1、BRITISH STANDARDBS EN 3712:2007Aerospace series Nuts, anchor, self-locking, one lug, fixed, reduced series, with counterbore, in steel, cadmium plated, MoS2lubricated Classification: 1 100 MPa (at ambient temperature) / 235 CICS 49.030.30g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g4
2、4g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 3712:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 October 2008 BSI 2008ISBN 978 0 580 56
3、628 8National forewordThis British Standard is the UK implementation of EN 3712:2007.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
4、secretary.This 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 ST
5、ANDARD NORME EUROPENNE EUROPISCHE NORM EN 3712 June 2007 ICS 49.030.30 English Version Aerospace series - Nuts, anchor, self-locking, one lug, fixed, reduced series, with counterbore, in steel, cadmium plated, MoS2lubricated - Classification: 1 100 MPa (at ambient temperature) / 235 C Srie arospatia
6、le - crous river, freinage interne, fixes, simple patte, srie reduite, avec chambrage, en acier, cadmis, lubrifis MoS2- Classification : 1 100 MPa ( temprature ambiante) / 235 C Luft-und Raumfahrt - Annietmuttern, selbstsichernd, einseitiger verkrzter Flansch, mit zylindrischer Aussenkung, aus Stahl
7、, verkadmet, MoS2geschmiert - Klasse: 1 100 MPa (bei Raumtemperatur) / 235 C This European Standard was approved by CEN on 20 April 2006. 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 nationa
8、l standard without any alteration. 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
9、 other language made by translation 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, Est
10、onia, Finland, France, Germany, Greece, 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 EUR
11、OPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2006 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 3712:2007: E2 Contents Page Foreword3 1 Scope 4 2 Normative references 4 3 Required characteris
12、tics.5 4 Designation 7 5 Marking .7 6 Technical specification .7 BS EN 3712:20073 Foreword This document (EN 3712:2007) 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
13、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 standard, either by publication of an identical text or by
14、 endorsement, at the latest by December 2007, and conflicting national standards shall be withdrawn at the latest by December 2007. 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 f
15、or 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 Republic, Denmark, Estonia, Finland, France, Germa
16、ny, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 3712:20074 1 Scope This standard specifies characteristics for one lug, reduced series, cou
17、nterbored, fixed anchor nuts, with a self-locking feature achieved by forming the upper portion out-of-round, in steel, cadmium plated, MoS2lubricated, classification 1 100 MPa 1)/ 235 C. 2)2 Normative references The following referenced documents are indispensable for the application of this docume
18、nt. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 3191, Aerospace Nuts, anchor, self-locking, fixed, single lug, reduced series, with counterbore, with MJ threads, classifications: 1
19、 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 5855-2, Aerospace MJ threads Part 2: Limit dimensions for bolts and nuts. ISO 5858, Aerospace Nuts, self-locking, with maximum operating temperature less tha
20、n or equal to 425 C Procurement specification. ISO 8788, Aerospace Nuts, metric Tolerances of form and position. EN 2133, Aerospace series Cadmium plating of steels with specified tensile strength 1 450 MPa, copper, copper alloys and nickel alloys. EN 2424, Aerospace series Marking of aerospace prod
21、ucts. EN 2491, Aerospace series Molybdenum disulphide dry lubricants Coating methods. EN 2542, Aerospace series Steel FE-PL43S Annealed Bar and wire De 40 mm for prevailing torque nuts.3) EN 2543, Aerospace series Steel FE-PL43S Annealed Sheet and strip 0,3 a 2 mm for prevailing torque nuts. 3)EN 91
22、00, Aerospace series Quality management systems Requirements (based on ISO 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
23、for aerospace standard parts. 1) Corresponds to strength class of the associated bolt, the 100 per cent load of which it is able to withstand, when tested at ambient temperature, without breaking or cracking. 2) Maximum temperature that the nut is able to withstand, without permanent alteration of i
24、ts original characteristics, after ambient temperature has been restored. The maximum temperature is conditioned by the cadmium plating. 3) Published as ASD Prestandard at the date of publication of this standard. BS EN 3712:20075 3 Required characteristics 3.1 Configuration Dimensions Masses See Fi
25、gure 1 and Table 1. 3.2 Materials EN 2542 or EN 2543 3.3 Surface treatment EN 2133, 5 m minimum on threads and all areas which can be contacted by a 20 mm diameter ball. On all other areas, a continuous cadmium plating shall be present. EN 2491, thickness not specified BS EN 3712:20076 Remove shard
26、edges 0,1 mm to 0,4mm Y-Y Key 1 2 holes S 2 Form out-of-round in this area to achieve the self-locking torque requirement. Tooling marks are permitted in this area. 3 Thread 4 Radius or chamfer 5 Radius = K/2 6 Marking aThese values, in micrometres, apply before cadmium plating and MoS2lubrication.
27、The values do not apply to threads, punched holes or sheared edges, the surface texture of which will be as achieved by usual manufacturing methods. Details of form, not stated, are at manufacturers option. Figure 1 a 3,2 6,3 BS EN 3712:20077 Table 1 Dimensions in millimetres Diameter code Thread a
28、E F G min.H min.J bmax.K max. L max.M max.N cmax. (R) S + 2,20 Mass kg/1 000 approx. 040 MJ4 0,7 4H6H 6 4,4 2,2 6,2 8 18,2 5,8 1,2 050 MJ5 0,8 4H6H 7 5,5 2,4 7,3 9 19,7 6,9 1,1 2,5 1,6 060 MJ6 1 4H5H 8 5,5 6,5 2,7 8,7 10 21,7 8,1 1,4 3 2,5 2,4 These dimensions are in accordance with ISO 3191. Tolera
29、nces of form and position shall be in conformity with ISO 8788. Dimensions and tolerances apply after cadmium plating but before MoS2lubrication. aIn conformity with ISO 5855-2. In the self-locking zone, the tolerances apply before forming out-of-round. bIs to sharp corners (chamfered) or point of t
30、angency (radiused). cIs applicable at the rivet hole location. 4 Designation EXAMPLE Description block NUT Identity block EN3712-060 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 E
31、N 2424, style N. See Figure 1. 6 Technical specification ISO 5858 except for: approval of manufacturers: EN 9100; qualification of products: EN 9133. BS EN 3712:2007BS EN 3712:2007BSI Group Headquarters389 Chiswick High Road,London W4 4AL, UKTel +44 (0)20 8996 9001Fax +44 (0)20 8996 Standards Insti
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