcester, Mass.Reed Small Tool Works, Worcester,

Mass.Republic Steel Corporation, Bolt & Nut

Division of, Cleveland, Ohio.Resistoflex Corporation, Belleville, N. J.

Reynolds Co., Hal W., Cleveland, Ohio.Rhode Island Tool Co., Providence, R. I.

Rochester Machine Screw Co., Inc.,

Rochester, N. Y.Rogers Tool Corporation, John M.,

Gloucester City, N. J.

Rolled Thread Die Co,, Worcester, Mass.Russell, Burdsall & Ward Bolt & Nut

Co., Port Chester, N. Y.Russell & Erwin Manufacturing Co.,New Britain, Conn.

Sabin Machine Co., Cleveland, Ohio.St. Louis Screw & Bolt Co., St. Louis,

Mo.Sargent & Greenleaf, Inc., Rochester,

N. Y.Scherr Co., Inc., George, New York,

N. Y.Schnorr & Co., C. H., Springdale, Pa.Scovill Manufacturing Co., Waterbury,

Conn.Screw Machine Specialty Co., Pitts-

burgh, Pa.Sears, Roebuck & Co., Chicago, 111.

Seymour Brass Turning Co., Seymour,Conn.

Shakeproof, Inc., Chicago, 111.

Sheffield Corporation, The, Dayton,Ohio.

Sherman-Klove Co., The, Chicago, lU.Simmons Machine Tool Corporation,

Albany, N. Y.Smalley-General Co., Bay City, Mich.Smith Manufacturing Co., F. H., Chi-

cago, 111.

Snap-On Tools Corporation, Kenosha,Wis.

South Bend Lathe Works, South Bend,Ind.

Standard Gage Co., Inc., Poughkeepsie,N. Y.

Standard Nut & Bolt Co., VaUey Falls,

R. I.

Standard Shop Equipment Co., Phila-delphia, Pa.

Stevens Inc., John B., New York, N. Y.Stewart Warner Corporation, Stewart

Die Casting Division, Chicago, 111.

Strong, Carlisle & Hammond Co.,Cleveland, Ohio.

Stulz-Sickles Co., Newark, N. J.

Superior Machine & Engineering Co.,Detroit, Mich.

Superex Gage Co., Ferndale, Mich.Taft-Peirce Manufacturing Co., The,

Woonsocket, R. I.

Taylor Instrument Companies, Roch-ester, N. Y.

Taylor-Wharton Iron & Steel Co.,Easton, Pa.

Teer, Wickwire & Co., Jackson, Mich.Thompson Products, Inc., Cleveland,

Ohio.Threadwell Tap & Die Co., Greenfield,

Mass.Thwing-Albert Instrument Co., Phila-

delphia, Pa.Triplex Machine Tool Co., New York,

N. Y.Triplex Screw Co., Cleveland, Ohio.Trundle Engineering Co., The, Cleve-

land, Ohio.Twining Laboratories, The, Fresno,

Calif.

Union Twist Drill Co., Butterfield Di-vision, Derby Line, Vt.

Union Twist Drill Co., S. W. Card _Manufacturing Division. Mansfield,

”

]VIS;SS

United Drill & Tool Corporation, Whit-man & Barnes Division, Detroit,Mich.

Upson-Walton Co., The, Cleveland,Ohio.

V & O Press Co., Inc., The, Hudson,N. Y.

Van Keuren Co., The, Watertown,Mass. I

Vard Inc., Pasadena, Calif.j

Vega Aircraft Corporation, Burbank,j

Calif.I

Virginia Polytechnic Institute, Blacks-,

burg, Va.,


Waltham Machine Works, Waltham,Mass.

Walworth Co., New York, N. Y.Waterbury Button Co., Waterbury,Conn.

Waterbury Barrel Foundry & MachineCo., Waterbury, Conn.

Weatherhead Co., The, Cleveland, Ohio.

