1、BSI Standards Publication BS ISO 965-1:2013 ISO general purpose metric screw threads Tolerances Part 1: Principles and basic dataBS ISO 965-1:2013 BRITISH STANDARD National foreword This British Standard is the UK implementation of ISO 965-1:2013. It supersedes BS ISO 965-1:1998 which is withdrawn.
2、The UK participation in its preparation was entrusted to Technical Committee FME/9, Fasteners. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are respons
3、ible for its correct application. The British Standards Institution 2013. Published by BSI Standards Limited 2013 ISBN 978 0 580 79213 7 ICS 21.040.10 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Stan
4、dards Policy and Strategy Committee on 30 September 2013. Amendments issued since publication Date Text affectedBS ISO 965-1:2013 ISO 2013 ISO general purpose metric screw threads Tolerances Part 1: Principles and basic data Filetages mtriques ISO pour usages gnraux Tolrances Partie 1: Principes et
5、donnes fondamentales INTERNATIONAL STANDARD ISO 965-1 Fourth edition 2013-09-15 Reference number ISO 965-1:2013(E)BS ISO 965-1:2013ISO 965-1:2013(E)ii ISO 2013 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2013 All rights reserved. Unless otherwise specified, no part of this publication may b
6、e reproduced or utilized otherwise 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 re
7、quester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in SwitzerlandBS ISO 965-1:2013ISO 965-1:2013(E) ISO 2013 All rights reserved iii Contents Page Foreword iv 1 Scope . 1 2 Normative reference
8、s 1 3 T erms, definitions and s ymbols 1 3.1 Terms and definitions . 1 3.2 Symbols . 1 4 T oler anc e s y st em 2 5 Tolerance positions . 2 6 Tolerance grades 5 7 Lengths of thread engagement 9 8 Recommended tolerance classes 10 8.1 General 10 8.2 Tolerance quality 10 8.3 Preference order .11 8.4 Co
9、mbination of internal threads and external threads .11 8.5 Coated threads .11 9 Multiple-start threads 12 10 Formulae 12 10.1 General 12 10.2 Fundamental deviations 12 10.3 Crest diameter tolerances 13 10.4 Pitch diameter tolerances .14 10.5 Length of thread engagement .15 11 Root contours 15 12 Des
10、ignation .17 12.1 General 17 12.2 Designation of single-start screw threads 17 12.3 Designation of multiple-start screw threads .19 12.4 Designation of left-hand threads 19 Bibliogr aph y .20BS ISO 965-1:2013ISO 965-1:2013(E) Foreword ISO (the International Organization for Standardization) is a wor
11、ldwide 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
12、 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. The procedures used to develop this
13、document and those intended for its further maintenance are described in the ISO/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 Dire
14、ctives, Part 2. www.iso.org/directives Attention is drawn to the possibility that 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
15、 of the document will be in the Introduction and/or on the ISO list of patent declarations received. www.iso.org/patents Any 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/T
16、C ISO 965-1 was prepared by Technical Committee ISO/TC 1, Screw Threads. This fourth 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,
17、 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 external and internal screw threads Medium quality Part 3: Deviations for constructional screw threads Part 4: Limits of sizes for hot-dip galva
18、nized external threads to mate with internal screw 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 galvanizingiv ISO 2013 All rig
19、hts reservedBS ISO 965-1:2013INTERNATIONAL ST ANDARD ISO 965-1:2013(E) ISO general purpose metric screw threads Tolerances Part 1: Principles and basic data 1 Scope This part of ISO 965 specifies a tolerance system for ISO general purpose metric screw threads (M) according to ISO 261. The tolerance
