1、 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 1661:1998 The Europ
2、ean Standard EN 1661:1997 has the status of a British Standard ICS 21.060.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Hexagon nuts with flange (ISO/DIS 4161:1996, modified)This British Standard, having been prepared under the direction of the Engineering Sector Board, w
3、as published under the authority of the Standards Board and comes into effect on 15 April 1998 BSI 1998 ISBN 0 580 29330 0 BS EN 1661:1998 Amendments issued since publication Amd. No. Date Text affected National foreword This British Standard is the English language version of EN 1661:1997. The UK p
4、articipation in its preparation was entrusted by Technical Committee FME/9, Bolts, nuts and accessories, to Subcommittee FME/9/6, General purpose fasteners and accessories, which has the responsibility to: aid enquirers to understand the text; present to the responsible European committee any enquir
5、ies 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 Br
6、itish 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 Brit
7、ish Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. WARNING The United Kingdom, as a member of CEN, is obliged to publish EN 1661:1997 as a British Standard. However, attention is drawn to the
8、fact that during the development of this European Standard the United Kingdom has consistently voted against its approval as a European Standard. The UK believes that the corresponding ISO Standard, ISO/DIS 4161:1996 should have been implemented as the European Standard. As far as the UK is concerne
9、d, it is dangerous and not acceptable to have a separate European Standard that differs from the corresponding ISO Standard by the across flats dimension for one size of fastener, all other requirements being identical between the two standards concerned. As part of BSIs duty of care, we draw attent
10、ion to users of this standard to our concerns that M10 nuts to this standard differ from similar fasteners conforming to ISO/DIS 4161:1996 in the across flats dimension only. This is 16 mm in the European Standard and 15 mm in the ISO. BSI will assume no liability whatsoever for the failure on the p
11、art of any user of this standard not to consider this aspect. Precautions are urged to ensure that comingling of M10 nuts to the two standards concerned is avoided. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises
12、a front cover, an inside front cover, the EN title page, pages 2 to 6, an inside back cover and a back cover.CEN European Committee for Standardization Comite Europe en de Normalisation Europa isches Komitee fu r Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1997 CEN All rights of
13、 exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1661:1997 E EUROPEAN STANDARD EN 1661 NORME EUROPE ENNE EUROPA ISCHE NORM December 1997 ICS 21.060.20 Descriptors: Fasteners, nuts: fasteners, hexagonal units, flanged nuts, dimensions, dimensional to
14、lerances, characteristics, verification, designation English version Hexagon nuts with flange (ISO/DIS 4161:1996, modified) Ecrous hexagonaux a embase cylindro-tronconique (ISO/DIS 4161:1996, modifie e) Sechskantmuttern mit Flansch (ISO/DIS 4161:1996, modifiziert) This European Standard was approved
15、 by CEN on 1997-10-24. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standar
16、ds may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official 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 th
17、e Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United
18、Kingdom.Page 2 EN 1661:1997 BSI 1998 Foreword This European Standard has been prepared by Technical Committee CEN/TC 185, Threaded and non-threaded mechanical fasteners and accessories, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard,
19、either by publication of an identical text or by endorsement, at the latest by June 1998, and conflicting national standards shall be withdrawn at the latest by June 1998. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to
20、implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of the International Standard ISO/DIS 4161
21、1996 was approved by CEN as a European Standard with agreed common modifications as given below. Nuts according to this European Standard correspond to those specified in the Draft International Standard ISO/DIS 4161:1996 with the exception that the width across flats for M10 is 16 mm (instead of 1
22、5 mm) and that the property class 9 was deleted.Page 3 EN 1661:1997 BSI 1998 Table 1 Dimensions in millimetres Thread (d) M5 M6 M8 M10 M12 (M14) 1) M16 M 20 P 2) 0,8 1 1,25 1,5 1,75 2 2 2,5 c min. 1 1,1 1,2 1,5 1,8 2,1 2,4 3 d a min. 5,00 6,00 8,00 10,0 12 14,0 16,0 20,0 max. 5,75 6,75 8,75 10,8 13
23、15,1 17,3 21,6 d c max. 11,8 14,2 17,9 21,8 26,0 29,9 34,5 42,8 d w min. 9,8 12,2 15,8 19,6 23,8 27,6 31,9 39,9 e min. 8,79 11,05 14,38 17,77 20,03 23,36 26,75 32,95 m max. 5,0 6,0 8,00 10,00 12,00 14,0 16,0 20,0 min. 4,7 5,7 7,64 9,64 11,57 13,3 15,3 18,7 m w min. 2,5 3,1 4,6 5,9 6,8 7,7 8,9 10,7 s
24、 max. 8,00 10,00 13,00 16,00 18,00 21,00 24,00 30,00 min. 7,78 9,78 12,73 15,73 17,73 20,67 23,67 29,16 r 3) max. 0,3 0,36 0,48 0,6 0,72 0,88 0,96 1,2 1) The size in brackets should be avoided if possible. 2) P is the pitch of the thread. 3) Radius r applies both at the corners and the flats of the
25、hexagon. NOTE If the product passes the gauging given in annex A, the requirements for dimensions e, c and m w are satisfied. 1 Scope This European Standard specifies the characteristics of hexagon nuts with flange, with threads from M5 to M20 inclusive, of product grade A for threads up to and incl
26、uding M16 and product grade B for threads above M16 and with property classes 8, 10, 12 and A2-70. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text
27、and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies.