Weiler, Edward W., New York, N. Y.(In Principle.)

Wells Tool Co., Greenfield, Mass.Western Automatic Machine Screw Co.,

The, Elyria, Ohio.Western Electric Co., Inc., New York,

N. Y.Western Machine Co., Milwaukee, Wis.Western Union Telegraph Co., Inc.,

New York, N. Y.Westinghouse Electric & Manufactur-

ing Co., Pittsburgh, Pa.Williams & Co., J. H., Buffalo, N. Y.

Winter Brothers Co., Wrentham, Mass.Woodruff & Sons Co., The Walter W.,

Mt. Carmel, Conn.Woodworkers Tool Works, Inc., Chi-

cago, 111.

Worthington Pump & Machinery Cor-poration, Harrison, N. J.

Wright Accurate Screw Machine Prod-ucts, Albert, San Francisco, Calif.

Wright Machine Co., Worcester, Mass.

U. S. GOVERNMENT

Agriculture, U. S. Department of,

Washington, D. C.Panama Canal, The, Mechanical Divi-

sion, Balboa, C. Z.

Treasury Department, Washington,D. C.

Veterans Administration, Washington,D. C.

INDEX

A Page

American National screw threads:Coarse-thread series 9, 10, 14, 16, 188-pitch thread series 24, 25, 28Extra-fine thread series 38, 39, 40Fine thread series 12, 13, 20, 2216-pitch thread series 25, 27, 34, 3612-pitch thread series 24, 26, 30, 32

Acceptance of standard 57Acceptors of standard 59Acceptor’s responsibility 68Allowance (definition) 4Angle of thread (definition) 3Angle of thread (specifications) 8Angle—half angle of thread (definition)... 3Angle—helix angle of thread (definition) 3Area, mean area (definition) 4Axis of screw (definition)... 3

B

Base of thread (definition). 3Basic size (definition) 6Basic diameter:Coarse-thread series 108-pitch-thread series 25Extra-fine-thread series 39Fine-thread series 1316-pitch-thread series 2712-pitch-thread series 26

C

Classes of fits. (See Fits.)

Clearance at major diameter (specifications) 8Clearance at minor diameter (specifications) 8Clearance, crest (definition) 6Clearance, terms relating to 4

Coarse-thread series (screw threads)

:

Basic diameters and thread data 10

Limiting dimensions and tolerances, classes 1,

2, 3, and 4 fits 14, 16, 18Tap-drill sizes. (See Tap drills.)

Committee, standing 63

Crest of thread (definition) 3

Crest clearance (definition). 6

DDefinitions:Allowance 4Angle of thread 3

Axis of a screw ; 3

Base of thread.. 3

Basic size 6

Crest clearance 6Crest of thread 3

Depth of engagement 4

Depth of thread 4

External and internal threads 2Finish 6

Fit 6Half angle of thread 3

Helix angle of thread 3

Lead 2Length of engagement 4

Limits 7

Major diameter 2Minor diameter 2Mean area 4Neutral zone 7

Number of threads 4

Pitch... 2

Pitch diameter 2Pitch line. 4

64

Definitions:—Continued.Root 3Screw thread 2Side or flank 3Thickness of thread 4Tolerance 6

Department of Commerce responsibility 68Depth of engagement (definition) 4Depth of thread (definition) 4Depth of thread (specifications) 8Diameter, major (definition) 2Diameter, minor (definition) 2Diameter, pitch (definition) 2Diameters, basic (coarse-thread series) 10Diameters, basic (fine-thread series) 13Dimensions. (See Fits.)

Directions of tolerances on screw and nut (seefig. 10).

Drills. (See Tap drills.)

