as 1237-2-2002 plain washers for metric bolts screws and nuts for general purposes tolerances

AS 1237.2—2002ISO 4759-3:2000

Australian Standard™

Plain washers for metric bolts, screwsand nuts for general purposes

Part 2: Tolerances[ISO title: Tolerances for fasteners, Part 3: Plain washers for bolts,screws and nuts—Product grades A and C]

AS

1237.2

This Australian Standard was prepared by Committee ME-029, Fasteners. It wasapproved on behalf of the Council of Standards Australia on 16 September 2002and published on 27 September 2002.

The following are represented on Committee ME-029:

Australian Chamber of Commerce and Industry

Australian Industry Group

Australian Institute of Steel Construction

Bureau of Steel Manufacturers of Australia

Electricity Supply Association of Australia

Federal Chamber of Automotive Industries

Institute of Materials Engineering Australasia

Keeping Standards up-to-dateStandards are living documents which reflect progress in science, technology andsystems. To maintain their currency, all Standards are periodically reviewed, andnew editions are published. Between editions, amendments may be issued.Standards may also be withdrawn. It is important that readers assure themselvesthey are using a current Standard, which should include any amendments whichmay have been published since the Standard was purchased.Detailed information about Standards can be found by visiting the StandardsAustralia web site at www.standards.com.au and looking up the relevant Standardin the on-line catalogue.Alternatively, the printed Catalogue provides information current at 1 January eachyear, and the monthly magazine, The Australian Standard, has a full listing ofrevisions and amendments published each month.We also welcome suggestions for improvement in our Standards, and especiallyencourage readers to notify us immediately of any apparent inaccuracies orambiguities.

This Standard was issued in draft form for comment as DR 02298.

巴巴客标准 www.babake.net 免费下载

http://www.standards.com.au

AS 1237.2—2002

Australian Standard™

Plain washers for metric bolts, screwsand nuts for general purposes

Part 2: Tolerances

Originated as part of AS 1237—1973.Revised and redesignated in part as AS 1237.2—2002.

COPYRIGHT© Standards Australia International

ii

PREFACE

This Standard was prepared by the Standards Australia Committee ME-029, Fasteners to supersedeAS 1237—1973, Flat metal washers for general engineering purposes (metric series), in part.

The objective of this Standard is to provide manufacturers, suppliers and users with tolerances for theprinciple features of plain washers, product grades A and C for use with metric bolts, screws, studsand nuts with nominal thread diameters from 1 mm to 150 mm inclusive.

This Standard is identical with and has been reproduced from ISO 4759-3:2000, Tolerances forfasteners, Part 3: Plain washers for bolts, screws and nuts—Product grades A and C.

The term ‘informative’ has been used in this Standard to define the application of the annex to whichit applies. An ‘informative’ annex is only for information and guidance.

Attention is drawn to the possibility that some of the elements of this Standard may be the subject ofpatent rights. Standards Australia shall not be held responsible for identifying any or all such patentrights.

As this Standard is reproduced from an international Standard, the following applies:

(a) Its number does not appear on each page of text and its identify is shown only on the cover andtitle page.

(b) In the source text ‘this part of ISO 4759’ should read ‘this Australian Standard’.

(c) A full point should be substituted for a comma when referring to a decimal marker.

References to international Standards should be replaced by references to Australian orAustralian/New Zealand Standards as follows:Reference to International Standard Australian Standard or Australian/New Zealand

StandardISO AS286 ISO system of limits and fits 1654 ISO system of limits and fits286-1 Part 1: Bases of tolerances,

deviations and fits1654.1 Part 1: Bases of tolerances, deviations and

fits286-2 Part 2: Tables of standard

tolerance grades and limitdeviations for holes and shafts

1654.2 Part 2: Tables of standard tolerance gradesand limit deviations for holes and shafts

1101 Geometrical ProductSpecifications (GPS)—Geometrical tolerancing—Tolerances of form, orientation,location and run-out

—

2692 Technical drawings—Geometricaltolerancing—Maximum materialprinciple

—

4042 Fasteners—Electroplated coatings —


AUSTRALIAN STANDARD

Plain washers for metric bolts, screws and nuts for general purposes

Part 2:

Tolerances

1 Scope

This part of ISO 4759 establishes a selection of tolerances for use in the preparation of ISO product standards forpunched plain washers of product grades A and C, for use with bolts, screws and nuts of nominal thread diametersof from 1 mm to 150 mm inclusive.

