1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 4161:2012Hexagon nuts with flange,style 2 Coarse threadBS ISO 4161:2012 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 4161:2012.It
2、 supersedes BS ISO 4161:1999, which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee FME/9/1, Fasteners - Mechanical properties.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport
3、 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 2012ISBN 978 0 580 78297 8 ICS 21.060.20 Compliance with a British Standard cannot confer immunity from legal obligati
4、ons.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 September 2012.Amendments issued since publicationDate T e x t a f f e c t e dBS ISO 4161:2012 ISO 2012Hexagon nuts with flange, style 2 Coarse threadcrous hexagonaux embase cylindro-tron
5、conique, style 2 Filetage pas grosINTERNATIONAL STANDARDISO4161Third edition2012-09-01Reference numberISO 4161:2012(E)BS ISO 4161:2012ISO 4161:2012(E)ii ISO 2012 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2012All rights reserved. Unless otherwise specified, no part of this publication may b
6、e 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 in the country of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41
7、22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 4161:2012ISO 4161:2012(E) ISO 2012 All rights reserved iiiContents PageForeword iv1 Scope 12 Normative references . 13 Dimensions . 14 Requirements and reference International Standards 45 Designati
8、on . 4Annex A (informative) Gauging of hexagon nuts with flange . 5Bibliography . 7BS ISO 4161:2012ISO 4161:2012(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standard
9、s 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
10、part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.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
11、prepare International Standards. 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.Attention is drawn to the possibility tha
12、t 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 4161 was prepared by Technical Committee ISO/TC 2, Fasteners, Subcommittee SC 12, Fasteners with internal metric thread.This third edition
13、cancels and replaces the second edition (ISO 4161:1999), of which it constitutes a minor revision.iv ISO 2012 All rights reservedBS ISO 4161:2012INTERNATIONAL STANDARD ISO 4161:2012(E)Hexagon nuts with flange, style 2 Coarse thread1 ScopeThis International Standard specifies the characteristics of h
14、exagon nuts with flange (style 2), with metric coarse threads from M5 to M20 inclusive, of product grade A for threads up to and including M16 and product grade B for threads above M16.If, in special cases, specifications other than those listed in this International Standard are required, they can
15、be selected from existing International Standards, for example ISO 261, ISO 724, ISO 898-2, ISO 965-2 and ISO 3506-2.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated refe
16、rences, the latest edition of the referenced document (including 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 898-2, Mechanical properties of fasteners made of carbon s
17、teel 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 3269, Fasteners Acceptance inspectionI
18、SO 3506-2, Mechanical properties of corrosion-resistant stainless steel fasteners Part 2: NutsISO 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 89
19、92, Fasteners General requirements for bolts, screws, studs and nutsISO 10683, Fasteners Non-electrolytically applied zinc flake coatings3 DimensionsSee Figure 1 and Table 1.Symbols and descriptions of dimensions are specified in ISO 225. ISO 2012 All rights reserved 1BS ISO 4161:2012ISO 4161:2012(E
20、)amwis the wrenching height; see note to Table 1.b = 90 to 120.c = 15 to 30.d = 15 to 25.ec is measured at dw,min.fContour of the edge is at the discretion of the manufacturer.Figure 12 ISO 2012 All rights reservedBS ISO 4161:2012ISO 4161:2012(E)Table 1 DimensionsDimensions in millimetresThread DM5