E

Eight-pitch screw-thread series:

Basic diameters and thread data 26Limiting dimensions and tolerances, classes

2 and 3 fits 28Tap-drill sizes 47

Enforcement 68Engagement, depth of 4Engagement, length of 4Extra-fine screw-thread series:

Basic diameters and thread data 39Limiting dimensions and tolerances, classes

2 and 3 fits 40Tap-drill sizes 62,63

External thread (definition) 2

F

Flank or side (definition) 3Fiat at crest and root (specifications) 8Flank—side of flank (definition) 3Fine thread series:

Recommendations 12Basic diameters and thread data 13Limiting dimensions and tolerances, classes 1,

2, 3, and 4 fits 20,22Tap-drill sizes 46,46

Finish (definition) 6Fit (definition) 6Fits:

Coarse-thread series—classes 1, 2, 3, and4 fits 14,16,18

8-pitch-thread series—classes 2 and 3 fits 28Extra-fine-thread series—classes 2 and 3 fits... 40

Fine-thread series—classes 1, 2, 3 and 4 fits.. 20, 2216-pitch-thread series—classes 2 and 3 fits... 34, 3612-pitch-thread series—classes 2 and 3 fits... 30, 32

HHalf angle of thread (definition) 3Helix angle of thread (definition) 3History of project 64

I

Identification symbols 7

Internal thread (definition). 2

LLabeling 63Lead (definition) 2

Length of engagement (definition) 4

Limiting dimensions and tolerances. (See Fits.)

Limits (definition) 7

Index 65

M Page

Major diameter (definition) 2

Mean area (definition) 4

Minor diameter (definition) 2

N

Neutral zone (definition) 7

Nomenclature. {See Terms relating to classi-

fications and tolerances.)

Notation. {See Definitions, Symbols.)Number of threads (definition) 4Numbering of tables 2

PPitch (definition) 2Pitch diameter (definition) 2

Pitch line (definition) 4

Promulgation of Commercial Standard CS24-43. II

Purpose of Commercial Standard CS24-43 9

R

Responsibility of Acceptor 58Responsibility of Department of Commerce 58Root (definition) 3

S

Screw thread (definition) 2Scope of Commercial Standard CS24-43 1

Side or flank (definition) 3Sixteen-pitch screw-thread series:

Basic diameters and thread data 27Limiting dimensions and tolerances, classes 2

and 3 fits 34, 36Tap-drill sizes 50,51

Sizes of tap drills. {See Tap drills.)

Specifications:Angle of thread 8Flat at crest and root 8

Depth of thread 8Clearance at minor diameter 8Clearance at major diameter 8

Thread series 8Standing committee 53Standards, Commercial list of 66Symbols (identification) 7

TTables:

Coarse-thread series:

Sizes No. 1 (0.073") to 4"... 10, 11

Classes 1, 2, 3, and 4 fits 14, 16, 188-pitch-thread series

Sizes 1" to 6" 25Classes 2 and 3 fits 28

Tables:—Continued. ' PageExtra-fine-thread series

Sizes K" to 2" 39Classes 2 and 3 fits 40

Fine-thread series

Sizes No. 0 fO.OOO") to IVi” 13Classes 1, 2, 3, and 4 fits 20, 22

16-pitch-thread series

Sizes to 4" 27Classes 2 and 3 fits 34, 36

12-pitch-thread series

Sizes Vi" to 6" 26Classes 2 and 3 fits 30, 32

Tap drills for No. 1 to 3%" coarse-threadseries 43, 44

Tap drills for 1" to 31^" 8-pitch-thread series,. 47Tap drills for H" to 2" extra-fine-thread

series 52, 53Tap drills for No. 0 tolW' fine-thread series. 45, 46Tap drills for U" to 3)4" 16-pitch-thread

series 50, 51Tap drills for )4" to 3)4" 12-pitch-thread

series 48,49Numbering of 2Scope of 1

Tap-drill sizes:

Coarse-thread series 43,448-pitch-thread series 47Extra-fine-thread series 52, 53Fine-thread series 45, 4616-piteh-thread series 50,5112-pitch -thread series 48, 49Specifications 42

Terms relating to classification and toler

ances 4, 5, 6, 7Tliickness of thread (definition) 4Thread, thickness of (definition) 4Thread data:

Coarse-thread series 10Definitions. {See Definitions.)8-pitch-thread series 25Extra-fine-thread series 39Fine-thread series 13

16-pitch-thread series 2712-pitch-thread series 26Specifications. {See Specifications.)

