1、raising standards worldwide NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BSI Standards Publication BS ISO 7041:2012 Prevailing torque type hexagon nuts (with non-metallic insert), style 2 Property classes 9 and 12BS ISO 7041:2012 BRITISH STANDARD National foreword This Brit
2、ish Standard is the UK implementation of ISO 7041:2012. It supersedes BS ISO 7041:2002 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee FME/9/3, Fasteners - Product Standards. A list of organizations represented on this committee can be obtained on req
3、uest to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2012. Published by BSI Standards Limited 2012 ISBN 978 0 580 77982 4 ICS 21.060.20 Compliance with a Br
4、itish Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 June 2012. Amendments issued since publication Date T e x t a f f e c t e dBS ISO 7041:2012 ISO 2012 Prevailing torque type hexag
5、on nuts (with non-metallic insert), style 2 Property classes 9 and 12 crous hexagonaux autofreins ( anneau non mtallique), style 2 Classes de qualit 9 et 12 INTERNATIONAL STANDARD ISO 7041 Fourth edition 2012-05-15 Reference number ISO 7041:2012(E)BS ISO 7041:2012ISO 7041:2012(E) ii ISO 2012 All rig
6、hts reserved COPYRIGHT PROTECTED DOCUMENT ISO 2012 All 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
7、the address below or ISOs member body in the country of the requester. 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 7041:2012ISO 7041:2012(E) Foreword ISO (the International
8、Organization for Standardization) is a worldwide 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 esta
9、blished has the right to be represented on 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 standardiza
10、tion. International Standards are drafted in accordance 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 votin
11、g. Publication as an International Standard requires 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
12、patent rights. ISO 7041 was prepared by Technical Committee 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 704
13、1:2012BS ISO 7041:2012Prevailing torque type hexagon nuts (with non-metallic insert), style 2 Property classes 9 and 12 1 Scope This International Standard specifies the characteristics of prevailing torque type hexagon nuts (with non- metallic insert), style 2, with threads from M5 up to and includ
14、ing M36, in product grade A for threads up to and including 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 sele
15、cted from existing International Standards, e.g. ISO 261, ISO 724, ISO 898-2, ISO 965-2, ISO 2320 and ISO 4759-1. 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 refere
16、nces, the latest edition of the referenced document (including any amendments) applies. ISO 225, Fasteners Bolts, screws, studs and nuts Symbols and descriptions of dimensions ISO 261, ISO general purpose metric screw threads General plan ISO 724, ISO general-purpose metric screw threads Basic dimen
17、sions ISO 898-2, Mechanical properties of fasteners made of carbon steel and alloy steel Part 2: Nuts with specified property classes Coarse thread and fine pitch thread ISO 965-2, ISO general purpose metric screw threads Tolerances Part 2: Limits of sizes for general purpose external and internal s
18、crew threads Medium quality ISO 2320, Prevailing torque type steel nuts Mechanical and performance properties ISO 3269, Fasteners Acceptance inspection ISO 4042, Fasteners Electroplated coatings ISO 4759-1, Tolerances for fasteners Part 1: Bolts, screws, studs and nuts Product grades A, B and C ISO
19、6157-2, Fasteners Surface discontinuities Part 2: Nuts ISO 8992, Fasteners General requirements for bolts, screws, studs and nuts ISO 10683, Fasteners Non-electrolytically applied zinc flake coatings INTERNATIONAL STANDARD ISO 7041:2012(E) ISO 2012 All rights reserved 1BS ISO 7041:2012ISO 7041:2012(
20、E) 3 Dimensions See Figure 1 and Table 1. Symbols and descriptions of dimensions 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 1 Table 1 Dimensions Dimensions in millimetres Thread D M5 M6 M8 M10 M12 (M14
21、) a M16 M20 M24 M30 M36 P b 0,8 1 1,25 1,5 1,75 2 2 2,5 3 3,5 4 d a max. 5,75 6,75 8,75 10,80 13,00 15,10 17,30 21,60 25,90 32,40 38,90 min. 5,00 6,00 8,00 10,00 12,00 14,00 16,00 20,00 24,00 30,00 36,00 d w min. 6,88 8,88 11,63 14,63 16,63 19,64 22,49 27,70 33,25 42,75 51,11 e min. 8,79 11,05 14,38
22、 17,77 20,03 23,36 26,75 32,95 39,55 50,85 60,79 h max. 7,20 8,50 10,20 12,80 16,10 18,30 20,70 25,10 29,50 35,60 42,60 min. 6,62 7,92 9,50 12,10 15,40 17,00 19,40 23,00 27,40 33,10 40,10 m c min. 4,80 5,40 7,14 8,94 11,57 13,40 15,70 19,00 22,60 27,30 33,10 m w d min. 3,84 4,32 5,71 7,15 9,26 10,70
23、 12,60 15,20 18,10 21,80 26,50 s max. 8,00 10,00 13,00 16,00 18,00 21,00 24,00 30,00 36,00 46,00 55,00 min. 7,78 9,78 12,73 15,73 17,73 20,67 23,67 29,16 35,00 45,00 53,80 aThe size in parentheses/brackets should be avoided, if possible. bP is the pitch of the thread. cMinimum thread height. dMinimu
24、m wrenching height. 2 ISO 2012 All rights reservedBS ISO 7041:2012ISO 7041:2012(E) 4 Requirements and reference International Standards See Table 2. Table 2 Requirements and reference International Standards Material Nut body Steel Insert For example polyamide General requirements International Stan
25、dard ISO 8992 Thread Tolerance class 6H International Standards ISO 261, ISO 724, ISO 965-2 Mechanical and performance properties Property class 9, 12 International Standards ISO 898-2, ISO 2320 Tolerance Product grade For D M16: A For D M16: B International Standard ISO 4759-1 Finish Coating As pro
26、cessed. Requirements for electroplating are specified in ISO 4042. Requirements for non-electrolytically applied zinc flake coatings are specified in ISO 10683. Additional requirements or other finishes or coatings shall be agreed between the supplier and the purchaser. Surface integrity Limits for
27、surface discontinuities are specified in ISO 6157-2. Acceptability Acceptance inspection is specified in ISO 3269. 5 Designation EXAMPLE A prevailing torque type hexagon nut, style 2, with non-metallic insert, thread M12 and property class 12, is designated as follows: Prevailing torque type hexagon
28、 nut ISO 7041 - M12 - 12 ISO 2012 All rights reserved 3BS ISO 7041:2012ISO 7041:2012(E) Bibliography 1 ISO 4033, Hexagon nuts, style 2 Product grades A and B 4 ISO 2012 All rights reservedBS ISO 7041:2012BS ISO 7041:2012 ISO 7041:2012(E) ISO 2012 All rights reserved ICS 21.060.20 Price based on 4 pa
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