28、 EN 493, Fasteners Surface discontinuities Nuts EN 20898-2, Mechanical properties of fasteners Part 2: Nuts with specified proof load values Coarse thread (ISO 898-2:1992) prEN ISO 4042, Fasteners Electroplated coatings (ISO/DIS 4042:1996) prEN ISO 4759-1, Tolerances for fasteners Part 1: Bolts, scr
29、ews, studs and nuts Product grades A, B and C (ISO/DIS 4759-1:1997) ISO 724, ISO general purpose metric screw threads Basic dimensions ISO 965-2, ISO general purpose metric screw threads Tolerances Part 2: Limits of sizes for general purpose bolt and nut threads Medium quality ISO 3269, Fasteners Ac
30、ceptance inspection prEN ISO 3506-2, Mechanical properties of corrosion-resistant stainless steel fasteners Part 2: Nuts (ISO/DIS 3506-2:1995) ISO 8992, Fasteners General requirements for bolts, screws, studs and nuts 3 Dimensions Dimensions shall be in accordance with Figure 1 and Table 1. NOTE Sym
31、bols and designations of dimensions are specified in EN 20225.Page 4 EN 1661:1997 BSI 1998 1) m w is the wrenching height; see note to Table 1. 2) u = 90 to 120 3) b = 15 to 30 4) d = 15 to 25 5) c is measured at d wm i n . 6) Edge contour optimal. Figure 1Page 5 EN 1661:1997 BSI 1998 Table 2 Materi
32、al Steel Stainless steel General requirements International Standard ISO 8992 Thread Tolerance 6H International Standards ISO 724, ISO 965-2 Mechanical Property class 8 10 12 A2-70 properties Style decisive for mechanical properties 1) d# M16 style 1 d M16 style 2 style 1 style 2 European Standards
33、EN 20898-2 prEN ISO 3506-2 Tolerances Product grade d# M16: A d M16: B European Standard prEN ISO 4759-1 Finish As processed Plain Requirements for electroplating are covered in prEN ISO 4042. If different electroplating requirements are desired or if requirements are needed for other finishes, they
34、 should be negotiated between supplier and customer. Limits for surface discontinuties are covered in EN 493. Acceptability For acceptance inspection ISO 3269 applies. 1) Based on the nut height (dimension m min ) nuts to this standard are of style 2. However, since for style 2 EN 20898-2 does not s
35、pecify mechanical properties for all property classes and sizes as specified in this standard, in some cases nuts have to be tested according to style 1. 4 Requirements and reference European or International Standards The requirements given in Table 2 apply. If, in special cases, specifications oth
36、er than those listed in this European Standard are required, they shall be selected from existing European or International Standards, for example ISO 724, EN 20898-2, ISO 965-2, prEN ISO 3506-2. 5 Designation EXAMPLE: Designation of a hexagon nut with flange, with thread M12 and property class 10:
37、Hexagon nut EN 1661 M12 10Page 6 EN 1661:1997 BSI 1998 1 Gauge A 2 Gauge B 3 Gauge C NOTE W a, min = e theoretical W b, max = e min 2 0,01 mm T a, max = m w, min Figure A.1 Table A.1 Dimensions in millimetres Thread Gauge A Gauge B Gauge C W a T a W b T b W c T c max. min. max. min. max. min. min. m
38、in. max. min. M5 9,25 9,24 2,50 2,49 8,78 8,77 3 14 1,08 1,07 M6 11,56 11,55 3,10 3,09 11,04 11,03 4 16 1,19 1,18 M8 15,02 15,01 4,60 4,59 14,37 14,36 4 20 1,31 1,30 M10 18,49 18,48 5,90 5,89 17,76 17,75 5 24 1,65 1,64 M12 20,79 20,78 6,80 6,79 20,02 20,01 5 29 2,20 2,19 M14 24,26 24,25 7,70 7,69 23
39、35 23,34 6 32,5 2,55 2,54 M16 27,72 27,71 8,90 8,89 26,74 26,73 6 37 2,96 2,95 M20 34,65 34,64 10,70 10,69 32,94 32,93 6 45 3,70 3,69 Annex A (normative) Gauging of hexagon flange nuts A.1 Recommended method for gauging of hexagon (see Figure A.1 and Table A.1) The nut shall be gauged using two pla
40、in ring gauges, A and B, to demonstrate the coincidental acceptability of hexagon height, corner fill and width across corners. Gauge A shall be placed over the hexagon 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 b
41、e in contact. A.2 Recommended method for gauging of flange (see Figure A.1 and Table A.1) Gauge C is a flat 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
42、 is that gauge C will fit under gauge A without contact when the nut is seated on a flat plate.blankBSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
43、 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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 inco
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