1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ICS 21.040.10 ISBN 0-626-14730-1 SANS 1700-2-18:2003 Edition 1 ISO 68-2:1998 Edition 1 SOUTH AFRICAN NATIONAL STANDARD Fasteners Part 2: Screw threads Se
4、ction 18: ISO general purpose screw threads Basic profile Inch screw threads This national standard is the identical implementation of ISO 68-2:1998 and is adopted with the permission of the International Organization for Standardisation. Published by Standards South Africa 1 dr lategan road groenkl
5、oof private bag x191 pretoria 0001 tel: 012 428 7911 fax: 012 344 1568 international code + 27 12 www.stansa.co.za Standards South Africa 2003 SANS 1700-2-18:2003 Edition 1 ISO 68-2:1998 Edition 1 Table of changes Change No. Date Scope National foreword This South African standard was approved by Na
6、tional Committee STANSA TC 5120.01, Screw threads and fasteners, in accordance with procedures of Standards South Africa, in compliance with annex 3 of the WTO/TBT agreement. AReference numberISO 68-2:1998(E)INTERNATIONALSTANDARDISO68-2First edition1998-12-15ISO general purpose screw threads Basic p
7、rofile Part 2:Inch screw threadsFiletages ISO pour usages gnraux Profil de base Partie 2: Filetages en inchesISO 68-2:1998(E) ISO 1998All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronicor mechanical, inclu
8、ding photocopying and microfilm, without permission in writing from the publisher.International Organization for StandardizationCase postale 56 CH-1211 Genve 20 SwitzerlandInternet isoiso.chPrinted in SwitzerlandiiForewordISO (the International Organization for Standardization) is a worldwide federa
9、tion of national standards bodies (ISOmember bodies). The work of preparing International Standards is normally carried out through ISO technicalcommittees. Each member body interested in a subject for which a technical committee has been established hasthe right to be represented on that committee.
10、 International organizations, governmental and non-governmental, inliaison with ISO, also take part in the work. ISO collaborates closely with the International ElectrotechnicalCommission (IEC) on all matters of electrotechnical standardization.Draft International Standards adopted by the technical
11、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 68-2 was prepared by Technical Committee ISO/TC 1, Screw threads, SubcommitteeSC 1, Basic data.This fir
12、st edition, together with ISO 68-1, cancels and replaces ISO 68:1973 which has been technically revised byseparating the metric dimensions from the imperial dimensions.ISO 68 consists of the following parts under the general title ISO general purpose screw threads Basic profile Part 1: Metric screw
13、threads Part 2: Inch screw threadsAnnex of this part of ISO 68 is for information only.INTERNATIONAL STANDARD ISO ISO 68-2:1998(E)1ISO general purpose screw threads Basic profile Part 2:Inch screw threads1 ScopeThis part of ISO 68 specifies the basic profile for ISO inch screw threads.2 Normative re
14、ferencesThe following standards contain provisions which, through reference in this text, constitute provisions of this part ofISO 68. At the time of publication the editions indicated were valid. All standards are subject to revision and partiesto agreements based on this part of ISO 68 are encoura
15、ged to investigate the possibility of applying the most recenteditions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid InternationalStandards.ISO 5408:1983, Cylindrical screw threads Vocabulary.ISO 5864:1993, ISO inch screw threads Allowances and tolera
16、nces.3 DefinitionsFor the purpose of this part of ISO 68 the definitions given in ISO 5408 apply. Only the term “basic profile“ which might beusefully restated is defined below.3.1basic profileThe theoretical profile of a screw thread in an axial plane defined by theoretical dimensions and angles co
