EN 3431-2007 en Aerospace series - Nuts hexagonal self-locking with counterbore and captive washer in heat resisting steel silver plated - Classification 1 100 MPa (at ambient temp.pdf

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1、BRITISH STANDARDBS EN 3431:2007Aerospace series Nuts, hexagonal, self-locking, with counterbore and captive washer, in heat resisting steel, silver plated Classification: 1 100 MPa (at ambient temperature) / 425 CICS 49.030.30g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53

2、g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 3431:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 January 2008 BSI 2008ISBN 978 0 580 60328 0Nationa

3、l 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 obtained on request to its secretary.Th

4、is publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations. Amendments/corrigenda issued since publicationDate CommentsEUROPEAN STANDARD NORM

5、E EUROPENNE EUROPISCHE NORM EN 3431 December 2007 ICS 49.030.30 English Version Aerospace series - Nuts, 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 hexagona

6、ux, freinage interne, avec chambrage et rondelle captive, en acier rsistant chaud, argents - Classification : 1 100 MPa ( temprature ambiante) / 425 C Luft- und Raumfahrt - Sechskantmuttern, selbstsichernd, mit zylindrischer Aussenkung und Brdelscheibe, aus hochwarmfestem Stahl, versilbert - Klasse:

7、 1 100 MPa (bei Raumtemperatur) / 425 C This European Standard was approved by CEN on 5 November 2007. 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.

8、Up-to-date lists and bibliographical references concerning such national standards may be obtained on 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

9、 under the responsibility of a CEN member into its own language and notified to the CEN Management Centre 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, Gre

10、ece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Managem

11、ent Centre: rue de Stassart, 36 B-1050 Brussels 2007 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 3431:2007: E2 Contents Page Foreword3 1 Scope 4 2 Normative references 4 3 Required characteristics.5 4 Designation 7 5 Marking .7

12、 6 Technical specification .7 EN 3431:20073 Foreword This document (EN 3431:2007) has been prepared by the Aerospace and Defence Industries Association of Europe - Standardization (ASD-STAN). After enquiries and votes carried out in accordance with the rules of this Association, this Standard has re

13、ceived 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 standard, either by publication of an identical text or by endorsement, at the latest by June 20

14、08, 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. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights.

15、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 Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,

16、Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. EN 3431:20074 1 Scope This standard specifies the characteristics of self-locking hexagonal nuts, with counterbore and captive washer, in heat

17、resisting steel, silver plated. Classification: 1 100 MPa 1)/ 425 C 2). 2 Normative references The following 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

18、 document (including any amendments) applies. ISO 5855-2, Aerospace MJ threads Part 2: Limit dimensions for 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-lock

19、ing, with counterbore and captive washer, with MJ threads, classifications: 1 100 MPa (at ambient temperature)/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

20、 series Marking of aerospace products. EN 2516, Aerospace series Passivation of corrosion resisting steels 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

21、9001:2000) and Quality systems Model for quality assurance in design, development, production, installation 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-

22、locking nuts, threaded inserts and screw thread inserts of temperature classes 425 C. 4)1) Corresponds to 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

23、the nut is able to withstand, without permanent alteration to its original characteristics, after ambient 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 Technica

24、l Report at the date of publication of this standard. EN 3431:20075 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

25、stated 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 com

26、plete profile. Washer: EN 2516, process class appropriate to the material. EN 3431:20076 These values in micrometres apply before surface treatment. They do not apply to threads and sheared edges the surface texture of which will be asachieved by usual manufacturing methods. Remove sharp edges 0,1 t

27、o 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 Marking aBearing surface diameter of the washer bWrench pad engagement Figure 1 Table 1 E b F bG

28、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 MJ50,8-4H6H 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

29、 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 0,6 4,5 3 11 aln accordance with ISO 5855-2. ln the self-locking zone the tolerances apply be

30、fore 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/dm3, given for information purposes only 6,3 1,6 EN 3431:20077 4 Designation EXAMPLE Descrip

31、tion block NUT Identity block EN 3431050 Number of this standard Diameter code (see Table 1) NOTE If necessary, 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 m

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