20、system refers to the basic profile according to ISO 68-1. 2 Normative references The following 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 (inc
21、luding any amendments) applies. ISO 68-1, ISO general purpose screw threads Basic profile Part 1: Metric screw threads ISO 261, ISO general purpose metric screw threads General plan ISO 1502, ISO general-purpose metric screw threads Gauges and gauging ISO 5408, Screw threads Vocabulary 3 T erms, d e
22、finitions and s ymbols 3.1 T erms and definiti ons For the purposes of this document, the terms and definitions given in ISO 5408 apply. 3.2 S ymbols For the purposes of this document, the following symbols apply. S y mb ol Meaning D basic major diameter of internal thread D 1 basic minor diameter o
23、f internal thread D 2 basic pitch diameter of internal thread d basic major diameter of external thread d 1 basic minor diameter of external thread d 2 basic pitch diameter of external thread d 3 minor diameter of external thread (see Figure 6) P pitch ISO 2013 All rights reserved 1BS ISO 965-1:2013
24、ISO 965-1:2013(E) Ph lead H height of fundamental triangle S designation for “short” thread engagement group N designation for “normal” thread engagement group L designation for “long” thread engagement group T tolerance T D1 , T D2 , T d , T d2 tolerances for D 1 , D 2 , d and d 2 ei, EI lower limi
25、t 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 thread (see Figure 6) Figure 1 Position of tolerances with respect to zero line (basic size) 4 T oler anc e s y st em The tolerance system consists o
26、f 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 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 Tolera
27、nce positions The following tolerance positions are standardized: for internal threads: G with positive fundamental deviation (EI), shown in Figure 2; 2 ISO 2013 All rights reservedBS ISO 965-1:2013ISO 965-1:2013(E) H with zero fundamental deviation (EI), shown in Figure 3. for external threads: a,
28、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 positions comply with the needs of coating thickness and with the demands of easy assembly. The fundamental deviations for internal th
29、reads and external threads are given in Table 1. ISO 2013 All rights reserved 3BS ISO 965-1:2013ISO 965-1:2013(E) K ey 1 basic profile K ey 1 basic profile Figure 2 Internal threads with tolerance position G Figure 3 Internal threads with tolerance position H K ey 1 basic profile K ey 1 basic profil
30、e aApplication only in connection with minimum material limits (d 2 min ); see Clause 11, Figure 6. aApplication only in connection with minimum material limits (d 2 min ); see Clause 11, Figure 6. Figure 4 External threads with tolerance positions a, b, c, d, e, f and g Figure 5 External threads wi
31、th 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 threads Pitch P mm Fundamental deviation Internal thread External thread G EI m H EI m a es m b es m c es m d es m e es m f es m g es m h es m 0,2
32、0,25 0,3 +17 +18 +18 0 0 0 17 18 18 0 0 0 0,35 0,4 0,45 +19 +19 +20 0 0 0 34 34 35 19 19 20 0 0 0 0,5 0,6 0,7 +20 +21 +22 0 0 0 50 53 56 36 36 38 20 21 22 0 0 0 0,75 0,8 1 +22 +24 +26 0 0 0 290 200 130 85 56 60 60 38 38 40 22 24 26 0 0 0 1,25 1,5 1,75 +28 +32 +34 0 0 0 295 300 310 205 212 220 135 14
33、0 145 90 95 100 63 67 71 42 45 48 28 32 34 0 0 0 2 2,5 3 +38 +42 +48 0 0 0 315 325 335 225 235 245 150 160 170 105 110 115 71 80 85 52 58 63 38 42 48 0 0 0 3,5 4 4,5 +53 +60 +63 0 0 0 345 355 365 255 265 280 180 190 200 125 130 135 90 95 100 70 75 80 53 60 63 0 0 0 5 5,5 6 8 +71 +75 +80 +100 0 0 0 0
34、 375 -385 395 425 290 300 310 340 212 224 236 265 140 150 155 180 106 112 118 140 85 90 95 118 71 75 80 100 0 0 0 0 6 Tolerance grades The tolerance grades for the following screw thread diameters are standardized:Tolerance grade D 1 4, 5, 6, 7, 8 d 4, 6, 8 D 2 4, 5, 6, 7, 8 d 2 3, 4, 5, 6, 7, 8, 9
