1、BSI Standards PublicationBS ISO 965-1:2013ISO general purpose metricscrew threads TolerancesPart 1: Principles and basic dataBS ISO 965-1:2013 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 965-1:2013. Itsupersedes BS ISO 965-1:1998 which is withdrawn.The UK p
2、articipation in its preparation was entrusted to TechnicalCommittee FME/9, Fasteners.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its
3、correctapplication. The British Standards Institution 2013. Published by BSI StandardsLimited 2013ISBN 978 0 580 79213 7ICS 21.040.10Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Stra
4、tegy Committee on 30 September 2013.Amendments issued since publicationDate Text affectedBS ISO 965-1:2013 ISO 2013ISO general purpose metric screw threads Tolerances Part 1: Principles and basic dataFiletages mtriques ISO pour usages gnraux Tolrances Partie 1: Principes et donnes fondamentalesINTER
5、NATIONAL STANDARDISO965-1Fourth edition2013-09-15Reference numberISO 965-1:2013(E)BS ISO 965-1:2013ISO 965-1:2013(E)ii ISO 2013 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2013All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise
6、 in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCase p
7、ostale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 965-1:2013ISO 965-1:2013(E) ISO 2013 All rights reserved iiiContents PageForeword iv1 Scope . 12 Normative references 13 Terms, definitions and symbols 13.1 Term
8、s and definitions . 13.2 Symbols . 14 Tolerance system 25 Tolerance positions . 26 Tolerance grades 57 Lengths of thread engagement 98 Recommended tolerance classes 108.1 General 108.2 Tolerance quality 108.3 Preference order . 118.4 Combination of internal threads and external threads .118.5 Coated
9、 threads . 119 Multiple-start threads 1210 Formulae 1210.1 General 1210.2 Fundamental deviations 1210.3 Crest diameter tolerances 1310.4 Pitch diameter tolerances . 1410.5 Length of thread engagement . 1511 Root contours 1512 Designation .1712.1 General 1712.2 Designation of single-start screw threa
10、ds 1712.3 Designation of multiple-start screw threads .1912.4 Designation of left-hand threads 19Bibliography .20BS ISO 965-1:2013ISO 965-1:2013(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of
11、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,
12、 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.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/
13、IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2. www.iso.org/directivesAttention is drawn to the possibility that
14、some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent decl
15、arations received. www.iso.org/patentsAny trade name used in this document is information given for the convenience of users and does not constitute an endorsement.The committee responsible for this document is ISO/TC ISO 965-1 was prepared by Technical Committee ISO/TC 1, Screw Threads.This fourth
16、edition cancels and replaces the third edition (ISO 965-1:1998), which has been technically revised. It also incorporates the Technical Corrigendum ISO 965-1:1998/Cor.1:2009.ISO 965 consists of the following parts, under the general title ISO general purpose metric screw threads Tolerances: Part 1:
17、Principles and basic data Part 2: Limits of sizes for general purpose external and internal screw 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 screw threads tapped with tolerance posit
18、ion 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 galvanizingiv ISO 2013 All rights reservedBS ISO 965-1:2013INTERNATIONAL STANDARD ISO 965-1:2013(E)ISO general purpo
19、se metric screw threads Tolerances Part 1: Principles and basic data1 ScopeThis part of ISO 965 specifies a tolerance system for ISO general purpose metric screw threads (M) according to ISO 261.The tolerance system refers to the basic profile according to ISO 68-1.2 Normative referencesThe followin
20、g referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 68-1, ISO general purpose screw threads Basic profile Part
21、 1: Metric screw threadsISO 261, ISO general purpose metric screw threads General planISO 1502, ISO general-purpose metric screw threads Gauges and gaugingISO 5408, Screw threads Vocabulary3 Terms, definitions and symbols3.1 Terms and definitionsFor the purposes of this document, the terms and defin
