1、BRITISH STANDARD AEROSPACE SERIES BS EN 3741:2004 Nuts, clip, metric Installation holes and assembly The European Standard EN 3741:2004 has the status of a British Standard ICS 49.030.30 BS EN 3741:2004 This British Standard was published under the authority of the Standards Policy and Strategy Comm
2、ittee on 5 January 2005 BSI 5 January 2005 ISBN 0 580 45185 2 National foreword This British Standard is the official English language version of EN 3741:2004. It supersedes BS EN 3741:2003 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee ACE/12, Aeros
3、pace 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 which implement international or European publications referred to in this document may be
4、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 publication does not purport to include all the necessary provisions of a contract. Users are r
5、esponsible 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/European committee any enquiries on the interpretation, or proposals for change, and ke
6、ep 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 page, pages 2 to 7 and a back cover. The BSI copyright notice displayed in this document in
7、dicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN3741 November2004 ICS49.030.30 SupersedesEN3741:2003 Englishversion AerospaceseriesNuts,clip,metricInstallationholesand assembly Sriearospatialecrousp
8、incer,mtriquesTrous dinstallationetmontage LuftundRaumfahrtKlemmuttern,metrisch EinbaulcherundMontage ThisEuropeanStandardwasapprovedbyCENon11September2003. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalst
9、andardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheCentralSecretariatortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertherespon
10、sibilityofaCENmemberintoitsownlanguageandnotifiedtotheCentralSecretariathasthesamestatusast heofficial versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,Cyprus,CzechRepublic,Denmark,Estonia,Finland,France, Germany,Greece,Hungary,Iceland,Ireland,Italy,Latvia,Lithuania,Luxembourg,Malt
11、a,Netherlands,Norway,Poland,Portugal, Slovakia, Slovenia,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2004CEN Allrightsofexploitationinanyformandbyanymeansreserved
12、worldwideforCENnationalMembers. Ref.No.EN3741:2004:E EN 3741:2004 (E) 2 Contents Page Foreword3 1 Scope 4 2 Normative references 4 3 Principle4 4 Design instructions .4 4.1 Support design 4 4.1.1 Installation A: “on flank of support“4 4.1.2 Installation B: “with slot“5 4.1.3 Dimensions.5 4.2 Type of
13、 installation 5 4.2.1 Installation A 5 4.2.2 Installation B 6 5 Indication on drawings6 5.1 Definition drawing .6 5.2 Assembly drawing.6 6 Designation 7 EN 3741:2004 (E) 3 Foreword This document (EN 3741:2004) has been prepared by the European Association of Aerospace Manufacturers - Standardization
14、 (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 its presentation to CEN. This European Standard shall be gi
15、ven 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 3741:2003. According to the CEN/CENELEC Internal Regulations, t
16、he 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, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Pol
17、and, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 3741:2004 (E) 4 1 Scope This standard specifies the characteristics of the installation holes required for the utilization of clip nuts with design configuration to EN-Standards for aerospace applications. 2 Normati
18、ve 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 3726, Aerospace series Nuts, sel
19、f-locking, clip, in heat resisting steel FE-PA2601 (A286), MoS 2coated Classification: 1 100 MPa (at ambient temperature) / 425 C 3 Principle The self-locking clip nuts are parts held in place on their support by the elastic action of the nut cage. A centering piece located on the tab of the cage en
20、sures the correct installation of the clip nut. Self-locking is ensured by the distortion of the last nut end threads. See Figure 1. Key 1 nut 2 cage 3 centering piece 4 support Figure 1 4 Design instructions 4.1 Support design 4.1.1 Installation A: “on flank of support“ See Figures 2 and 3. EN 3741
21、:2004 (E) 5 Figure 2 Figure 3 4.1.2 Installation B: “with slot“ See Figures 4 and 5. Key 1 F 1 or F 2 aMinimum zone allowing the passage of the tabs depending of the mounting face (see Figure 5). All the shapes capable of enveloping this minimum zone are acceptable. Figure 4 Figure 5 4.1.3 Dimension
22、s See Table 1. Table 1 Dimensions in millimetres C D E F 1F 2Support thickness Diameter code Thread 0,25 max. min. min. min. min. max. min. 040 MJ4X0,7 4H6H 7,1 7 13 050 MJ5X0,8 4H6H 7,5 7 14 14 060 MJ6X1 4H5H 9,5 9,1 8,6 19,5 6,5 16 2 0,9 4.2 Type of installation 4.2.1 Installation A install the cl
23、ip nut on the edge of the support; apply pressure on the cage as illustrated on Figure 3, until the centering piece clears the edge of the support; push the clip nut until the centering piece locates in the hole. EN 3741:2004 (E) 6 4.2.2 Installation B In the case of assembly on inner panels: slide
24、the cage through the support access hole, as illustrated on Figure 5; proceed until the centering piece locates in the hole. 5 Indication on drawings 5.1 Definition drawing EXAMPLE: see Figure 6. Key aWay of assembly Figure 6 5.2 Assembly drawing EXAMPLE: see Figure 7. Key 1 clip nut EN 3726-050 Ass
25、embly EN 3741-050A Figure 7 EN 3741:2004 (E) 7 6 Designation EXAMPLE Identity block EN3741-050A Number of this standard Diameter code (see Table 1) Type of installation (see 4.2) BS EN 3741:2004 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent nationa
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