1、BRITISH STANDARD AEROSPACE SERIES BS EN 3726:2004 Nuts, self-locking, clip, in heat resisting steel FE-PA2601 (A286), MoS 2coated Classification: 1 100 MPa (at ambient temperature) / 425 C The European Standard EN 3726:2004 has the status of a British Standard ICS 49.030.30 BS EN 3726:2004 This Brit
2、ish Standard was published under the authority of the Standards Policy and Strategy Committee on 5 January 2005 BSI 5 January 2005 ISBN 0 580 45189 5 National foreword This British Standard is the official English language version of EN 3726:2004. It supersedes BS EN 3726:2003 which is withdrawn. Th
3、e UK participation in its preparation was entrusted to Technical Committee ACE/12, Aerospace fasteners and fastening systems, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards whi
4、ch implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publica
5、tion does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international
6、/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title pag
7、e, pages 2 to 6, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date Comments EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 3726 November 2004 ICS 49.030.30 Su
8、persedes EN 3726:2003 English version Aerospace series - Nuts, self-locking, clip, in heat resisting steel FE-PA2601 (A286), MoS2 coated - Classification: 1 100 MPa (at ambient temperature) / 425 C Srie arospatiale - crous pincer, freinage interne, en acier rsistant chaud FE-PA2601 (A286), revtus Mo
9、S2 - Classification : 1 100 MPa ( temprature ambiante ) / 425 C Luft- und Raumfahrt - Klemmuttern, selbstsichernd, aus hochwarmfestem Stahl FE-PA2601 (A286), MoS2- beschichtet - Klasse: 1 100 MPa (bei Raumtemperatur) / 425 C This European Standard was approved by CEN on 11 September 2003. CEN member
10、s 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 national standards may be obtained on application
11、 to the Central Secretariat 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 notified to the Central Secretariat has the sam
12、e status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, S
13、lovenia, 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 2004 CEN All rights of exploitation in any form and by any means reserved worldwide for
14、CEN national Members. Ref. No. EN 3726:2004: E EN 3726:2004 (E) 2 Contents Page Foreword3 1 Scope 4 2 Normative references 4 3 Required characteristics.4 4 Designation 6 5 Marking .6 6 Technical specification .6 EN 3726:2004 (E) 3 Foreword This document (EN 3726:2004) has been prepared by the Europe
15、an Association of Aerospace Manufacturers - Standardization (AECMA-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 AECMA, prior to
16、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 2005, and conflicting national standards shall be withdrawn at the latest by May 2005. This document supersedes EN 3726
17、:2003. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Lat
18、via, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 3726:2004 (E) 4 1 Scope This standard specifies the characteristics of self-locking clip nuts in FE-PA2601, MoS 2coated, for aerospace applications. Classif
19、ication: 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 document (including any amendments) appl
20、ies. ISO 5855-2, Aerospace MJ threads Part 2: Limit dimensions for bolts and nuts EN 2424, Aerospace series Marking of aerospace products EN 2491, Aerospace series Molybdenum disulphide dry lubricants Coating methods EN 3638, Aerospace series Heat resisting alloy FE-PA2601 (X6NiCrTiMoV26-15) Consuma
21、ble electrode remelted Solution and precipitation treated Sheet, strip and plate 0,5 mm a 10 mm 3)EN 3639, Aerospace series Heat resisting alloy FE-PA2601 Softened and cold worked Wire for forged fasteners D 15 mm 900 MPa R m 1 100 MPa 3)EN 3752, Aerospace series Nuts, self-locking, MJ threads, in h
22、eat resisting steel FE-PA2601 (A286), MoS 2coated Classification: 1 100 MPa (at ambient temperature) / 425 C Technical specification 3 Required characteristics 3.1 Configuration Dimensions Tolerances Masses The configuration of the clip nut in this standard, see Figure 1, is given as an example only
23、. Forms not stated are at the manufacturers option. Only the maximum overall dimensions given in the Table 1 and the interchangeability requirements are imposed. The minimum dimensions are limited by the requirements of the technical specification. Dimensions and tolerances are in millimetres. They
24、apply before MoS 2coating. 3.2 Materials Nut element: EN 3638 or EN 3639 Clip: EN 3638 3.3 Surface treatment EN 2491 1) Correspond 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.
25、2) Maximum test temperature of the parts 3) Published as AECMA Prestandard at the date of publication of this standard EN 3726:2004 (E) 5 Key 1 form out-of-round in this area to achieve the self-locking requirement (tooling marks permissible). 2 thread 3 marking 4 pitch diameter Figure 1 Table 1 Thr
26、ead aA F H K L M N P R T V W X Code Designation 0,5 max. max. 0,5 0,5 min 0,5 0,15 0,5 0,5 0,05 max. min. Mass kg/1 000 parts Panel thickness range 040 MJ40,7-4H6H 5,8 2,5 050 MJ50,8-4H6H 5,5 6,45 6,9 7 5,2 0,50 13,0 0,25 2,6 060 MJ61-4H5H 8,5 8,05 8,8 2,7 10 1,6 10 6,6 0,75 0,75 0,63 18,5 0,30 4,3
27、0,9 to 2,0 aIn accordance with ISO 5855-2 6,3 EN 3726:2004 (E) 6 4 Designation EXAMPLE Description block NUT Identity block EN3726-060 Number of this standard Thread code (see Table 1) NOTE If necessary, the code I9005 shall be placed between the description block and the identity block. 5 Marking E
28、N 2424, style F, as indicated on Figure 1. 6 Technical specification EN 3752 blankBS EN 3726:2004 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europ
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