35、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 crest diameters according to the tolerance quality and length of engagement group required, with the order of preference. In some grades, cer
36、tain tolerance values for small pitches are not shown in tolerance tables because of insufficient thread overlap or the requirement that the pitch diameter tolerance not exceed the crest diameter tolerance. The minor diameter tolerances of internal thread, T D1 , are given in Table 2. Table 2 Minor
37、diameter tolerances of internal thread (T D1 ) Pitch P mm Tolerance grade 4 m 5 m 6 m 7 m 8 m0,20,250,3 38 45 53 56 67 85 0,350,40,45 63 71 80 80 90 100 100 112 125 0,50,60,7 90 100 112 112 125 140 140 160 180 180 200 224 0,750,81 118 125 150 150 160 190 190 200 236 236 250 300 315 3751,251,51,75 17
38、0 190 212 212 236 265 265 300 335 335 375 425 425 475 53022,53 236 280 315 300 355 400 375 450 500 475 560 630 600 710 8003,544,5 355 375 425 450 475 530 560 600 670 710 750 850 900 950 1 06055,568 450 475 500 630 560 600 630 800 710 750 800 1 000 900 950 1 000 1 250 1 120 1 180 1 250 1 600 The majo
39、r diameter tolerances of external thread, T d , 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 (T d ) Pitch P mm Tolerance grade 4 m 6 m 8 m0,20,250,3 36 42
40、 48 56 67 75 0,350,40,45 53 60 63 85 95 100 0,50,60,7 67 80 90 106 125 140 0,750,81 90 95 112 140 150 180 236 2801,251,51,75 132 150 170 212 236 265 335 375 42522,53 180 212 236 280 335 375 450 530 6003,544,5 265 300 315 425 475 500 670 750 80055,568 335 355 375 450 530 560 600 710 850 900 950 1 180
41、 The pitch diameter tolerances of internal thread, T D2 , are given in Table 4. The pitch diameter tolerances of external thread, T d2 , are given in Table 5. Table 4 Pitch diameter tolerances of internal thread (T D2 ) Basic major diameter DPitch P mm Tolerance grade over mm up to and including mm
42、4 m 5 m 6 m 7 m 8 m 0,99 1,4 0,2 0,25 0,3 40 45 48 56 60 75 1,4 2,8 0,2 0,25 0,35 0,4 0,45 42 48 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 mm Tolerance grade over mm up to and including mm 4 m 5 m 6 m 7 m 8 m 2,8 5,6
43、0,35 0,5 0,6 0,7 0,75 0,8 56 63 71 75 75 80 71 80 90 95 95 100 90 100 112 118 118 125 125 140 150 150 160 200 5,6 11,2 0,75 1 1,25 1,5 85 95 100 112 106 118 125 140 132 150 160 180 170 190 200 224 236 250 280 11,2 22,4 1 1,25 1,5 1,75 2 2,5 100 112 118 125 132 140 125 140 150 160 170 180 160 180 190
44、 200 212 224 200 224 236 250 265 280 250 280 300 315 335 355 22,4 45 1 1,5 2 3 3,5 4 4,5 106 125 140 170 180 190 200 132 160 180 212 224 236 250 170 200 224 265 280 300 315 212 250 280 335 355 375 400 315 355 425 450 475 500 45 90 1,5 2 3 4 5 5,5 6 132 150 180 200 212 224 236 170 190 224 250 265 280
45、 300 212 236 280 315 335 355 375 265 300 355 400 425 450 475 335 375 450 500 530 560 600 90 180 2 3 4 6 8 160 190 212 250 280 200 236 265 315 355 250 300 335 400 450 315 375 425 500 560 400 475 530 630 710 180 355 3 4 6 8 212 236 265 300 265 300 335 375 335 375 425 475 425 475 530 600 530 600 670 75
46、0 Table 5 Pitch diameter tolerances of external thread (T d2 ) Basic major diameter dPitch P mm Tolerance grade over mm up to and including mm 3 m 4 m 5 m 6 m 7 m 8 m 9 m 0,99 1,4 0,2 0,25 0,3 24 26 28 30 34 36 38 42 45 48 53 56 1,4 2,8 0,2 0,25 0,35 0,4 0,45 25 28 32 34 36 32 36 40 42 45 40 45 50 5
47、3 56 50 56 63 67 71 80 85 90 2,8 5,6 0,35 0,5 0,6 0,7 0,75 0,8 34 38 42 45 45 48 42 48 53 56 56 60 53 60 67 71 71 75 67 75 85 90 90 95 85 95 106 112 112 118 150 190Table 4 (continued) 8 ISO 2013 All rights reservedBS ISO 965-1:2013ISO 965-1:2013(E) Basic major diameter dPitch P mm Tolerance grade ov
48、er mm up to and including mm 3 m 4 m 5 m 6 m 7 m 8 m 9 m 5,6 11,2 0,75 1 1,25 1,5 50 56 60 67 63 71 75 85 80 90 95 106 100 112 118 132 125 140 150 170 180 190 212 224 236 265 11,2 22,4 1 1,25 1,5 1,75 2 2,5 60 67 71 75 80 85 75 85 90 95 100 106 95 106 112 118 125 132 118 132 140 150 160 170 150 170 180 190 200 212 190 212 22