It is recommended that these tolerances also be used for non-standard washers.

NOTE The product grade refers to the quality of the product and to the size of the tolerances.

Annex A (informative) presents tolerances taken from ISO 286-1 and ISO 286-2.

2 Normative references

The following normative documents contain provisions which, through reference in this text, constitute provisions ofthis part of ISO 4759. For dated references, subsequent amendments to, or revisions of, any of these publicationsdo not apply. However, parties to agreements based on this part of ISO 4759 are encouraged to investigate thepossibility of applying the most recent editions of the normative documents indicated below. For undatedreferences, the latest edition of the normative document referred to applies. Members of ISO and IEC maintainregisters of currently valid International Standards.

ISO 1101—1), Geometrical product specifications (GPS) — Geometrical tolerancing — Tolerances of form,orientation, location and run-out.

ISO 2692:1988, Technical drawings — Geometrical tolerancing — Maximum material principle.

ISO 4042:1999, Fasteners — Electroplated coatings.

3 Tolerances

The tolerances for plain washers of product grades A and C are given in Table 1.

Unless otherwise specified, the tolerances specified in this part of ISO 4759 apply to washers prior to coating; seealso ISO 4042.

1) To be published. (Revision of ISO 1101:1983)

www.standards.com.au Standards Australia

1


Deviations from the tolerances specified in this part of ISO 4759 are permitted in product standards only for validtechnical reasons. In cases where there is a difference between the tolerance requirements in this part of ISO 4759and the product standard, the latter takes precedence.

The tolerances of form and position are specified and indicated according to the definitions of ISO 1101 andISO 2692.

Table 1

Tolerances

Product grades

Feature

A C

3.1 Clearance hole (punched) h d1 h1 h d1

mm tol. min. mm tol.

h u 4 H13 0,5 h h u 4 H14

h � 4 H14 0,3 h h � 4 H15

Rollover and fracture are undefinedbut shall be present.

h1, rollover and fractureare undefined but shallbe present.

Key

1 Rollover

2 Fractureh1 is the part of the hole within the tolerance specified for d1.

h d2 d2

mm tol. tol.

h u 4 h14

h > 4 h15h16

h2, rollover and fracture are undefined but present.

3.2 Outside diameter (punched)

Key

1 Rollover

2 Fracture

h2, is the part of the outer contour within the tolerancespecified for d2.


2



Table 1 (continued)

TolerancesProduct gradesFeature

A C

h htol. tol.

mm mm mm mm

h u 0,5 � 0,05 h u 0,5 � 0,10,5 < h u 1 � 0,1 0,5 < h u 1 � 0,21 < h u 2,5 � 0,2 1 < h u 2,5 � 0,32,5 < h u 4 � 0,3 2,5 < h u 4 � 0,64 < h u 6 � 0,6 4 < h u 6 � 16 < h u 10 � 1 6 < h u 10 � 1,2

3.3 Thickness

10 < h u 20 � 1,2 10 < h u 20 � 1,6

� = 30� to 45°

emin = 0,25 h

3.4 Chamfer

emax = 0,5 h

3.5 Tolerances of form and positionh �h

mm mm

h u 0,5 0,025

0,5 < h u 1 0,05

1 < h u 2,5 0,1 (No requirements)

2,5 < h u 4 0,15

4 < h u 6 0,2

3.5.1 Thickness variation �h on the samepart

6 < h u 10 0,3

NOTE Requirements for �h apply at adistance of x = 0,1 (d2 � d1) from the edge of thehole and the outer edge: i.e. only on 60 % ofthe ring width.

10 < h u 20 0,4


3


Table 1 (continued)

TolerancesProduct gradesFeature

A C

d2 t1 d2 t1mm mm

d2 u 50 2 IT12 d2 u 50 2 IT15d2 > 50 2 IT13 d2 > 50 2 IT16

3.5.2 Coaxiality

NOTE Tolerance t1 is based on dimension d2.

h t2a

mm mm

Stainless steel excepted

h u 0,5 0,1

0,5 < h u 1 0,15

1 < h u 2,5 0,2

2,5 < h u 4 0,3

4 < h u 6 0,4

6 < h u 10 0,6 (No requirements)

10 < h u 20 1

Stainless steel

h u 0,5 0,15

0,5 < h u 1 0,22

1 < h u 2,5 0,3

2,5 < h u 4 0,45

3.5.3 Flatness

4 < h u 6 0,6

6 < h u 10 0,9NOTE Tolerance t2 is always independent of thethickness tolerance for h. 10 < h u 20 1,5

a Flatness is measured after removal of burrs.


