SANS 1700-2-19-2003 Fasteners Part 2 Screw threads Section 19 ISO general purpose metric screw threads - Tolerances - Limits of sizes for hot-dip galvanized external screw threads th.pdf

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 0-626-14731-X SANS 1700-2-19:2003 Edition 1 ISO 965-4:1998 Edition 1 SOUTH AFRICAN NATIONAL STANDARD Fasteners Part 2: Screw threads S

4、ection 19: ISO general purpose metric screw threads Tolerances Limits of sizes for hot-dip galvanized external screw threads to mate with internal screw threads tapped with tolerance position H or G after galvanizing This national standard is the identical implementation of ISO 965-4:1998 and is ado

5、pted with the permission of the International Organization for Standardisation. Published by Standards South Africa 1 dr lategan road groenkloof 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 1700-2-19:2

6、003 Edition 1 ISO 965-4:1998 Edition 1 Table of changes Change No. Date Scope National foreword This South African standard was approved by National Committee STANSA TC 5120.01, Screw threads and fasteners, in accordance with procedures of Standards South Africa, in compliance with annex 3 of the WT

7、O/TBT agreement. AReference numberISO 965-4:1998(E)INTERNATIONALSTANDARDISO965-4First edition1998-12-15ISO general purpose metric screwthreads Tolerances Part 4:Limits of sizes for hot-dip galvanized externalscrew threads to mate with internal screwthreads tapped with tolerance position H or Gafter

8、galvanizingFiletages mtriques ISO pour usages gnraux Tolrances Partie 4: Dimensions limites pour filetages extrieurs galvaniss chaudpour assemblages avec des filetages intrieurs de position de tolrance Hou G aprs galvanisationISO 965-4:1998(E) ISO 1998All rights reserved. Unless otherwise specified,

9、 no part of this publication may be reproduced or utilized in any form or by any means, electronicor mechanical, including photocopying and microfilm, without permission in writing from the publisher.International Organization for StandardizationCase postale 56 CH-1211 Genve 20 SwitzerlandInternet i

10、soiso.chPrinted in SwitzerlandiiForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISOmember bodies). The work of preparing International Standards is normally carried out through ISO technicalcommittees. Each member body interest

11、ed in a subject for which a technical committee has been established hasthe right to be represented on that committee. International organizations, governmental and non-governmental, inliaison with ISO, also take part in the work. ISO collaborates closely with the International ElectrotechnicalCommi

12、ssion (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.Internationa

13、l Standard ISO 965-4 was prepared by Technical Committee ISO/TC 1, Screw threads, SubcommitteeSC 2, Tolerances.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 pu

14、rpose 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 withtolerance position H or G after galvanizing Part 5: Limits of sizes for internal screw threads to mat

15、e with hot-dip galvanized external screw threads withmaximum size of tolerance position h before galvanizingINTERNATIONAL STANDARD ISO ISO 965-4:1998(E)1ISO general purpose metric screw threads Tolerances Part 4:Limits of sizes for hot-dip galvanized external screw threads to matewith internal screw

16、 threads tapped with tolerance position H or G aftergalvanizing1 ScopeThis part of ISO 965 specifies deviations and limits of sizes for pitch and crest diameters for ISO general purposemetric external screw threads conforming to ISO 262 having a basic profile according to ISO 68-1.External screw thr

17、eads according to this part of ISO 965 are intended to mate with internal screw threads tappedwith tolerance position H or G after hot dip galvanizing.The limits of sizes for the tolerance quality specified are derived from tolerances specified in ISO 965-1 and thefundamental deviations according to

18、 the following formula:esaz= 2(300 + 20P)wherees is expressed in micrometres;P is expressed in millimetres.Products made with thread tolerances in accordance with this part of ISO 965 may show failure at lower ultimatetensile loads than those specified in ISO 898-1 due to reduction of the stress are

19、a.External screw threads with thread tolerances according to this part of ISO 965 must not be mated with internalscrew threads with thread tolerances according to ISO 965-5 because such combinations will create severe risk forthread stripping.NOTE If the tolerance class 6az is not specified the exte

20、rnal screw threads are to mate with internal screw threads withtolerance position 6AZ if the products are centrifuged and with hot-dip galvanized internal screw threads with tolerance position6AX if the products are not centrifuged.2 Normative referencesThe following standards contain provisions whi