17、mmon tointernal and external threadsNOTE The basic profile is shown as a thick line in figure 1.ISO 68-2:1998(E)ISO2whereDdD2d2D1d1HPis the basic major diameter of internal thread (nominal diameter)is the basic major diameter of external thread (nominal diameter)is the basic pitch diameter of intern
18、al threadis the basic pitch diameter of external threadis the basic minor diameter of internal threadis the basic minor diameter of external threadis the height of fundamental triangleis the pitchFigure 1 4 DimensionsThe fundamental deviations and tolerances specified in ISO 5864 are applied to the
19、dimensions of the basic profileshown in figure 1 and derived from table 1.Hn=0 866 025 404,580 541 265 877Hn=,380 324 759 526Hn=,Hn40 216 506 351=,Hn80108 253 175=,where n is the number of threads per inch.ISOISO 68-2:1998(E)3Table 1 Dimensions in inchesNumberofthreadsper inchnPitchPH58H38HH4H880726
20、456484440363228242018161413121110987654,540,012 5000,013 8890,015 6250,017 8570,020 8330,022 7270,025 0000,027 7780,031 2500,035 7140,041 6670,050 0000,055 5560,062 5000,071 4290,076 9230,083 3330,090 9090,100 0000,111 1110,125 0000,142 8570,166 6670,200 0000,222 2220,250 0000,010 8250,012 0280,013
21、5320,015 4650,018 0420,019 6820,021 6510,024 0560,027 0630,030 9290,036 0840,043 3010,048 1130,054 1270,061 8590,066 6170,072 1690,078 7300,086 6030,096 2250,108 2530,123 7180,144 3380,173 2050,192 4500,216 5060,006 7660,007 5180,008 4570,009 6650,011 2760,012 3010,013 5320,015 0350,016 9150,019 331
22、0,022 5530,027 0630,030 0700,033 8290,038 6620,041 6360,045 1050,049 2060,054 1270,060 1410,067 6580,077 3240,090 2110,108 2530,120 2810,135 3160,004 0590,004 5110,005 0740,005 7990,006 7660,007 3810,008 1190,009 0210,010 1490,011 5990,013 5320,016 2380,018 0420,020 2970,023 1970,024 9820,027 0630,0
23、29 5240,032 4760,036 0840,040 5950,046 3940,054 1270,064 9520,072 1690,081 1900,002 7060,003 0070,003 3830,003 8660,004 5110,004 9210,005 4130,006 0140,006 7660,007 7320,009 0210,010 8250,012 0280,013 5320,015 4650,016 6540,018 0420,019 6820,021 6510,024 0560,027 0630,030 9290,036 0840,043 3010,048
24、1130,054 1270,001 3530,001 5040,001 6910,001 9330,002 2550,002 4600,002 7060,003 0070,003 3830,003 8660,004 5110,005 4130,006 0140,006 7660,007 7320,008 3270,009 0210,009 8410,010 8250,012 0280,013 5320,015 4650,018 0420,021 6510,024 0560,027 063ISO 68-2:1998(E)ISO4Annex A(informative)Table 1 values
25、 converted into metric unitsDimensions in millimetresNumber ofthreadsper inchnPitchPH58H38HH4H880 0,317 500 0,274 955 0,171 856 0,103 099 0,068 732 0,034 36672 0,352 781 0,305 511 0,190 957 0,114 579 0,076 378 0,038 20264 0,396 875 0,343 713 0,214 808 0,128 880 0,085 928 0,042 95156 0,453 568 0,392
26、811 0,245 491 0,147 295 0,098 196 0,049 09848 0,529 158 0,458 267 0,286 410 0,171 856 0,114 579 0,057 27744 0,577 266 0,499 923 0,312 445 0,187 477 0,124 993 0,062 48440 0,635 000 0,549 935 0,343 713 0,206 223 0,137 490 0,068 73236 0,705 561 0,611 022 0,381 889 0,229 133 0,152 756 0,076 37832 0,793
27、750 0,687 400 0,429 641 0,257 785 0,171 856 0,085 92828 0,907 136 0,785 597 0,491 007 0,294 615 0,196 393 0,098 19624 1,058 342 0,916 534 0,572 846 0,343 713 0,229 133 0,114 57920 1,270 000 1,099 845 0,687 400 0,412 445 0,274 955 0,137 49018 1,411 122 1,222 070 0,763 778 0,458 267 0,305 511 0,152 75
28、616 1,587 500 1,374 826 0,859 257 0,515 544 0,343 713 0,171 85614 1,814 297 1,571 219 0,982 015 0,589 204 0,392 811 0,196 39313 1,953 844 1,692 072 1,057 554 0,634 543 0,423 012 0,211 50612 2,116 658 1,833 093 1,145 667 0,687 400 0,458 267 0,229 13311 2,309 089 1,999 742 1,249 832 0,749 910 0,499 92
29、3 0,249 96110 2,540 000 2,199 716 1,374 826 0,824 890 0,549 935 0,274 9559 2,822 219 2,444 115 1,527 581 0,916 534 0,611 022 0,305 5118 3,175 000 2,749 626 1,718 513 1,031 113 0,687 400 0,343 7137 3,628 568 3,142 437 1,964 030 1,178 408 0,785 597 0,392 8116 4,233 342 3,666 185 2,291 359 1,374 826 0,916 534 0,458 2675 5,080 000 4,399 407 2,749 626 1,649 781 1,099 845 0,549 9354,5 5,644 439 4,888 230 3,055 137 1,833 093 1,222 070 0,611 0224 6,350 000 5,499 252 3,437 026 2,062 226 1,374 826 0,687 400