Thread series (specifications) 8

Tolerance (definition) 5Tolerances, terms relating to 4, 5, 6, 7

Tolerances. {See Fits.)

Twelve-pitch screw-thread series:

Basic diameters and thread data 26Limiting dimensions and tolerances, classes 2

and 3 fits... 30, 32Tap-drillsizes 48, 49

U

Uniform-pitch screw-thread series;

8-, 12-, 16-pitch-thread series 24,25

COMMERCIAL STANDARDSCS No. Item

0-

40. Commercial standards and their value to busi-ness (third edition).

1-

42. Clinical thermometers (third edition).

2-

30. Mopsticks.

3-

40. Stoddard solvent (third edition).

4-

29. Staple porcelain (all-clay) plumbing fixtures.

5-

40. Pipe nipples; brass, copper, steel, and wroughtiron.

6-

31. Wrought-iron pipe nipples (second edition).Superseded by CS5-40.

7-

29. Standard weight malleable iron or steelscrewea unions.

8-

41. Gage blanks (third edition).

9-

33. Builders’ template hardware (second edition)

.

10-

29. Brass pipe nipples. Superseded by CS5-40.

11-

41. Moisture regains of cotton yarns (secondedition).

12-

40. Fuel oils (fifth edition).

13-

42. Dress patterns (third edition).14r-39. Boys’ button-on waists, shirts, junior and polo

shirts (made from woven fabrics) (secondedition).

15-

29. Men’s pajamas.

16-

29. Wall paper.

17-

42. Diamond core drill fittings (third edition).

18-

29. Hickory golf shafts.

19-

32. Foundry patterns of wood (second edition).

20-

42. Staple vitreous china plumbing fixtures (thirdedition).

21-

39. Interchangeable ground-glass joints, stop-cocks, and stoppers (fourth edition).

22-

40. Builders’ hardware (nontemplate) (secondedition).

23-

30. Feldspar.

24-

43. Screw threads and tap-drill sizes.

25-

30. Special screw threads. Superseded byCS 24-43.

26-

30. Aromatic red cedar closet lining.

27-

36. Mirrors (second edition).

28-

32. Cotton fabric tents, tarpaulins, and covers.

29-

31. Staple seats for water-closet bowls.

30-

31. Colors for sanitary ware.

31-

38. Wood shingles (fourth edition).

32-

31. Cotton cloth for rubber and pyroxylin coating.

33-

32. Knit underwear (exclusive of rayon).

34-

31. Bag, case, and strap leather.

35-

42. Plyv^cod (hardwood and eastern red cedar)(second edition).

36-

33. Fourdrinier wire cloth (second edition).

37-

31. Steel bone plates and screws.

38-

32. Hospital rubber sheeting.

39-

37. Wool and part wool blankets (second edition)(Withdrawn as commercial standard, July14, 1941).

40-

32. Surgeons’ rubber gloves.

41-

32. Surgeons’ latex gloves.

42-

35. Fiber insulating board (second edition).

43-

32. Grading of sulphonated oils.

44-

32. Apple wraps.

45-

42. Douglas fir plywood (fifth edition).

46-

40. Hosiery lengths and sizes (third edition).

47-

34. Marking of gold-filled and rolled-gold-platearticles other than watchcases.

48-

40. Domestic burners for Pennsylvania anthracite(underfeed type) (second edition)

.

49-

34. Chip board, laminated chip board, and mis-cellaneous boards for bookbinding purposes.

50-

34. Binders board for bookbinding and otherpurposes.

51-

35. Marking articles made of silver in combina-tion with gold.

52-

35. Mohair pile fabrics (100-percent mohair plainvelvet, 100-percent monair plain frieze, and50-percent mohair plain frieze).

