1、DEUTSCHE NORM Februarv 1998 DIN EN 1666 Prevailing torque type hexagon nuts with flange (with non-metallic insert), with metric fine pitch thread (IS0 121 25 : 1997, modified) Enalish version of DIN EN 1666 ICs 21.060.20 This standard, together Descriptors: Fasteners, hexagon nuts, properties. Sechs
2、kantmuttern mit Klemmteil und Flansch (mit nichtmetallischem Einsatz) mit metrischem Feingewinde (IS0 12125 : 1997, modified) with DIN EN 1663, February 1998 edition, supersedes DIN 6926, November 1983 edition. European Standard EN 1666 : 1997 has the status of a DIN Standard. A comma is used as the
3、 decimal marker. National foreword This standard has been prepared by CEN/TC 185. The responsible German body involved in its preparation was the Normenausschu Mechanische Verbindungselemenfe (Fasteners Standards Committee). It should be noted that, as a departure from IS0 121 25, the width across f
4、lats for thread size M1 O specified in this European Standard is 16 mm instead of 15 mm. The DIN Standards corresponding to the EuropeanAnternational Standards referred to in clause 2 of the EN are as follows: EN IS0 2320 IS0 3269 DIN IS0 3269 IS0 8992 DIN IS0 8992 The DIN 4000-2-7 tabular layout of
5、 article characteristics shall apply to the nuts covered in this standard. DIN EN IS0 2320 Amendments DIN 6926, November 1983 edition, has been superseded by the specifications of DIN EN 1663 and EN 1666. Previous edition DIN 6926: 1983-1 1. National Annex NA Standards referred to (and not included
6、in Normative references) DIN 4000-2 Tabular layouts of article characteristics for bolts, screws and nuts DIN EN IS0 2320 Prevailing torque type steel hexagon nuts - Mechanical and performance properties (IS0 2320 : 1997) EN comprises 7 pages. No pari of this standard may be reproduced without the p
7、rior permission of Ref. No. DIN EN 1666: 1998-0 V Deutsches Institut fr Nonung e. V., Berlin. Luth Verlag GmbH, D-10772 Berlin, has the exclusive right of sale for German Standards (DIN-Normen). . English price group 07 Sales No . . 1107 07.98 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 166
8、6 December 1997 ICs 21.060.20 Descriptors: Fasteners, hexagon nuts, properties. English version Prevailing torque type hexagon nuts with flange (with non-metallic insert), with metric fine pitch thread (IS0 121 25 : 1997, modified) Ecrous hexagonaux embase, autofreins (avec anneau non mtalli- que) f
9、iletage mtrique pas fin (IS0 12125 : 1997, modifie) Sechskantmuttern mit Klemmteil und Flansch (mit nichtmetallischem Einsatz) mit metrischem Feingewinde (IS0 121 25 : 1997, modifiziert) This European Standard was approved by CEN on 1997-1 0-24. CEN members are bound to comply with the CENKENELEC In
10、ternal 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 stand- ards may be obtained on application to the Central Secretariat or to any CEN m
11、ember. The European Standards exist 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 the Central Secretariat has the same status as the official versions. CEN membe
12、rs are the national standards bodies of Austria, Belgium, the Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, the Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, and the United Kingdom. CEN European Committee for Standardization Comit Europe
13、n de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, 8-1050 Brussels O 1997. CEN - All rights of exploitation in any form and by any means reserved worldwide for CEN national members. Ref. No. EN 1666 : 1997 E Page 2 EN 1666 : 1997 Foreword This European Standar
14、d 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, either by publication of an identical text or by endorsement, at t
15、he latest by June 1998, and conflicting national standards shall be withdrawn at the latest by June 1998. According to the CENKENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic,
16、 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 IS0 121 25: 1997 was approved by CEN as a European Standard with agreed common
17、modifications given as below. The dimensions of nuts correspond to those given in EN 1661 plus prevailing torque feature. Nuts according to this European Standard corresponds to those specified in the International Standard IS0 12125 with the exception that the width across flats for M10 is 16 rnrn
18、(instead of 15 rnrnl. Page 3 EN 1666 : 1997 1 Scope This European Standard specifies the characteristics of prevailing torque type hexagon nuts with flange, with non-metallic annular insert and metric fine pitch thread with nominal thread diameters d from 8 mm up to and including 20 mm, in product g
19、rade A for d 5 16 mm and product grade B for d 16 mm and with property classes 6, 8 and 10. 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 and the