21、M6 M8 M10 M12 (M14)aM16 M20Pb0,8 1 1,25 1,5 1,75 2 2 2,5c min. 1,0 1,1 1,2 1,5 1,8 2,1 2,4 3,0damax. 5,75 6,75 8,75 10,80 13,00 15,10 17,30 21,60min. 5,00 6,00 8,00 10,00 12,00 14,00 16,00 20,00dcmax. 11,8 14,2 17,9 21,8 26,0 29,9 34,5 42,8dwmin. 9,8 12,2 15,8 19,6 23,8 27,6 31,9 39,9e min. 8,79 11,
22、05 14,38 16,64 20,03 23,36 26,75 32,95mmax. 5,00 6,00 8,00 10,00 12,00 14,00 16,00 20,00min. 4,70 5,70 7,64 9,64 11,57 13,30 15,30 18,70mwmin. 2,5 3,1 4,6 5,6 6,8 7,7 8,9 10,7smax. 8,00 10,00 13,00 15,00 18,00 21,00 24,00 30,00min. 7,78 9,78 12,73 14,73 17,73 20,67 23,67 29,16rcmax. 0,3 0,4 0,5 0,6
23、0,7 0,9 1,0 1,2NOTE If the product passes the gauging given in Annex A, the requirements for dimensions e, c and mware satisfied.aThe size in parentheses should be avoided if possible.bP is the pitch of the thread.cRadius, r, applies both at the corners and the flats of the hexagon. ISO 2012 All rig
24、hts reserved 3BS ISO 4161:2012ISO 4161:2012(E)4 Requirements and reference International StandardsSee Table 2.Table 2 Requirements and reference International StandardsMaterial SteelStainless steelGeneral requirements International Standard ISO 8992ThreadTolerance class 6HInternational StandardsISO
25、261, ISO 965-2Mechanical propertiesProperty class 8, 9, 10, 12 A2-70International StandardsISO 898-2 ISO 3506-2ToleranceProduct gradeD M16: AD M16: BInternational Standard ISO 4759-1Finish CoatingAs processed As processedRequirements for electroplating are specified in ISO 4042.Requirements for non-
26、electrolytically applied zinc flake coatings are specified in ISO 10683.Requirements for hot dip galvanization are specified in ISO 10684.Additional requirements or other finishes or coatings shall be agreed between the supplier and the purchaser.Surface integrityLimits for surface discontinuities a
27、re specified in ISO 6157-2.Acceptability Acceptance inspection is specified in ISO 3269.5 DesignationEXAMPLE A hexagon nut with flange, with thread M12 and of property class 10 is designated as follows:Hexagon nut with flange ISO 4161 - M12 - 104 ISO 2012 All rights reservedBS ISO 4161:2012ISO 4161:
28、2012(E)Annex A (informative) Gauging of hexagon nuts with flangeA.1 Recommended method for gauging of hexagonSee Figure A.1 and Table A.1.The nut shall be gauged using two plain ring gauges, A and B, to demonstrate the coincidental acceptability of hexagon height, wrenching height, corner fill and w
29、idth across corners. Gauge A shall be placed over the nut and shall be seated on the flange. Gauge B shall be placed on the top of the nut normal to the nut axis. The two gauges shall not be in contact.A.2 Recommended method for gauging of flange thicknessSee Figure A.1 and Table A.1.Gauge C is a fl
30、at feeler or ring gauge. It is used to prove that the flange thickness at the junction of the gauge with the hexagon portion is equal to or greater than specified values. The acceptance criterion is that gauge C fits under gauge A without contact where the nut is seated on a flat plate.Key1 gauge A2
31、 gauge B3 gauge CNOTE Wa,min= etheoreticalWb,max= emin 0,01 mmTa,max= mw,minFigure A.1 ISO 2012 All rights reserved 5BS ISO 4161:2012ISO 4161:2012(E)Table A.1Dimensions in millimetresThread Gauge A Gauge B Gauge CD WaTaWbTbWcTcmax. min. max. min. max. min. min. min. max. min.M5 9,25 9,24 2,50 2,49 8
32、,78 8,77 3 14 1,08 1,07M6 11,56 11,55 3,10 3,09 11,04 11,03 4 16 1,19 1,18M8 15,02 15,01 4,60 4,59 14,37 14,36 4 20 1,31 1,30M10 17,33 17,32 5,60 5,59 16,63 16,62 5 24 1,81 1,80M12 20,79 20,78 6,80 6,79 20,02 20,01 5 29 2,20 2,19M14 24,26 24,25 7,70 7,69 23,35 23,34 6 32,5 2,55 2,54M16 27,72 27,71 8
33、,90 8,89 26,74 26,73 6 37 2,96 2,95M20 34,65 34,64 10,70 10,69 32,94 32,93 6 45 3,70 3,696 ISO 2012 All rights reservedBS ISO 4161:2012ISO 4161:2012(E)Bibliography1 ISO 724, ISO general-purpose metric screw threads Basic dimensions ISO 2012 All rights reserved 7BS ISO 4161:2012ISO 4161:2012(E) ISO 2
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