22、itions given in ISO 5408 apply.3.2 SymbolsFor the purposes of this document, the following symbols apply.Symbol MeaningD basic major diameter of internal threadD1basic minor diameter of internal threadD2basic pitch diameter of internal threadd basic major diameter of external threadd1basic minor dia
23、meter of external threadd2basic pitch diameter of external threadd3minor diameter of external thread (see Figure 6)P pitch ISO 2013 All rights reserved 1BS ISO 965-1:2013ISO 965-1:2013(E)Ph leadH height of fundamental triangleS designation for “short” thread engagement groupN designation for “normal
24、” thread engagement groupL designation for “long” thread engagement groupT toleranceTD1, TD2, Td, Td2tolerances for D1, D2, d and d2ei, EI lower limit deviations (see Figure 1)es, ES upper limit deviations (see Figure 1)R root radius of external thread (see Figure 6)C root truncation of external thr
25、ead (see Figure 6)Figure 1 Position of tolerances with respect to zero line (basic size)4 Tolerance systemThe tolerance system consists of tolerance grades and tolerance positions. The tolerance grades are expressed by number, such as 4, 6 and 8. The tolerance positions are expressed by letter, such
26、 as H, G, h and g. The tolerance class designation shall be the combination of the number and the letter, for example 6H and 6g.5 Tolerance positionsThe following tolerance positions are standardized: for internal threads: G with positive fundamental deviation (EI), shown in Figure 2; 2 ISO 2013 All
27、 rights reservedBS ISO 965-1:2013ISO 965-1:2013(E) H with zero fundamental deviation (EI), shown in Figure 3. for external threads: a, b, c, d, e, f and g with negative fundamental deviation (es), shown in Figure 4; h with zero fundamental deviation (es), shown in Figure 5.The established tolerance
28、positions comply with the needs of coating thickness and with the demands of easy assembly.The fundamental deviations for internal threads and external threads are given in Table 1. ISO 2013 All rights reserved 3BS ISO 965-1:2013ISO 965-1:2013(E)Key1 basic profileKey1 basic profileFigure 2 Internal
29、threads with tolerance position GFigure 3 Internal threads with tolerance position HKey1 basic profileKey1 basic profileaApplication only in connection with minimum material limits (d2 min); see Clause 11, Figure 6.aApplication only in connection with minimum material limits (d2 min); see Clause 11,
30、 Figure 6.Figure 4 External threads with tolerance positions a, b, c, d, e, f and gFigure 5 External threads with tolerance position h4 ISO 2013 All rights reservedBS ISO 965-1:2013ISO 965-1:2013(E)Table 1 Fundamental deviations for internal threads and external threadsPitchPmmFundamental deviationI
31、nternal thread External threadGEImHEImaesmbesmcesmdesmeesmfesmgesmhesm0,20,250,3+17+18+180001718180000,350,40,45+19+19+200003434351919200000,50,60,7+20+21+220005053563636382021220000,750,81+22+24+26000290200130855660603838402224260001,251,51,75+28+32+3400029530031020521222013514014590951006367714245
32、4828323400022,53+38+42+480003153253352252352451501601701051101157180855258633842480003,544,5+53+60+63000345355365255265280180190200125130135909510070758053606300055,568+71+75+80+1000000375-38539542529030031034021222423626514015015518010611211814085909511871758010000006 Tolerance gradesThe tolerance
33、grades for the following screw thread diameters are standardized:Tolerance gradeD14, 5, 6, 7, 8d 4, 6, 8D24, 5, 6, 7, 8d23, 4, 5, 6, 7, 8, 9 ISO 2013 All rights reserved 5BS ISO 965-1:2013ISO 965-1:2013(E)Clause 8 shows details of tolerance grades and combinations of tolerance grades for pitch and c
34、rest diameters according to the tolerance quality and length of engagement group required, with the order of preference.In some grades, certain tolerance values for small pitches are not shown in tolerance tables because of insufficient thread overlap or the requirement that the pitch diameter toler
35、ance not exceed the crest diameter tolerance.The minor diameter tolerances of internal thread, TD1, are given in Table 2.Table 2 Minor diameter tolerances of internal thread (TD1)PitchPmmTolerance grade4m5m6m7m8m0,20,250,33845535667850,350,40,4563718080901001001121250,50,60,7901001121121251401401601
