iso general purpose metric screw threads— tolerances— … · 2019. 12. 26. · british standard...
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BRITISH STANDARD BS ISO965-2:1998
ISO general purpose metric screw threads — Tolerances —
Part 2: Limits of sizes for general purpose external and internal screw threads — Medium quality
ICS 21.040.10
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BS ISO 965-2:1998
This British Standard, having been prepared under the direction of the Engineering Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 April 1999
© BSI 03-2000
ISBN 0 580 32352 8
National foreword
This British Standard reproduces verbatim ISO 965-2:1998 and implements it as the UK national standard.The UK participation in its preparation was entrusted by Technical Committee FME/9, Bolts, nuts and accessories, to Subcommittee FME/9/3, Reference standards for fasteners, which has the responsibility to:
— aid enquirers to understand the text;— present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed;— monitor related international and European developments and promulgate them in the UK.
A list of organizations represented on this subcommittee can be obtained on request to its secretary.Cross-references
The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue.A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application.
Compliance with a British Standard does not of itself confer immunity from legal obligations.
Summary of pagesThis document comprises a front cover, an inside front cover, pages i and ii, the ISO title page, pages ii to iv, pages 1 to 5 and a back cover.This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.
Amendments issued since publication
Amd. No. Date Comments
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BS ISO 965-2:1998
© BSI 03-2000 i
Contents
PageNational foreword Inside front coverForeword iiiText of ISO 965-2 1
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BS ISO 965-2:1998
ii © BSI 03-2000
Contents
PageForeword iii1 Scope 12 Normative references 13 Definitions 14 Designation 15 Limits of sizes 15.1 Internal threads — Coarse thread series 25.2 External threads — Coarse thread series 35.3 Internal threads — Fine thread series 45.4 External threads — Fine thread series 5Table 1 2Table 2 3Table 3 4Table 4 5
Descriptors: Screw threads, ISO metric threads, threads for bolts, dimensions, dimensional tolerances, designation.
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BS ISO 965-2:1998
© BSI 03-2000 iii
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.International Standard ISO 965-2 was prepared by Technical CommitteeISO/TC 1, Screw threads, Subcommittee SC 2, Tolerances.This third edition cancels and replaces the second edition (ISO 965-2:1980), which has been technically revised.ISO 965 consists of the following parts, under the general title ISO general purpose metric screw threads — Tolerances
— Part 1: Principles and basic data;— Part 2: Limits of sizes for general purpose bolt and nut threads — Medium quality;— Part 3: Deviations for constructional screw threads;— Part 4: Limits of sizes for hot-dip galvanized external threads to mate with internal threads tapped with tolerance position H or G after galvanizing;— Part 5: Limits of sizes for internal screw threads to mate with hot-dip galvanized external screw threads with maximum size of tolerance position h before galvanizing.
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BS ISO 965-2:1998
© BSI 03-2000 1
1 ScopeThis part of ISO 965 specifies limits of sizes for pitch and crest diameters for ISO general purpose metric screw threads (M) conforming to ISO 262 having basic profile according to ISO 68-1.The limits of sizes for the tolerance quality specified are derived from the fundamental deviations and tolerances specified in ISO 965-1.
2 Normative referencesThe following standards contain provisions which, through reference in this text, constitute provisions of this part of ISO 965. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of ISO 965 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards.ISO 68-1:1998, ISO general purpose screw threads Basic profile — Part 1: Metric screw threads. ISO 262:1998, ISO general purpose metric screw threads — Selected sizes for screws, bolts and nuts. ISO 965-1:1998, ISO general purpose metric screw threads — Tolerances — Part 1: Principles and basic data. ISO 5408:1983, Cylindrical screw threads — Vocabulary.
3 DefinitionsFor the purpose of this part of ISO 965 the definitions given in ISO 5408 apply.
4 DesignationA screw thread in conformity with this part of ISO 965 shall be designated according to ISO 965-1.
5 Limits of sizesThe root contour shall not at any point transgress the basic profile.For coated threads, the tolerances apply to the parts before coating, unless otherwise stated. After coating, the actual thread profile shall not at any point transgress the maximum material limits for position H or h respectively.NOTE These provisions are intended for thin coatings, for example those obtained by electroplating.
