1、BS EN 3757:2009ICS 49.030.30NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDAerospace series Nuts, anchor, self-locking, floating, self-aligning, two lugs, inheat resisting steel,MoS2 lubricated Classification: 900MPa (at ambienttemperature) / 315 CThis British
2、Standardwas published under theauthority of the StandardsPolicy and StrategyCommittee on 30 June2010 BSI 2010ISBN 978 0 580 68570 5Amendments/corrigenda issued since publicationDate CommentsBS EN 3757:2009National forewordThis British Standard is the UK implementation of EN 3757:2009.The UK particip
3、ation in its preparation was entrusted to TechnicalCommittee ACE/12, Aerospace fasteners and fastening systems.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. User
4、s are responsible for its correct application.Compliance with a British Standard cannot confer immunityfrom legal obligations.BS EN 3757:2009EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 3757 November 2009 ICS 49.030.30 English Version Aerospace series - Nuts, anchor, self-locking, floating,
5、self-aligning, two lugs, in heat resisting steel, MoS2 lubricated - Classification: 900 MPa (at ambient temperature) / 315 C Srie arospatiale - crous river, freinage interne, flottants, orientables, double patte, acier rsistant chaud, lubrifis MoS2 - Classification : 900 MPa ( temprature ambiante) /
6、 315 C Luft- und Raumfahrt - Annietmuttern, selbstsichernd, schwenkbar, beiderseitiger Flansch, aus hochwarmfestem Stahl, MoS2-geschmiert - Klasse: 900 MPa (bei Raumtemperatur) / 315 C This European Standard was approved by CEN on 17 October 2009. CEN members are bound to comply with the CEN/CENELEC
7、 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 application to the CEN Management Centre or to any CE
8、N 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 Centre has the same status as the official versions. CEN
9、 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, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Swe
10、den, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2009 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members.
11、 Ref. No. EN 3757:2009: EBS EN 3757:2009EN 3757:2009 (E) 2 Contents Page Foreword 3 1 Scope 4 2 Normative references 4 3 Required characteristics .5 4 Designation 7 5 Marking .7 6 Technical specification .7 BS EN 3757:2009EN 3757:2009 (E) 3 Foreword This document (EN 3757:2009) has been prepared by
12、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 received the approval of the National Associations and the Official Services of the member countries of A
13、SD, 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 May 2010, and conflicting national standards shall be withdrawn at the latest by May 2010. Attention is drawn
14、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. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
15、countries are bound to implement this European Standard: 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,
16、 Spain, Sweden, Switzerland and the United Kingdom. BS EN 3757:2009EN 3757:2009 (E) 4 1 Scope This European Standard specifies the characteristics of self-locking, floating, self-aligning, two lugs anchor nuts, in heat resisting steel, MoS2-lubricated. Classification: 900 MPa 1) / 315 C 2). 2 Normat
17、ive 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 document (including any amendments) applies. EN 2424:2008, Aerospace series Mar
18、king of aerospace products EN 2491, Aerospace series Molybdenum disulphide dry lubricants Coating methods EN 9100, Quality Management Systems Requirements for Aviation, Space and Defense Organizations EN 9133, Aerospace series Quality management systems Qualification procedure for aerospace standard
19、 parts 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 position ISO 12273, Aerospace N
20、uts, anchor, self-locking, floating, self-aligning, two lug, with MJ threads, classifications: 900 MPa (at ambient temperature)/235 C, 900 MPa (at ambient temperature)/315 C and 900 MPa (at ambient temperature)/425 C Dimensions TR 3791, Aerospace series Materials for self-locking nuts, threaded inse
21、rts and screw thread inserts of temperature classes 425 C 3)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 the nut is able to withstand
22、, without permanent alteration to its original characteristics, after ambient temperature has been restored. The maximum temperature is conditioned by the surface treatment. 3) Published as ASD-STAN Technical Report at the date of publication of this standard. BS EN 3757:2009EN 3757:2009 (E) 5 3 Req
23、uired characteristics 3.1 Configuration Dimensions Masses See Figure 1 and Table 1. Dimensions and tolerances are in conformity with ISO 12273, expressed in millimetres and apply before MoS2lubrication. Details of form not stated are at the manufacturers option. 3.2 Tolerances of form and position I
24、SO 8788. 3.3 Materials TR 3791. 3.4 Surface treatment EN 2491, thickness not specified, mandatory on threads, optional on other surfaces. These values in micrometres apply before surface treatment. They do not apply tothreads punched holes or sheared edges, the surface texture of which will be as ac
25、hieved by usual manufacturing methods. Remove sharp edges 0,1 to 0,4. 6,3 3,2 BS EN 3757:2009EN 3757:2009 (E) 6 Key 1 Marking 2 Float inclusive 3 Convex washer 4 Threaded element 5 Thread 6 Form out-of-round in this area to achieve the self-locking torque requirements. Tooling marks are permitted in
26、 this area. 7 Cage a 8 minimum alignment in any direction from central position Figure 1 BS EN 3757:2009EN 3757:2009 (E) 7 Table 1 Diameter code Thread aE F H K L M NbP R S T Z Massc+ 0,2 0 Radial float min. max. max. max. max. min. max. min. 050 MJ50,8-4H6H 8,75 17,5 3,5 15,2 23,7 8,3 0,9 6,63 2,5
27、7,2 0,7 2,6 060 MJ61-4H5H 12,7 25,4 4 17 31,6 10,21,1 7,6 7,8 0,75 5,8 080 MJ81-4H5H 5 20,5 32,6 11,8 11 3,5 3 8,4 9 aIn accordance with ISO 5855-2. In the self-locking zone, the tolerances apply before forming out-of-round. bMeasured at the rivet hole location. cApproximate values (kg/1 000 pieces)
28、, given for information purposes only. 4 Designation EXAMPLE Description block NUT Identity block EN3757060 Number of this standard Diameter code (see Table 1) NOTE If necessary the originator code I9005 shall be placed between the description block and the identity block. 5 Marking EN 2424:2008, st
29、yle N. See Figure 1. 6 Technical specification ISO 5858, except for: Approval of manufacturers: see EN 9100; Qualification of products: see EN 9133. BS EN3757:2009BSI GroupHeadquarters 389Chiswick High Road,London, W4 4AL, UKTel +44 (0)20 8996 9001Fax +44 (0)20 8996 - British Standards InstitutionB
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