36、801802002240,750,811181251501501601901902002362362503003153751,251,51,7517019021221223626526530033533537542542547553022,532362803153003554003754505004755606306007108003,544,53553754254504755305606006707107508509009501 06055,5684504755006305606006308007107508001 0009009501 0001 2501 1201 1801 2501 60
37、0The major diameter tolerances of external thread, Td, are given in Table 3. The tolerance grades 5 and 7 do not exist for them.6 ISO 2013 All rights reservedBS ISO 965-1:2013ISO 965-1:2013(E)Table 3 Major diameter tolerances of external thread (Td)PitchPmmTolerance grade4m6m8m0,20,250,3364248566775
38、0,350,40,4553606385951000,50,60,76780901061251400,750,8190951121401501802362801,251,51,7513215017021223626533537542522,531802122362803353754505306003,544,526530031542547550067075080055,5683353553754505305606007108509009501 180The pitch diameter tolerances of internal thread, TD2, are given in Table
39、4.The pitch diameter tolerances of external thread, Td2, are given in Table 5.Table 4 Pitch diameter tolerances of internal thread (TD2)Basic major diameter DPitch P mmTolerance gradeover mmup to and including mm4 m5 m6 m7 m8 m0,99 1,40,2 0,25 0,340 45 48 56 60 75 1,4 2,80,2 0,25 0,35 0,4 0,4542 48
40、53 56 60 60 67 71 75 85 90 95 ISO 2013 All rights reserved 7BS ISO 965-1:2013ISO 965-1:2013(E)Basic major diameter DPitch P mmTolerance gradeover mmup to and including mm4 m5 m6 m7 m8 m2,8 5,60,35 0,5 0,6 0,7 0,75 0,856 63 71 75 75 8071 80 90 95 95 10090 100 112 118 118 125 125 140 150 150 160 2005,
41、6 11,20,75 1 1,25 1,585 95 100 112106 118 125 140132 150 160 180170 190 200 224 236 250 28011,2 22,41 1,25 1,5 1,75 2 2,5100 112 118 125 132 140125 140 150 160 170 180160 180 190 200 212 224200 224 236 250 265 280250 280 300 315 335 35522,4 451 1,5 2 3 3,5 4 4,5106 125 140 170 180 190 200132 160 180
42、 212 224 236 250170 200 224 265 280 300 315212 250 280 335 355 375 400 315 355 425 450 475 50045 901,5 2 3 4 5 5,5 6132 150 180 200 212 224 236170 190 224 250 265 280 300212 236 280 315 335 355 375265 300 355 400 425 450 475335 375 450 500 530 560 60090 1802 3 4 6 8160 190 212 250 280200 236 265 315
43、 355250 300 335 400 450315 375 425 500 560400 475 530 630 710180 3553 4 6 8212 236 265 300265 300 335 375335 375 425 475425 475 530 600530 600 670 750Table 5 Pitch diameter tolerances of external thread (Td2)Basic major diameter dPitch P mmTolerance gradeover mmup to and including mm3 m4 m5 m6 m7 m8
44、 m9 m0,99 1,40,2 0,25 0,324 26 2830 34 3638 42 4548 53 56 1,4 2,80,2 0,25 0,35 0,4 0,4525 28 32 34 3632 36 40 42 4540 45 50 53 5650 56 63 67 71 80 85 90 2,8 5,60,35 0,5 0,6 0,7 0,75 0,834 38 42 45 45 4842 48 53 56 56 6053 60 67 71 71 7567 75 85 90 90 9585 95 106 112 112 118 150 190Table 4 (continued
45、)8 ISO 2013 All rights reservedBS ISO 965-1:2013ISO 965-1:2013(E)Basic major diameter dPitch P mmTolerance gradeover mmup to and including mm3 m4 m5 m6 m7 m8 m9 m5,6 11,20,75 1 1,25 1,550 56 60 6763 71 75 8580 90 95 106100 112 118 132125 140 150 170 180 190 212 224 236 26511,2 22,41 1,25 1,5 1,75 2
46、2,560 67 71 75 80 8575 85 90 95 100 10695 106 112 118 125 132118 132 140 150 160 170150 170 180 190 200 212190 212 224 236 250 265236 265 280 300 315 33522,4 451 1,5 2 3 3,5 4 4,563 75 85 100 106 112 11880 95 106 125 132 140 150100 118 132 160 170 180 190125 150 170 200 212 224 236160 190 212 250 26
47、5 280 300200 236 265 315 335 355 375250 300 335 400 425 450 47545 901,5 2 3 4 5 5,5 680 90 106 118 125 132 140100 112 132 150 160 170 180125 140 170 190 200 212 224160 180 212 236 250 265 280200 224 265 300 315 335 355250 280 335 375 400 425 450315 355 425 475 500 530 56090 1802 3 4 6 895 112 125 15
48、0 170118 140 160 190 212150 180 200 236 265190 224 250 300 335236 280 315 375 425300 355 400 475 530375 450 500 600 670180 3553 4 6 8125 140 160 180160 180 200 224200 224 250 280250 280 315 355315 355 400 450400 450 500 560500 560 630 7107 Lengths of thread engagementThe lengths of thread engagement are classified into one of three groups: short (S), normal (N) or long (L), in accordance with Table 6.Table 6 Length groups of thread
