1、Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 18/04/2008 02:45, Uncontrolled Copy, (c) BSIg49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58c
2、ounterbore and captive washer, in heat resisting steel, silver plated Classification: 1 100 MPa (at ambient temperature) / 425 CICS 49.030.30Aerospace series Nuts, hexagonal, self-locking, with BRITISH STANDARDBS EN 3431:2007BS EN 3431:2007Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 18/04
3、/2008 02:45, Uncontrolled Copy, (c) BSIThis British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 January 2008 BSI 2008ISBN 978 0 580 60328 0Amendments/corrigenda issued since publicationDate CommentsCompliance with a British Standard cannot confer i
4、mmunity from legal obligations. National forewordThis British Standard is the UK implementation of EN 3431:2007.The UK participation in its preparation was entrusted to Technical Committee ACE/12, Aerospace fasteners and fastening systems.A list of organizations represented on this committee can be
5、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.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 3431 December 2007 ICS 49.030.30 English Version Aerospace series - Nut
6、s, hexagonal, self-locking, with counterbore and captive washer, in heat resisting steel, silver plated - Classification: 1 100 MPa (at ambient temperature) / 425 C Srie arospatiale - crous hexagonaux, freinage interne, avec chambrage et rondelle captive, en acier rsistant chaud, argents - Classific
7、ation : 1 100 MPa ( temprature ambiante) / 425 C Luft- und Raumfahrt - Sechskantmuttern, selbstsichernd, mit zylindrischer Aussenkung und Brdelscheibe, aus hochwarmfestem Stahl, versilbert - Klasse: 1 100 MPa (bei Raumtemperatur) / 425 C This European Standard was approved by CEN on 5 November 2007.
8、 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 standards may be obtained on
9、application to the CEN Management Centre 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 the CEN Management Cen
10、tre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Pola
11、nd, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2007 CEN All rights of exploitation in any form and by
12、 any means reserved worldwide for CEN national Members. Ref. No. EN 3431:2007: ELicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 18/04/2008 02:45, Uncontrolled Copy, (c) BSI2 Contents Page Foreword3 1 Scope 4 2 Normative references 4 3 Required characteristics.5 4 Designation 7 5 Marking .7 6
13、Technical specification .7 EN 3431:2007Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 18/04/2008 02:45, Uncontrolled Copy, (c) BSI3 Foreword This document (EN 3431:2007) has been prepared by the Aerospace and Defence Industries Association of Europe - Standardization (ASD-STAN). After enquir
14、ies and votes carried out in accordance with the rules of this Association, this Standard has received the approval of the National Associations and the Official Services of the member countries of ASD, prior to its presentation to CEN. This European Standard shall be given the status of a national
15、standard, either by publication of an identical text or by endorsement, at the latest by June 2008, and conflicting national standards shall be withdrawn at the latest by June 2008. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights.
16、CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech
17、Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. EN 3431:2007Licensed Copy: Wang Bin, ISO/EXCHAN
18、GE CHINA STANDARDS, 18/04/2008 02:45, Uncontrolled Copy, (c) BSI4 1 Scope This standard specifies the characteristics of self-locking hexagonal nuts, with counterbore and captive washer, in heat resisting steel, silver plated. Classification: 1 100 MPa 1)/ 425 C 2). 2 Normative references The follow
19、ing referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 5855-2, Aerospace MJ threads Part 2: Limit dimensions f
20、or bolts and nuts. ISO 5858, Aerospace Nuts, self-locking, with maximum operating temperature less than or equal to 425 C Procurement specification. ISO 8538, Aerospace Nuts, hexagonal, self-locking, with counterbore and captive washer, with MJ threads, classifications: 1 100 MPa (at ambient tempera
21、ture)/235 C, 1 100 MPa (at ambient temperature)/315 C and 1 100 MPa (at ambient temperature)/425 C Dimensions. ISO 8788, Aerospace Nuts, metric Tolerances of form and position. EN 2424, Aerospace series Marking of aerospace products. EN 2516, Aerospace series Passivation of corrosion resisting steel