21、ch, through reference in this text, constitute provisions of this part ofISO 965. At the time of publication, the editions indicated were valid. All standards are subject to revision, andparties to agreements based on this part of ISO 965 are encouraged to investigate the possibility of applying the

22、most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently validInternational 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

23、 for screws, bolts and nuts.ISO 965-4:1998(E) ISO2ISO 898-1:1), Mechanical properties of fasteners made of carcon steel and alloy steel Part 1: Bolts, screwsand studs.ISO 965-1:1998, ISO general purpose metric screw threads Tolerances Part 1: Principles and basic data.ISO 965-5:1998, ISO general pur

24、pose metric screw threads Tolerances Part 5: Limits of sizes for internalscrew threads to mate with hot-dip galvanized external screw threads with maximum size of tolerance position hbefore galvanizing.ISO 5408:1983, Cylindrical screw threads Vocabulary.3 DefinitionsFor the purposes of this part of

25、ISO 965 the definitions given in ISO 5408 apply.4 DesignationTolerance designation for external screw threads is 6az.Example:M12-6az1) To be published. (Revision of ISO 898-1:1988) ISOISO 965-4:1998(E)35 DeviationsThe deviations for external screw threads as specified in table 1 are derived from the

26、 formula for fundamentaldeviations below and from tolerances specified in ISO 965-1.The fundamental deviations, esaz, have been calculated according to the following formula:esaz= 2 (300 + 20P).whereesaz is expressed in micrometres;P is expressed in millimetresTable 1 DeviationsThread Pitch External

27、 thread tolerance class 6azP Pitch diameter Major diameter MinordiametermmesmeimesmeimDeviationsfor stresscalculationmM10 1,5 2 330 2 462 2 330 2 566 2 547M12 1,75 2 335 2 485 2 335 2 600 2 588M14, M16 2 2 340 2 500 2 340 2 620 2 629M18, M20, M22 2,5 2 350 2 520 2 350 2 685 2 711M24, M27 3 2 360 2 5

28、60 2 360 2 735 2 793M30, M33 3,5 2 370 2 582 2 370 2 795 2 875M36, M39 4 2 380 2 604 2 380 2 855 2 957M42, M45 4,5 2 390 2 626 2 390 2 890 2 1 040M48, M52 5 2 400 2 650 2 400 2 930 2 1 122M56, M60 5,5 2 410 2 675 2 410 2 970 2 1 204M64 6 2 420 2 700 2 420 2 1 020 2 1 286ISO 965-4:1998(E) ISO46 Limit

29、s of sizes External screw threads Coarse thread seriesTolerance quality: mediumThread engagement group: normalTolerance class: 6azThe actual root contour shall not at any point transgress the basic profile.For hot-dip galvanized screw threads, the tolerances apply to the parts before galvanizing. Af

30、ter galvanizing, theactual thread profile shall not at any point transgress the maximum material limits for tolerance position h and areintended to mate with internal screw threads of tolerance position H or G only.Table 2 External thread limits for tolerance class 6azDimensions in millimetresThread

31、 Length of threadengagementMajor diameter Pitch diameter Minordiameter(for stresscalculation)Rootradiusover up toandincludingmax. min. max. min. max. min.M10M12M145681518249,67011,66513,6609,43411,40013,3808,69610,52812,3618,56410,37812,2017,8299,51811,2060,1880,2190,250M16M18M208101024303015,66017,

32、65019,65015,38017,31519,31514,36116,02618,02614,20115,85617,85613,20614,58316,5830,2500,3130,313M22M24M2710121230363621,65023,64026,64021,31523,26526,26520,02621,69124,69119,85621,49124,49118,58319,95922,9590,3130,3750,375M30M33M3615151845455329,63032,63035,62029,20532,20535,14527,35730,35733,02227,

33、14530,14532,79825,33628,33630,7130,4380,4380,500M39M42M4518212153636338,62041,61044,61038,14541,11044,11036,02238,68741,68735,79838,45141,45133,71336,08939,0890,5000,5630,563M48M52M5624242871718547,60051,60055,59047,07051,07055,03044,35248,35252,01844,10248,10251,75341,46545,46548,8420,6250,6250,688M60M642832859559,59063,58059,03062,98056,01859,68355,75359,40352,84256,2190,6880,750