1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 7041:2012Prevailing torque type hexagonnuts (with non-metallic insert),style 2 Property classes 9and 12BS ISO 7041:2012 BRITISH STANDARDNational forewordThis British Stand
2、ard is the UK implementation of ISO 7041:2012. Itsupersedes BS ISO 7041:2002 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee FME/9/3, Fasteners - Product Standards.A list of organizations represented on this committee can beobtained on request to its se
3、cretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2012. Published by BSI StandardsLimited 2012ISBN 978 0 580 77982 4ICS 21.060.20Compliance with a British Standard cannot
4、 confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 June 2012.Amendments issued since publicationDate T e x t a f f e c t e dBS ISO 7041:2012 ISO 2012Prevailing torque type hexagon nuts (with non-metallic
5、insert), style 2 Property classes 9 and 12crous hexagonaux autofreins ( anneau non mtallique), style 2 Classes de qualit 9 et 12INTERNATIONAL STANDARDISO7041Fourth edition2012-05-15Reference numberISO 7041:2012(E)BS ISO 7041:2012ISO 7041:2012(E)ii ISO 2012 All rights reservedCOPYRIGHT PROTECTED DOCU
6、MENT ISO 2012All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body
7、in the country of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 7041:2012ISO 7041:2012(E)ForewordISO (the International Organization for Standardization) is a worldwid
8、e 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
9、 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.International Standards are drafted in acc
10、ordance with the rules given in the ISO/IEC Directives, Part 2.The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requi
11、res approval by at least 75 % of the member bodies casting a vote.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.ISO 7041 was prepared by Technical C
12、ommittee ISO/TC 2, Fasteners, Subcommittee SC 12, Fasteners with metric internal thread.This fourth edition cancels and replaces the third edition (ISO 7041:2002), of which it constitutes a minor revision. ISO 2012 All rights reserved iiiBS ISO 7041:2012BS ISO 7041:2012Prevailing torque type hexagon
13、 nuts (with non-metallic insert), style 2 Property classes 9 and 121 ScopeThis International Standard specifies the characteristics of prevailing torque type hexagon nuts (with non-metallic insert), style 2, with threads from M5 up to and including M36, in product grade A for threads up to and inclu
14、ding M16, and product grade B for threads above M16, and with property classes 9 and 12.NOTE The dimensions of the nuts correspond to those given in ISO 4033 plus prevailing torque feature.If other specifications are required, they can be selected from existing International Standards, e.g. ISO 261,
15、 ISO 724, ISO 898-2, ISO 965-2, ISO 2320 and ISO 4759-1.2 Normative referencesThe 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 (includ
16、ing any amendments) applies.ISO 225, Fasteners Bolts, screws, studs and nuts Symbols and descriptions of dimensionsISO 261, ISO general purpose metric screw threads General planISO 724, ISO general-purpose metric screw threads Basic dimensionsISO 898-2, Mechanical properties of fasteners made of car
17、bon steel and alloy steel Part 2: Nuts with specified property classes Coarse thread and fine pitch threadISO 965-2, ISO general purpose metric screw threads Tolerances Part 2: Limits of sizes for general purpose external and internal screw threads Medium qualityISO 2320, Prevailing torque type stee
18、l nuts Mechanical and performance propertiesISO 3269, Fasteners Acceptance inspectionISO 4042, Fasteners Electroplated coatingsISO 4759-1, Tolerances for fasteners Part 1: Bolts, screws, studs and nuts Product grades A, B and CISO 6157-2, Fasteners Surface discontinuities Part 2: NutsISO 8992, Faste
19、ners General requirements for bolts, screws, studs and nutsISO 10683, Fasteners Non-electrolytically applied zinc flake coatingsINTERNATIONAL STANDARD ISO 7041:2012(E) ISO 2012 All rights reserved 1BS ISO 7041:2012ISO 7041:2012(E)3 DimensionsSee Figure 1 and Table 1.Symbols and descriptions of dimen
20、sions are specified in ISO 225.aPrevailing torque element; the shape is at the discretion of the manufacturer.b = 15 to 30.c = 90 to 120.Figure 1Table 1 DimensionsDimensions in millimetresThread DM5 M6 M8 M10 M12 (M14)aM16 M20 M24 M30 M36Pb0,8 1 1,25 1,5 1,75 2 2 2,5 3 3,5 4damax. 5,75 6,75 8,75 10,
21、80 13,00 15,10 17,30 21,60 25,90 32,40 38,90min. 5,00 6,00 8,00 10,00 12,00 14,00 16,00 20,00 24,00 30,00 36,00dwmin. 6,88 8,88 11,63 14,63 16,63 19,64 22,49 27,70 33,25 42,75 51,11e min. 8,79 11,05 14,38 17,77 20,03 23,36 26,75 32,95 39,55 50,85 60,79hmax. 7,20 8,50 10,20 12,80 16,10 18,30 20,70 25
22、,10 29,50 35,60 42,60min. 6,62 7,92 9,50 12,10 15,40 17,00 19,40 23,00 27,40 33,10 40,10mcmin. 4,80 5,40 7,14 8,94 11,57 13,40 15,70 19,00 22,60 27,30 33,10mwdmin. 3,84 4,32 5,71 7,15 9,26 10,70 12,60 15,20 18,10 21,80 26,50smax. 8,00 10,00 13,00 16,00 18,00 21,00 24,00 30,00 36,00 46,00 55,00min. 7
23、,78 9,78 12,73 15,73 17,73 20,67 23,67 29,16 35,00 45,00 53,80aThe size in parentheses/brackets should be avoided, if possible.bP is the pitch of the thread.cMinimum thread height.dMinimum wrenching height.2 ISO 2012 All rights reservedBS ISO 7041:2012ISO 7041:2012(E)4 Requirements and reference Int
24、ernational StandardsSee Table 2.Table 2 Requirements and reference International StandardsMaterialNut body SteelInsert For example polyamideGeneral requirements International Standard ISO 8992ThreadTolerance class 6HInternational Standards ISO 261, ISO 724, ISO 965-2Mechanical and performance proper
25、tiesProperty class 9, 12International Standards ISO 898-2, ISO 2320ToleranceProduct gradeFor D M16: AFor D M16: BInternational Standard ISO 4759-1Finish CoatingAs processed.Requirements for electroplating are specified in ISO 4042.Requirements for non-electrolytically applied zinc flake coatings are
26、 specified in ISO 10683.Additional requirements or other finishes or coatings shall be agreed between the supplier and the purchaser.Surface integrityLimits for surface discontinuities are specified in ISO 6157-2.Acceptability Acceptance inspection is specified in ISO 3269.5 DesignationEXAMPLE A pre
27、vailing torque type hexagon nut, style 2, with non-metallic insert, thread M12 and property class 12, is designated as follows:Prevailing torque type hexagon nut ISO 7041 - M12 - 12 ISO 2012 All rights reserved 3BS ISO 7041:2012ISO 7041:2012(E)Bibliography1 ISO 4033, Hexagon nuts, style 2 Product gr
28、ades A and B4 ISO 2012 All rights reservedBS ISO 7041:2012BS ISO 7041:2012ISO 7041:2012(E) ISO 2012 All rights reservedICS 21.060.20Price based on 4 pagesThis page deliberately left blankBSI is the independent national body responsible for preparing British Standards and other standards-related publ
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