1、Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 19/12/2008 01:50, Uncontrolled Copy, (c) BSIg49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58f
2、ixed, reduced series, with counterbore, in steel, cadmium plated, MoS2lubricated Classification: 1 100 MPa (at ambient temperature) / 235 CICS 49.030.30Aerospace series Nuts, anchor, self-locking, one lug, BRITISH STANDARDBS EN 3712:2007BS EN 3712:2007Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STAN
3、DARDS, 19/12/2008 01:50, Uncontrolled Copy, (c) BSIThis British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 October 2008 BSI 2008ISBN 978 0 580 56628 8Amendments/corrigenda issued since publicationDate CommentsCompliance with a British Standard can
4、not confer immunity from legal obligations.National 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 commit
5、tee can be 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 3712 June 2007 ICS 49.030.30 English Version Aerospace serie
6、s - 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 arospatiale - crous river, freinage interne, fixes, simple patte, srie reduite, avec chambrage, en acier, cadmi
7、s, lubrifis MoS2- Classification : 1 100 MPa ( temprature ambiante) / 235 C Luft-und Raumfahrt - Annietmuttern, selbstsichernd, einseitiger verkrzter Flansch, mit zylindrischer Aussenkung, aus Stahl, verkadmet, MoS2geschmiert - Klasse: 1 100 MPa (bei Raumtemperatur) / 235 C This European Standard wa
8、s 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 national standard without any alteration. Up-to-date lists and bibliographical references concerning such nat
9、ional 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 under the responsibility of a CEN member into its own language and
10、 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, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembour
11、g, 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 Management Centre: rue de Stassart, 36 B-1050 Brussels 2006 CEN All rights
12、 of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 3712:2007: ELicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 19/12/2008 01:50, Uncontrolled Copy, (c) BSI2 Contents Page Foreword3 1 Scope 4 2 Normative references 4 3 Required characteristic
13、s.5 4 Designation 7 5 Marking .7 6 Technical specification .7 BS EN 3712:2007Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 19/12/2008 01:50, Uncontrolled Copy, (c) BSI3 Foreword This document (EN 3712:2007) has been prepared by the Aerospace and Defence Industries Association of Europe - St
14、andardization (ASD-STAN). After enquiries 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 sh
15、all be given the status of a national standard, either by publication of an identical text or by 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
16、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. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standa
17、rd: Austria, Belgium, Bulgaria, Cyprus, Czech 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. B
18、S EN 3712:2007Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 19/12/2008 01:50, Uncontrolled Copy, (c) BSI4 1 Scope This standard specifies characteristics for one lug, reduced series, counterbored, fixed anchor nuts, with a self-locking feature achieved by forming the upper portion out-of-ro
19、und, 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 document. For dated references, only the edition cited applies. For undated references, the latest edition of t
20、he referenced document (including any amendments) applies. ISO 3191, Aerospace Nuts, anchor, self-locking, fixed, single lug, reduced series, with counterbore, with MJ threads, classifications: 1 100 MPa (at ambient temperature)/235 C, 1 100 MPa (at ambient temperature)/315 C and 1 100 MPa (at ambie
21、nt 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 than or equal to 425 C Procurement specification. ISO 8788, Aerospace Nuts, metric Tolerances of form and po
22、sition. 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 products. EN 2491, Aerospace series Molybdenum disulphide dry lubricants Coating methods. EN 2542, Aerospace
23、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 9100, Aerospace series Quality management systems Requirements (based on ISO 9001:2000) and Quality systems
24、 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. 1) Corresponds to strength class of the associated bolt, the 100 per cent l
25、oad 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 its original characteristics, after ambient temperature has been restored. The maximum temperature is cond
26、itioned by the cadmium plating. 3) Published as ASD Prestandard at the date of publication of this standard. BS EN 3712:2007Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 19/12/2008 01:50, Uncontrolled Copy, (c) BSI5 3 Required characteristics 3.1 Configuration Dimensions Masses See Figure 1
27、 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 3712:2007Licensed Copy: Wang B
28、in, ISO/EXCHANGE CHINA STANDARDS, 19/12/2008 01:50, Uncontrolled Copy, (c) BSI6 Remove shard 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/
29、2 6 Marking aThese values, in micrometres, apply before cadmium plating and MoS2lubrication. 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.
30、Figure 1 a 3,2 6,3 BS EN 3712:2007Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 19/12/2008 01:50, Uncontrolled Copy, (c) BSI7 Table 1 Dimensions in millimetres Diameter code Thread a 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
31、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. Tolerances of form and position shall be in conformity with ISO 8788. Dimensions and tolerances apply after cadmiu
32、m 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 tangency (radiused). cIs applicable at the rivet hole location. 4 Designation EXAMPLE Description block NUT I
33、dentity 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 EN 2424, style N. See Figure 1. 6 Technical specification ISO 5858 except for: approval of manufacturers: EN
34、9100; qualification of products: EN 9133. BS EN 3712:2007Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 19/12/2008 01:50, Uncontrolled Copy, (c) BSIBS EN 3712:2007BSI Group Headquarters389 Chiswick High Road,London W4 4AL, UKLicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 19/12/2008 0
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