BS-ISO-7041-1997.pdf

BRITISH STANDARD BS ISO 7041:1997 Prevailing torque type hexagon nuts (with non-metallic insert), style 2 Property classes 9 and 12 ICS 21.060.20 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:04:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 7041:1997 This British Standard, having been prepared under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 December 1997 © BSI 05-1999 ISBN 0 580 29447 1 National foreword This British Standard reproduces verbatim ISO 7041:1997 and implements it as the UK national standard. The UK participation in its preparation was entrusted by Technical Committee FME/9, Bolts, nuts and accessories, to Subcommittee FME/9/10, Male and female prevailing torque fasteners, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the ISO title page, page ii, pages 1 to 4 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:04:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 7041:1997 © BSI 05-1999i Contents Page National forewordInside front cover Forewordii 1Scope1 2Normative references 1 3Dimensions2 4Requirements and reference International Standards3 5Designation3 Annex A (informative) Bibliography 4 Figure 12 Table 1 Dimensions2 Table 2 Requirements and reference International Standards3 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:04:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:04:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:04:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 7041:1997 ii © BSI 05-1999 Foreword ISO (the International 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 established 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 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. International Standard ISO 7041 was prepared by Technical Committee ISO/TC2, Fasteners, Subcommittee SC 1, Mechanical properties of fasteners. This second edition cancels and replaces the first edition (ISO 7041:1983), which has been technically revised. Annex A of this International Standard is for information only. Descriptors: Fasteners, nuts (fasteners), self-locking nuts, hexagonal nuts, specifications, dimensions, designation. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:04:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 7041:1997 © BSI 05-19991 1 Scope This International Standard specifies the characteristics of prevailing torque type hexagon nuts (with non-metallic annular insert), style 2, with threads from M5 up to and including 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. NOTEThe dimensions of the nuts, with the exception of the diameter mw, correspond to those given in ISO 4033 plus prevailing torque feature. If other specifications are required, they should be selected from existing International Standards, for example ISO 261, ISO 965-2, ISO 2320 and ISO 4759-1. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 225:1983, Fasteners Bolts, screws, studs and nuts Symbols and designations of dimensions. ISO 261:, ISO general purpose metric screw threads General plan1). ISO 965-2:, ISO general purpose metric screw threads Tolerances Part 2: Limits of sizes for general purpose bolt and nut threads Medium quality2). ISO 2320:1997, Prevailing torque type steel hexagon nuts Mechanical and performance properties. ISO 3269:1988, Fasteners Acceptance inspection. ISO 4042:, Fasteners Electroplated coatings3). ISO 4759-1:, Tolerances for fasteners Part 1: Bolts, screws, studs and nuts Product grades A, B and C4). ISO 6157-2:1995, Fasteners Surface discontinuities Part 2: Nuts. ISO 8992:1986, Fasteners General requirements for bolts, screws, studs and nuts. 1) To be published. (Revision of ISO 261:1973) 2) To be published. (Revision of ISO 965-2:1980) 3) To be published. (Revision of ISO 4042:1989) 4) To be published. (Revision of ISO 4759-1:1978) Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:04:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 7041:1997 2 © BSI 05-1999 3 Dimensions See Figure 1 and Table 1. Symbols and designations of dimensions are specified in ISO 225. Table 1 Dimensions Figure 1 Dimensions in millimetres Thread (d)M5M6M8M10M12 (M14)a M16M20M24M30M36 Pb0,811,251,51,75222,533,54 damax. 5,756,758,7510,81315,117,321,625,932,438,9 min. 5,006,008,0010,01214,016,020,024,030,036,0 dwmin. 6,888,8811,6314,6316,6319,6422,4927,733,2542,7551,11 emin. 8,7911,0514,3817,7720,0323,3626,7532,9539,5550,8560,79 hmax. 7,208,5010,212,816,118,320,725,129,535,642,6 min. 6,627,929,512,115,417,019,423,027,433,140,1 mcmin. 4,85,47,148,9411,5713,415,71922,627,333,1 mwdmin. 3,523,925,156,438,39,6811,2813,5216,1619,4423,52 smax. 8,0010,0013,0016,0018,0021,0024,0030,00364655,0 min. 7,789,7812,7315,7317,7320,6723,6729,16354553,8 a The size in brackets should be avoided if possible. b P is the pitch of the thread. c Minimum thread height. d Minimum wrenching height. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:04:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 7041:1997 © BSI 05-19993 4 Requirements and reference International Standards See Table 2 Table 2 Requirements and reference International Standards 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 nut ISO 7041 M12 12 MaterialNut bodySteel InsertFor example, polyamid General requirements International StandardISO 8992 ThreadTolerance6H International StandardsISO 261, ISO 965-2 Mechanical and performance properties Property class912 Style decisive for mechanical properties style 2style 2 International StandardISO 2320 TolerancesProduct gradeFor d M16: B International StandardISO 4759-1 FinishAs processed Requirements for electroplated coatings are covered in ISO 4042. If different electroplating requirements are desired or if requirements are needed for other finishes, they should be negotiated between customer and supplier. Limits for surface discontinuities are covered in ISO 6157-2. AcceptabilityFor acceptance procedure, see ISO 3269. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:04:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 7041:1997 4 © BSI 05-1999 Annex A (informative) Bibliography 1 ISO 4033:1979, Hexagon nuts, style 2 Product grades A and B. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:04:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 5blank Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:04:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 7041:1997 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel: 020 8996 9000. Fax: 020 8996 7400. BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards. Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services. Tel: 020 8996 9001. Fax: 020 8996 7001. In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested. Information on standards BSI provides a wide range of information on national, European and international standards through its Library and its Technical Help to Exporters Service. Various BSI electronic information services are also available which give details on all its products and services. Contact the Information Centre. Tel: 020 8996 7111. Fax: 020 8996 7048. Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards. For details of these and other benefits contact Membership Administration. Tel: 020 8996 7002. Fax: 020 8996 7001. Copyright Copyright subsists in all BSI publications. BSI also holds the copyright, in the UK, of the publications of the internationalstandardization bodies. Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means electronic, photocopying, recording or otherwise without prior written permission from BSI. This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols, and size, type or grade designations. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. If permission is granted, the terms may include royalty payments or a licensing agreement. Details and advice can be obtained from the Copyright Manager. Tel: 020 8996 7070. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:04:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI