1、BSI Standards PublicationBS EN ISO 21670:2014Fasteners - Hexagon weld nuts with flangeBS EN ISO 21670:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 21670:2014. It supersedes BS EN ISO 21670:2003 which is withdrawn.The UK participation in its preparati
2、on was entrusted to Technical Committee FME/9, Fasteners.A list of organizations represented on this committee can be obtained on request 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 B
3、ritish Standards Institution 2014.Published by BSI Standards Limited 2014ISBN 978 0 580 81816 5ICS 21.060.20Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 Ju
4、ne 2014.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 21670 May 2014 ICS 21.060.20 Supersedes EN ISO 21670:2003English Version Fasteners - Hexagon weld nuts with flange (ISO 21670:2014) Fixations - crous hexagonaux
5、souder, embase plate (ISO 21670:2014) Mechanische Verbindungselemente - Sechskant-Schweimuttern mit Flansch (ISO 21670:2014) This European Standard was approved by CEN on 13 April 2014. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for givin
6、g this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three offic
7、ial versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of
8、Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, S
9、weden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for
10、 CEN national Members. Ref. No. EN ISO 21670:2014 EBS EN ISO 21670:2014EN ISO 21670:2014 (E) 3 Foreword This document (EN ISO 21670:2014) has been prepared by Technical Committee ISO/TC 2 “Fasteners” in collaboration with Technical Committee CEN/TC 185 “Fasteners” the secretariat of which is held by
11、 DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by November 2014, and conflicting national standards shall be withdrawn at the latest by November 2014. Attention is drawn to the possibility tha
12、t some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN ISO 21670:2003. According to the CEN-CENELEC Internal Regulations, the national standards organizat
13、ions of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malt
14、a, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 21670:2014 has been approved by CEN as EN ISO 21670:2014 without any modification. BS EN ISO 21670:2014ISO 21670:2014(E) ISO 2014 All r
15、ights reserved iiiContents PageForeword iv1 Scope . 12 Normative references 13 Dimensions . 14 Technical delivery conditions . 34.1 General requirements . 34.2 Material . 34.3 Tolerances . 34.4 Mechanical properties 34.5 Surface finish 34.6 Surface integrity. 44.7 Acceptance inspection 45 Designatio
16、n 46 Marking 47 Connecting dimensions . 4BS EN ISO 21670:2014ISO 21670:2014(E)ForewordISO (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
17、 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 cl
18、osely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria
19、 needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2. www.iso.org/directivesAttention is drawn to the possibility that some of the elements of this document may be the subject of patent ri
20、ghts. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received. www.iso.org/patentsAny trade name used in this doc
21、ument is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trad
22、e (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 2, Fasteners, Subcommittee SC 12, Fasteners with metric internal thread.This second edition cancels and replaces the first edition (ISO 21670:2003), of which it constitutes a mino
23、r revision.iv ISO 2014 All rights reservedBS EN ISO 21670:2014INTERNATIONAL STANDARD ISO 21670:2014(E)Fasteners Hexagon weld nuts with flange1 ScopeThis International Standard specifies characteristics for hexagon weld nuts with flange, with sizes M5 to M16 (coarse thread) or D = 8 mm to 16 mm (fine
24、 pitch thread), of product grade A.Weld nuts conforming to this International Standard are suitable for use with bolts of property classes up to 10.9 according to ISO 898-1.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispe
25、nsable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 724, ISO general-purpose metric screw threads Basic dimensionsISO 898-1, Mechanical properties of fasteners m
26、ade of carbon steel and alloy steel Part 1: Bolts, screws and studs with specified property classes Coarse thread and fine pitch threadISO 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 threadIS
27、O 965-3, ISO general purpose metric screw threads Tolerances Part 3: Deviations for constructional screw threadsISO 3269, Fasteners Acceptance inspectionISO 4759-1, Tolerances for fasteners Part 1: Bolts, screws, studs and nuts Product grades A, B and CISO 6157-2, Fasteners Surface discontinuities P
28、art 2: NutsISO 8992, Fasteners General requirements for bolts, screws, studs and nuts3 DimensionsNut dimensions shall be as given in Figure 1 and Table 1. ISO 2014 All rights reserved 1BS EN ISO 21670:2014ISO 21670:2014(E)Dimensions in millimetresKeyaPressing contour.bPressing contour, at least 15.F
29、igure 1 Nut dimensionsTable 1 Nut dimensionsDimensions in millimetresThread size Approx. massD D P1aP2bb c dadce f g m s r1r2( = 7,85 kg/dm3)per 1 000 pieceskg020,0,1 max. 10min. 0,25 0,1 min. max. h14 0,1 0,1M5 0,8 2,20 0,8 6 15,5 8,2 1,7 4,0 4,70 5,00 8 0,6 0,3 2,9M6 1 2,70 0,8 7 18,5 10,6 2,0 5,0
30、 6,64 7,00 10 0,6 0,5 5,7M8 M8 1 1,25 2,70 1,0 9,5 22,5 13,6 2,5 6,0 9,64 10,00 13 0,8 0,8 12,2M10M10 1,25M10 11,5 2,95 1,2 11,5 26,5 16,9 3,0 7,0 12,57 13 16 1,0 1,0 21,8M12M12 1,5M12 1,251,75 3,20 1,2 14 30,5 19,4 3,0 8,0 14,57 15 18 1,0 1,2 29,4M14 M14 1,5 2 3,45 1,2 16 33,5 22,4 4,0 8,0 16,16 17
31、 21 1,0 1,2 45,8M16 M16 1,5 2 3,70 1,2 18 36,5 25,0 4,0 8,0 18,66 19,50 24 1,0 1,2 63,1aP1is the pitch of the fine pitch thread.bP2is the pitch of the coarse pitch thread.2 ISO 2014 All rights reservedBS EN ISO 21670:2014ISO 21670:2014(E)4 Technical delivery conditions4.1 General requirementsGeneral
32、 requirements are specified in ISO 8992.4.2 MaterialWeld nuts with flange shall be made of steel with a maximum carbon content of 0,25 % having a carbon equivalent content CEV of maximum 0,53 % (mass fraction) determined as follows:CEV=C+Mn6+Cr+Mo+V5+Ni+Cu15If quenching and tempering of the nuts is
33、required, the hardness shall not exceed 300 HV.Use of free-cutting steel is not permissible.If a specific steel is required, this shall be agreed on ordering.4.3 TolerancesWeld nuts with flange shall be of product grade A in accordance with ISO 4759-1, with threads in accordance with ISO 724, howeve
34、r, with tolerance class 6G in accordance with ISO 965-3.4.4 Mechanical propertiesWeld nuts according to this International Standard shall meet the proof load values as specified in Table 2. The proof load test shall be in accordance with ISO 898-2. In case of dispute, welding projections shall be re
35、moved prior to testing.Table 2 Proof load valuesCoarse pitch thread DProof load NFine pitch thread D P1Proof load NM5 14 800 M6 20 900 M8 38 100 M8 1 43 100M10 60 300M10 1,25 M10 167 300 71 000M12 88 500M12 1,5 M12 1,2597 800 102 200M14 120 800 M14 1,5 138 800M16 164 900 M16 1,5 185 4004.5 Surface f
36、inishHexagon weld nuts with flange are delivered uncoated.Since uncoated weld nuts may be affected by corrosion during transport or storage, the manufacturer shall prove corrosion protection that does not impair nut weldability. ISO 2014 All rights reserved 3BS EN ISO 21670:2014ISO 21670:2014(E)4.6
37、Surface integrityLimits for surface discontinuities are specified in ISO 6157-2.4.7 Acceptance inspectionAcceptance inspection shall comply with the specifications given in ISO 3269.5 DesignationEXAMPLE 1 A hexagon weld nut with flange, thread M10, made of steel, not quenched and tempered, which is
38、suitable for use with a corresponding bolt or screw of property class 10.9, is designated as follows:Weld nut ISO 21670 - M10 StIf a quenched and tempered weld nut is agreed, the symbol QT shall be added to the designation.EXAMPLE 2 A hexagon weld nut with flange, thread M12 1,5, made of steel, quen
39、ched and tempered, which is suitable for use with a corresponding bolt or screw of property class 10.9, is designated as follows:Weld nut ISO 21670 - M12 1,5 St QT6 MarkingHexagon weld nuts with flange of size M5 or greater shall be marked with the manufacturers mark. The marking shall be at the nut
40、 face which is opposite to the flange.7 Connecting dimensionsSee Figure 2 and Table 3.Figure 2 Connecting dimensions (nut not welded on)4 ISO 2014 All rights reservedBS EN ISO 21670:2014ISO 21670:2014(E)Table 3 Connecting dimensionsThread size as in Table 1 Plate thicknessaHole diameterdhD D P1min.
41、max. H11M5 0,88 1,2 7,0M6 0,88 1,8 8,0M8 M8 1 1,0 2,0 10,5M10M10 1,25M10 11,25 2,5 12,5M12M12 1,5M12 1,251,5 3,0 14,8M14 M14 1,5 2,0 3,5 16,8M16 M16 1,5 2,0 4,0 18,8 ISO 2014 All rights reserved 5This page deliberately left blankThis page deliberately left blankBSI is the national body responsible f
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