53-

35. Colors and finishes for cast stone.

54-

35. Mattresses for hospitals.

55-

35. Mattresses for institutions.

56-

41. Oak flooring (second edition).

57-

40. Book cloths, buckrams, and impregnated fab-

rics for bookbinding purposes except librarybindings (second edition).

CS No. Item58-

36. Woven elastic fabrics for use in overalls (over-all elastic webbing).

59-

41. Woven textile fabrics—testing and reporting(third edition).

60-

36. Hardwood dimension lumber.

61-

37. Wood-slat Venetian blinds.

62-

38. Colors for kitchen accessories.

63-

38. Colors for bathroom accessories.

64-

37. Walnut veneers.

65-

43. Methods of analysis and of reporting fiber

composition of textile products (secondedition)

.

66-

38. Marking of articles made wholly or in part ofplatinum.

67-

38. Marking articles made of karat gold.

68-

38. Liquid hypochlorite disinfectant, deodorant,and germicide.

69-

38. Pine oil disinfectant.

70-

41. Phenolic disinfectant (emulsifying type) (sec-

ond edition) (published with CS71-41).

71-

41. Phenolic disinfectant (soluble type) (secondedition) (published with CS70-41).

72-

38. Household insecticide (liquid spray type).

73-

38. Old growth Douglas fir standard stock doors.

74-

39. Solid hardwood wall paneling.

75-

42. Automatic mechanical draft oil burners de-

signed for domestic installations (secondedition)

.

76-

39. Hardwood interior trim and molding.

77-

40. Sanitary cast-iron enameled ware.

78-

40. Groxmd-and-polished lenses for sun glasses

(second edition) (published with CS79-40).

79-

40. Blown, drawn, and dropped lenses for sunglasses (second edition) (published withCS78-40).

80-

41. Electric direction signal systems other thansemaphore type for commercial and othervehicles subject to special motor vehiclelaws (after market)

.

81-

41. Adverse-weather lamps for vehicles (after

market)

.

82-

41. Inner-controlled spotlamps for vehicles (after

market)

.

83-

41. Clearance, marker, and identification lampsfor vehicles (after market).

84-

41. Electric tail lamps for vehicles (after market).

85-

41. Electric license-plate lamps for vehicles (after

market)

.

86-

41. Electric stop lamps for vehicles (after market).

87-

41. Red electric warning lanterns.

88-

41. Liquid-burning flares.

89-

40. Hardwood stair treads and risers.

90-. (Reserved for power shovels and cranes).

91-

41. Factory-fitted Douglas fir entrance doors.

92-

41. Cedar, cypress, and redwood tank stocklumber.

93-

41. Portable electric drills (exclusive of highfrequency).

94-

41. Calking lead.

95-

41. Lead pipe.

96-

41. Lead traps and bends.

97-

42. Electric supplementary driving and passinglamps for vehicles (after market)

.

98-

42. Artists’ oil paints.

99-

42. Gas floor furnaces—gravity circulating type.

100-

42. Multiple-coated, porcelain-enameled steel

utensils.

101-

43. Flue-connected oil-burning space heatersequipped with vaporizing pot-type burners.

102- . (Reserved for Diesel and fuel-oil engines).

103-

42. Cotton and rayon velour (jacquard andplain).

(E) 104-43. Warmairfurnacesequipped with vapor-izing pot-type oil burners.

105-43. Mineral wool; loose, granulated, or feltedform, in low-temperature installations.

(E) 106-43. Boys’ pajamas (made from woven fab-rics).

Notice.—Those interested in commercial standards with a view toward accept-ing them as a basis of everyday practice may secure copies of the above standards,while the supply lasts, by addressing the Division of Trade Standards, NationalBureau of Standards, Washington D. C.

66 O