22、s and decontamination of nickel base alloys. EN 2786, Aerospace series Electrolytic silver plating of fasteners. 3)EN 9100, Aerospace series Quality management systems Requirements (based on ISO 9001:2000) and Quality systems Model for quality assurance in design, development, production, installati
23、on and servicing (based on ISO 9001:1994). EN 9133, Aerospace series Quality management systems Qualification procedure for aerospace standard parts. TR 3791, Aerospace series Materials for self-locking nuts, threaded inserts and screw thread inserts of temperature classes 425 C. 4)1) Corresponds to
24、 the minimum tensile stress which the nut is able to withstand at ambient temperature without breaking or cracking when tested with a bolt of a higher strength class. 2) Maximum temperature that the nut is able to withstand, without permanent alteration to its original characteristics, after ambient
25、 temperature has been restored. The maximum temperature is conditioned by the dimensions. 3) Published as ASD Prestandard at the date of publication of this standard. 4) Published as ASD Technical Report at the date of publication of this standard. EN 3431:2007Licensed Copy: Wang Bin, ISO/EXCHANGE C
26、HINA STANDARDS, 18/04/2008 02:45, Uncontrolled Copy, (c) BSI5 3 Required characteristics 3.1 Configuration - Dimensions - Masses See Figure 1 and Table 1. Dimensions and tolerances are in conformity with ISO 8538, expressed in millimetres and apply after surface treatment. Details of form not stated
27、 are at the manufacturers option. 3.2 Tolerances of form and position ISO 8788 3.3 Materials TR 3791 3.4 Surface treatment Nut: EN 2786, thickness: on external surfaces: 5 m to 15 m; on pitch diameter: 5 m min. for nuts MJ6 and larger. Nuts MJ5 and smaller shall show complete coverage over complete
28、profile. Washer: EN 2516, process class appropriate to the material. EN 3431:2007Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 18/04/2008 02:45, Uncontrolled Copy, (c) BSI6 These values in micrometres apply before surface treatment. They do not apply to threads and sheared edges the surface
29、 texture of which will be asachieved by usual manufacturing methods. Remove sharp edges 0,1 to 0,4 Key 1 Washer shall be free to rotate on the nut 2 Form out-at-round in this area to achieve the self-locking torque requirements (Tool marks acceptable). 3 Thread 4 Chamfer radius or broken edge 5 Mark
30、ing aBearing surface diameter of the washer bWrench pad engagement Figure 1 Table 1 E b F bG H J K L M N P Diameter code Thread a min. max. max. min. min. max. min. min. min. Mass c 030 MJ30,5-4H6H 4,2 4 6,7 4,6 3,4 5,2 3,8 1,2 1,6 0,4 040 MJ40,7-4H6H 5,3 5 8,4 6,2 4,4 6,4 4,80,4 1,5 2,2 0,85 050 MJ
31、50,8-4H6H 6,5 6 9,6 7,4 5,5 7,6 5,8 2 2,4 1,15 060 MJ61-4H5H 7,6 7 11,1 8,1 6,5 9 6,8 2,3 1,6 070 MJ71-4H5H 8,7 8 h12 13,3 9 7,5 11 8 2,7 2,6 080 MJ81-4H5H 10,9 10 14,6 9,9 8,5 12 9 3,2 2,7 3,8 100 MJ101,25-4H5H 13,2 12 17,2 12 10,5 14,7 11 3,8 7,5 120 MJ121,25-4H5H 15,5 14 h13 21 13,8 12,5 18,5 13
32、0,6 4,5 3 11 aln accordance with ISO 5855-2. ln the self-locking zone the tolerances apply before forming out-of-round. bThese dimensions apply before forming out-of-round, but finished nuts shall fit a standard socket wrench. cApproximate values (kg/1 000 pieces), calculated on the basis of 7,85 kg
33、/dm3, given for information purposes only 6,3 1,6 EN 3431:2007Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 18/04/2008 02:45, Uncontrolled Copy, (c) BSI7 4 Designation EXAMPLE Description block NUT Identity block EN 3431050 Number of this standard Diameter code (see Table 1) NOTE If necessa
34、ry, the code I9005 shall be placed between the description block and the identity block. 5 Marking EN 2424, style N. See Figure 1. 6 Technical specification ISO 5858, except for: Approval of manufacturers: see EN 9100; Qualification of products: see EN 9133. EN 3431:2007Licensed Copy: Wang Bin, ISO/
35、EXCHANGE CHINA STANDARDS, 18/04/2008 02:45, Uncontrolled Copy, (c) BSIBS EN BSILicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 18/04/2008 02:45, Uncontrolled Copy, (c) BSI389 Chiswick High RoadLondonW4 4AL3431:2007BSI British Standards InstitutionBSI is the independent national body responsib
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