1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 3768:2012Aerospace series Nuts,anchor, self-locking, one lug,fixed, reduced series, withcounterbore, in heat resistingsteel, MoS2 lubricated Classification: 1 100 MPa (atam
2、bient temperature)/315 CBS EN 3768:2012 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 3768:2012. The UK participation in its preparation was entrusted to TechnicalCommittee ACE/12, Aerospace fasteners and fastening systems. A list of organizations represented
3、on this committee 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. The British Standards Institution 2012Published by BSI Standards Limited 2012ISBN 978 0 580 76579
4、7 ICS 49.030.30 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 March 2012.Amendments issued since publicationDate T e x t a f f e c t e dBS EN 3768:2012EUROP
5、EAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 3768 March 2012 ICS 49.030.30 English Version Aerospace series - Nuts, anchor, self-locking, one lug, fixed, reduced series, with counterbore, in heat resisting steel, MoS2 lubricated - Classification: 1 100 MPa (at ambient temperature)/315 C Srie aros
6、patiale - crous river, freinage interne, fixes, simple patte, srie rduite, avec chambrage, en acier rsistant chaud, lubrifis MoS2 - Classification: 1 100 MPa ( temprature ambiante)/315 C Luft- und Raumfahrt - Annietmuttern, selbstsichernd, einseitiger verkrzter Flansch, mit zylindrischer Aussenkung,
7、 aus hochwarmfestem Stahl, MoS2-geschmiert - Klasse: 1 100 MPa (bei Raumtemperatur)/315 C This European Standard was approved by CEN on 23 December 2011. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the sta
8、tus 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-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, G
9、erman). 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-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croa
10、tia, 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, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR S
11、TANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 3768:2012: EBS EN 3768:2012EN 3768:2012 (E) 2 Co
12、ntents Page Foreword 31 Scope 42 Normative references 43 Required characteristics .53.1 Configuration Dimensions Masses 53.2 Materials .53.3 Surface treatment 54 Designation 75 Marking .76 Technical specification .7BS EN 3768:2012EN 3768:2012 (E) 3 Foreword This document (EN 3768:2012) has been prep
13、ared 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 received the approval of the National Associations and the Official Services of the member countr
14、ies 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 September 2012, and conflicting national standards shall be withdrawn at the latest by September 2012.
15、 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. According to the CEN/CENELEC Internal Regulations, the national standards organizatio
16、ns of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
17、 Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 3768:2012EN 3768:2012 (E) 4 1 Scope This European Standard specifies the characteristics of one lug, reduced series, counterbored fixed anchor nuts, with a self-locking feature achieved by forming the uppe
18、r portion out-of-round, in heat resisting steel, MoS2lubricated. Classification: 1 100 MPa1)/315 C2)2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited
19、 applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 2398, Aerospace series Heat resisting steel FE-PA2601 (X6NiCrTiMoV26-15) Rm 900 MPa Bars for machined bolts D 25 mm EN 2399, Aerospace series Heat resisting steel FE-PA2601 (X4NiCrT
20、iMoV26-15) Rm 900 MPa Bars for forged bolts D 25 mm EN 2424, Aerospace series Marking of aerospace products EN 2491, Aerospace series Molybdenum disulphide dry lubricants Coating methodsEN 3638, Aerospace series Heat resisting alloy FE-PA2601 (X6NiCrTiMoV26-15) Consumable electrode remelted Solution
21、 and precipitation treated Sheet, strip and plate - 0,5 mm a 10 mmEN 3639, Aerospace series Heat resisting steel FE-PA92HT cold worked and softened Bars and wires for continuous cold forging or extrusion of fasteners 3 mm D 30 mm Rm 900 MPa 3) EN 9100, Quality Management Systems Requirements for Avi
22、ation, Space and Defense Organizations EN 9133, Aerospace series Quality management systems Qualification Procedure for Aerospace Standard Parts TR 3791, Aerospace series Materials for all metal self-locking nuts and thin wall inserts of temperature classes 425 C4)ISO 3191, Aerospace Nuts, anchor, s
23、elf-locking, fixed, single lug, reduced series, with counterbore, with MJ threads, classifications: 1 100 MPa (at ambient temperature)/235 degrees C, 1 100 MPa (at ambient temperature)/315 degrees C and 1 100 MPa (at ambient temperature)/425 degrees C Dimensions ISO 5855-2, Aerospace MJ threads Part
24、 2: Limit dimensions for bolts and nuts ISO 5858, Aerospace Nuts, self-locking, with maximum operating temperature less than or equal to 425 degrees C Procurement specification ISO 8788, Aerospace Nuts, metric Tolerances of form and position 1) Corresponds to strength class of the associated bolt, t
25、he 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 to its original characteristics, after ambient temperature has been restored. The maximum te
26、mperature is conditioned by the surface treatment. 3) In preparation at the date of publication of this standard. 4) Published as ASD-STAN Technical Report at the date of publication of this standard. BS EN 3768:2012EN 3768:2012 (E) 5 3 Required characteristics 3.1 Configuration Dimensions Masses Se
27、e Figure 1 and Table 1. Dimensions and tolerances are: in conformity with ISO 3191, expressed in millimetres and apply before MoS2lubrication. Form and position tolerances shall be in conformity with ISO 8788. 3.2 Materials EN 2398, EN 2399, EN 3638, EN 3639 or TR 3791. 3.3 Surface treatment EN 2491
28、, thickness not specified. Remove sharp edges 0,1 to 0,4 BS EN 3768:2012EN 3768:2012 (E) 6 Details of form not stated are at the manufacturers option. Key a These values in micrometres apply prior to surface treatment. The values do not apply to threads, punched holes or sheared edges, the surface t
29、exture of which will be as achieved by usual manufacturing methods. b Form out-of-round in this area to achieve the self-locking requirement Tooling marks are permitted in this area. c Radius or chamfer 1 Thread 2 Marking Figure 1 Table 1 Diameter code ThreadaE F G H JbK L M NcR S Mass kg/1000pieces
30、approx.min. min. max. max. max. max. max. 02,0+040 MJ40,7-4H6H 6 5,5 4,4 2,2 6,2 8 18,2 5,8 1,1 2,5 2,5 1,2 050 MJ50,8-4H6H 7 5,5 2,4 7,3 9 19,7 6,9 1,6 060 MJ61-4H5H 8 6,5 2,7 8,7 10 21,7 8,1 1,4 3 2,4 aIn accordance with ISO 5855-2. In the self-locking zone, the tolerances apply before forming out
31、-of-round. bIs to sharp corners (chamfered) or point of tangency (radiused). cIs applicable at the rivet hole location. BS EN 3768:2012EN 3768:2012 (E) 7 4 Designation EXAMPLE Description block Nut Identity block EN3768060 Number of this standard Diameter code (see Table 1) NOTE If necessary, the or
32、iginator code 19005 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. This page deliberately left blankThis pag
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