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BS ISO 965-2:1998
2 © BSI 03-2000
5.1 Internal threads — Coarse thread series
Table 1
Tolerance quality: medium
Thread engagement group: normal
Tolerance class: 5H for threads up to and including M1,46H for threads over M1,4
Dimensions in millimetres
Thread Length of thread engagement Pitch diameter D2
Minor diameter D1
over up to and including
max. min. max. min.
M1M1,2M1,4
0,60,60,7
1,71,72
0,8941,0941,265
0,8381,0381,205
0,7850,9851,142
0,7290,9291,075
M1,6M1,8M2
0,80,81
2,62,63
1,4581,6581,830
1,3731,5731,740
1,3211,5211,679
1,2211,4211,567
M2,5 M3M3,5
1,31,51,7
3,84,55
2,3032,7753,222
2,2082,6753,110
2,1382,5993,010
2,0132,4592,850
M4M5M6
22,53
67,59
3,6634,6055,500
3,5454,4805,350
3,4224,3345,153
3,2424,1344,917
M7M8M10
345
91215
6,5007,3489,206
6,3507,1889,026
6,1536,9128,676
5,9176,6478,376
M12 M14M16
688
182424
11,06312,91314,913
10,86312,70114,701
10,44112,21014,210
10,10611,83513,835
M18M20M22
101010
303030
16,60018,60020,600
16,37618,37620,376
15,74417,74419,744
15,29417,29419,294
M24M27M30
121215
363645
22,31625,31628,007
22,05125,05127,727
21,25224,25226,771
20,75223,75226,211
M33M36M39
151818
455353
31,00733,70236,702
30,72733,40236,402
29,77132,27035,270
29,21131,67034,670
M42M45M48
212124
636371
39,39242,39245,087
39,07742,07744,752
37,79940,79943,297
37,12940,12942,587
M52M56M60
242828
718585
49,08752,78356,783
48,75252,42856,428
47,29750,79654,796
46,58750,04654,046
M64 32 95 60,478 60,103 58,305 57,505Lice
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BS ISO 965-2:1998
© BSI 03-2000 3
5.2 External threads — Coarse thread series
Table 2
Tolerance quality: medium
Thread engagement group: normal
Tolerance class: 6h for threads up to and including M1,46g for threads over M1,4
Dimensions in millimetres
Thread Length of thread engagement Major diameter d
Pitch diameter d2
Root radius
over up to and including
max. min. max. min. min.a
M1M1,2M1,4
0,60,60,7
1,71,72
1,0001,2001,400
0,9331,1331,325
0,8381,0381,205
0,7850,9851,149
0,0310,0310,038
M1,6M1,8M2
0,80,81
2,62,63
1,5811,7811,981
1,4961,6961,886
1,3541,5541,721
1,2911,4911,654
0,0440,0440,050
M2,5M3M3,5
1,31,51,7
3,84,55
2,4802,9803,479
2,3802,8743,354
2,1882,6553,089
2,1172,5803,004
0,0560,0630,075
M4M5M6
22,53
67,59
3,9784,9765,974
3,8384,8265,794
3,5234,4565,324
3,4334,3615,212
0,0880,1000,125
M7M8M10
345
91215
6,9747,9729,968
6,7947,7609,732
6,3247,1608,994
6,2127,0428,862
0,1250,1560,188
M12M14M16
688
182424
11,96613,96215,962
11,70113,68215,682
10,82912,66314,663
10,67912,50314,503
0,2190,2500,250
M18M20M22
101010
303030
17,95819,95821,958
17,62319,62321,623
16,33418,33420,334
16,16418,16420,164
0,3130,3130,313
M24M27M30
121215
363645
23,95226,95229,947
23,57726,57729,522
22,00325,00327,674
21,80324,80327,462
0,3750,3750,438
M33M36M39
151818
455353
32,94735,94038,940
32,52235,46538,465
30,67433,34236,342
30,46233,11836,118
0,4380,5000,500
M42M45M48
212124
636371
41,93744,93747,929
41,43744,43747,399
39,01442,01444,681
38,77841,77844,431
0,5630,5630,625
M52M56M60
242828
718585
51,92955,92559,925
51,39955,36559,365
48,68152,35356,353
48,43152,08856,088
0,6250,6880,688
M64 32 95 63,920 63,320 60,023 59,743 0,750a See ISO 965-1.