4



Annex A(informative)

Tolerances

Standard tolerance grades for IT values are given in table A.1 and the limit deviations for shafts and holes intables A.2 and A.3, respectively. These tolerances are taken from ISO 286-1 and ISO 286-2.

Table A.1 — IT values of standard tolerance grades in millimetres

Nominal dimensions Standard tolerance gradesIT12 IT13 IT15 IT16over to

Tolerances3 0,1 0,14 0,4 0,6

3 6 0,12 0,18 0,48 0,756 10 0,15 0,22 0,58 0,9

10 18 0,18 0,27 0,7 1,118 30 0,21 0,33 0,84 1,330 50 0,25 0,39 1 1,650 80 0,3 0,46 1,2 1,980 120 0,35 0,54 1,4 2,2

120 180 0,4 0,63 1,6 2,5180 250 0,46 0,72 1,85 2,9

Table A.2 — Limit deviations for shafts

Nominal dimensions Limit deviationsmm mm

over to h14 h15 h16

3� 0 25

0, � 0 4

0, � 0 6

0,

3 6� 0 3

0, � 0 48

0, � 0 75

0,

6 10� 0 36

0, � 0 58

0, � 0 9

0,

10 18� 0 43

0, � 0 7

0, � 11

0,

18 30� 0 52

0, � 0 84

0, � 13

0,

30 50� 0 62

0, � 1

0� 16

0,

50 80� 0 74

0, � 12

0, � 19

0,

80 120� 0 87

0, � 14

0, � 2 2

0,

120 180 01� � 16

0, � 2 5

0,

180 250� 115

0, � 185

0, � 2 9

0,

Table A.3 — Limit deviations for holes

Nominal dimensions Limit deviationsmm mm

over to H13 H14 H15

3 00 14� ,

00 25� ,

00 4� ,

3 6 00 18� ,

00 3� ,

00 48� ,

6 10 00 22� ,

00 36� ,

00 58� ,

10 18 00 27� ,

00 43� ,

00 7� ,

18 30 00 33� ,

00 52� ,

00 84� ,

30 50 00 39� ,

00 62� ,

01�

50 80 00 46� ,

00 74� ,

012� ,

80 120 00 54� ,

00 87� ,

014� ,

120 180 00 63� ,

01�

016� ,

180 250 00 72� ,

0115� ,

0185� ,


5


Bibliography

[1] ISO 286-1:1988, ISO system of limits and fits — Part 1: Bases of tolerances, deviations and fits.

[2] ISO 286-2:1988, ISO system of limits and fits — Part 2: Tables of standard tolerance grades and limitdeviations for holes and shafts.


6



Standards Australia

Standards Australia is an independent company, limited by guarantee, which prepares and publishes

most of the voluntary technical and commercial standards used in Australia. These standards are

developed through an open process of consultation and consensus, in which all interested parties are

invited to participate. Through a Memorandum of Understanding with the Commonwealth government,

Standards Australia is recognized as Australia’s peak national standards body.

Australian Standards

Australian Standards are prepared by committees of experts from industry, governments, consumers

and other relevant sectors. The requirements or recommendations contained in published Standards are

a consensus of the views of representative interests and also take account of comments received from

other sources. They reflect the latest scientific and industry experience. Australian Standards are kept

under continuous review after publication and are updated regularly to take account of changing

technology.

International Involvement

Standards Australia is responsible for ensuring that the Australian viewpoint is considered in the

formulation of international Standards and that the latest international experience is incorporated in

national Standards. This role is vital in assisting local industry to compete in international markets.

Standards Australia represents Australia at both ISO (The International Organization

for Standardization) and the International Electrotechnical Commission (IEC).

Electronic Standards

All Australian Standards are available in electronic editions, either downloaded individually from our Web

site, or via on-line and CD ROM subscription services.


ISBN 0 7337 4847 3 Printed in Australia


as 1237-2-2002 plain washers for metric bolts screws and nuts for general purposes tolerances

Documents