20、 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. EN 493
21、 Fasteners - Surface discontinuities - Nuts prEN IS0 2320 Prevailing torque type steel hexagon nuts - Mechanical and performance properties (ISO/DIS 2320 : 1994) prEN IS0 4042 Fasteners - Electroplated coatings ISO/DIS 4042 : 1996) prEN IS0 4759-1 Tolerances for fasteners - Part 1: Bolts, screws, st
22、uds and nuts - Product grades A, B and C (ISOIDIS 4759-1 : 1997) IS0 724 IS0 general purpose metric screw threads - Basic dimensions IS0 965-2 IS0 general purpose metric screw threads - Tolerances - Part 2: Limits of sizes for general purpose bolt and nut threads - Medium quality IS0 3269 Fasteners
23、- Acceptance inspection IS0 8992 Fasteners - General requirements for bolts, screws, studs and nuts Page 4 EN 1666: 1997 3 Dimensions Dimensions shall be in accordance with figure 1 and table 1. NOTE 1 : Symbols and designations of dimensions are specified in EN 20225. X 1 ) Prevailing torque elemen
24、t, shape optional. 2) m, is the wrenching height; see note to table 1. 4) 6 = 15 to25 5) c is measured at d,. 6) Edge contour optional. 3) e = 90- to 1200 Figure 1 Page 5 EN 1666 : 1997 4 max. 44 min. Table 1 17,9 21,8 15.8 19,6 Thread, d x P21 26 23.8 MlOxl MlOx 1.25 M8x1 I 29,9 34,5 42.8 27,6 31,9
25、 39.9 C min. 1.2 1,5 20,03 16,l min. 4 23,36 26,75 32,95 18,2 20,3 24,8 15.4 11,6 e min. 16.9 19,o 22,7 13,3 15,3 18,7 * min. max. h 6,8 18,OO m3 min. 7,7 8,9 10,7 21 ,o0 24,OO 30,OO 14,38 17,77 r4 max. ; ;i 1 4,6 5,9 max. 13,OO 16,OO 12,73 15,73 0.48 0.6 Dimensions in millimetres M12x15 M12x 1,25 I
26、M14x1.5) M16x1.5 M20x1.5 I I 12 14,O 16.0 20,o 13 15.1 17,3 21.6 17,73 I 20,67 I 23,67 I 29,16 0.72 1 0.88 I 0.96 I 1,2 ) The size in brackets should be avoided if possible. 1 P is the pitch of the thread. 3, Minimum thread height. 41 Radius r applies both at the corners and the flats of the hexagon
27、. NOTE: If the product passes the gauging given in Annex A, the requirements for dimensions e, c and m, are satisfied. Page 6 EN 1666 : 1997 Nut body Insert Material General requirements International Standard 4 Requirements and reference European or International Standards Steel For example, polyam
28、id IS0 8992 The requirements given in table 2 apply. Tolerance International Standards If, in special cases, specifications other than those listed in this European Standard are required, they shall be selected, from existing European or International Standards, for example IS0 724, IS0 965-2, prEN
29、IS0 2320, prEN IS0 4759-1. 6H IS0 724, IS0 965-2 Table 2 Property class 6 8 10 Thread European Standard prEN IS0 2320 European Standard Mechanical and Style decisive for d4 16mm d 16mm performance properties mechanical properties) I style 1 I style 2 style 1 1 style 2 prEN IS0 4759-1 As processed Re
30、quirements for electroplated coatings are covered in prEN IS0 4042. Tolerances Product grade Ford 5 16 mm: A Ford 16 mm: B Finish If different electroplating requirements are desired or if requirements are needed for other finishes, they should be negotiated between customer and supplier. Limits for
31、 surface discontinuities are covered in EN 493. Acceptability I For acceptance inspection IS0 3269 applied. _ i Based on the thread height (dimension mmin) nuts to this standarad are of style 2. However, since for style 2 prEN IS0 2320 does not specify mechanical properties for all property classes
32、and sizes as specified in this standard, in some cases nuts have to be tested according to style 1. 5 Designation EXAMPLE: Designation of a prevailing torque type hexagon nut with flange, with non-metallic insert, thread M12 x 1.5 and property class 8: Hexagon nut EN 1666 - M12x1.5 - 8 Page 7 EN 166
33、6 : 1997 Gauge B Annex A (normative) Gauge C Gauging of hexagon nuts with flange Nominal thread diameter d 8 12 14 20 10 16 A.l Recommended method for gauging of hexagon (see figure A.l and table A.l) Gauge A W, Ta max. min. max. min. 15.02 15.01 4.60 4,59 20.79 20,78 6,80 6.79 24,26 24,25 7.70 7.69
34、 34.65 34,64 10,70 10,69 18.49 i8,48 5.90 5.89 27.72 27,7i 8,go 8.89 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 width across corners. Gauge A shall be placed over the hexagon and sha
35、ll 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. W, A.2 Recommended method for gauging of flange (see figure A. 1 and table A. 1) Th I w, I T, Gauge C is a flat feeler or ring gauge. It is used to prove that the
36、 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 will fit under gauge A without contact when the nut is seated on a flat plate. max. min. 14,37 14.36 17.76 17.75 20,02 20,Ol 23.35 23.34 26,74 26,73 32,94 32,93 1 Gauge A 2 Gauge 0 3 Gauge C min. min. max. min. 4 20 1.31 1.30 5 24 1.65 1,64 5 29 2,20 2.19 6 32,5 2.55 2.54 6 37 2,96 2,95 6 45 3,70 3,69 Figure A.1 Table A.l Dimensions in millimetres