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BS ISO 965-2:1998
4 © BSI 03-2000
5.3 Internal threads — Fine thread series
Table 3
Tolerance quality: medium
Thread engagement group: normal
Tolerance class: 6H
Dimensions in millimetres
Thread Length of thread engagement Pitch diameter D2
Minor diameter D1
over up to and including
max. min. max. min.
M8 × 1M10 × 1M10 × 1,25
344
91212
7,5009,5009,348
7,3509,3509,188
7,1539,1538,912
6,9178,9178,647
M12 × 1,25M12 × 1,5M14 × 1,5
4,54,55,6
131316
11,36811,21613,216
11,18811,02613,026
10,91210,67612,676
10,64710,37612,376
M16 × 1,5M18 × 1,5M18 × 2
5,65,65,6
161616
15,21617,21616,913
15,02617,02616,701
14,67616,67616,210
14,37616,37615,835
M20 × 1,5M20 × 2M22 × 1,5
5,65,65,6
161616
19,21618,91321,216
19,02618,70121,026
18,67618,21020,676
18,37617,83520,376
M22 × 2M24 × 2M27 × 2
5,68,58,5
162525
20,91322,92525,925
20,70122,70125,701
20,21022,21025,210
19,83521,83524,835
M30 × 2M33 × 2M36 × 3
8,58,5
12
252536
28,92531,92534,316
28,70131,70134,051
28,21031,21033,252
27,83530,83532,752
M39 × 3M42 × 3M45 × 3
121212
363636
37,31640,31643,316
37,05140,05143,051
36,25239,25242,252
35,75238,75241,752
M48 × 3M52 × 4M56 × 4
151919
455656
46,33149,71753,717
46,05149,40253,402
45,25248,27052,270
44,75247,67051,670
M60 × 4M64 × 4
1919
5656
57,71761,717
57,40261,402
56,27060,270
55,67059,670
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BS ISO 965-2:1998
© BSI 03-2000 5
5.4 External threads — Fine thread series
Table 4
Tolerance quality: medium
Thread engagement group: normal
Tolerance class: 6g
Dimensions in millimetres
Thread Length of thread engagement
Major diameter d
Pitch diameter d2
Root radius
over up to and including
max. min. max. min. min.a
M8 × 1M10 × 1M10 × 1,25
344
91212
7,9749,9749,972
7,7949,7949,760
7,3249,3249,160
7,2129,2129,042
0,1250,1250,156
M12 × 1,25M12 × 1,5M14 × 1,5
4,54,55,6
131316
11,97211,96813,968
11,76011,73213,732
11,16010,99412,994
11,02810,85412,854
0,1560,1880,188
M16 × 1,5M18 × 1,5M18 × 2
5,65,65,6
161616
15,96817,96817,962
15,73217,73217,682
14,99416,99416,663
14,85416,85416,503
0,1880,1880,250
M20 × 1,5M20 × 2M22 × 1,5
5,65,65,6
161616
19,96819,96221,968
19,73219,68221,732
18,99418,66320,994
18,85418,50320,854
0,1880,2500,188
M22 × 2M24 × 2M27 × 2
5,68,58,5
162525
21,96223,96226,962
21,68223,68226,682
20,66322,66325,663
20,50322,49325,493
0,2500,2500,250
M30 × 2M33 × 2M36 × 3
8,58,5
12
252536
29,96232,96235,952
29,68232,68235,577
28,66331,66334,003
28,49331,49333,803
0,2500,2500,375
M39 × 3M42 × 3M45 × 3
121212
363636
38,95241,95244,952
38,57741,57744,577
37,00340,00343,003
36,80339,80342,803
0,3750,3750,375
M48 × 3M52 × 4M56 × 4
151919
455656
47,95251,94055,940
47,57751,46555,465
46,00349,34253,342
45,79149,10653,106
0,3750,5000,500
M60 × 4M64 × 4
1919
5656
59,94063,940
59,46563,465
57,34261,342
57,10661,106
0,5000,500
a See ISO 965-1.
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BS ISO965-2:1998
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