1、BRITISH STANDARDBS EN 3241:2008Aerospace series Nuts, self-locking, clip, in heat resisting steel FE-PA 92 HT (A 286), silver coated Classification: 1 100 MPa (at ambient temperature) / 425 CICS 49.030.30g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g
2、3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 3241:2008This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 July 2008 BSI 2008ISBN 978 0 580 60619 9National forewordThis British St
3、andard is the UK implementation of EN 3241:2008.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 committee can be obtained on request to its secretary.This publication does not p
4、urport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.Amendments/corrigenda issued since publicationDate CommentsEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NOR
5、M EN 3241 June 2008 ICS 49.030.30 English Version Aerospace series - Nuts, self-locking, clip, in heat resisting steel FE-PA 92 HT (A 286), silver coated - Classification: 1 100 MPa (at ambient temperature) / 425 C Srie arospatiale - crous pincer, freinage interne, an acier rsistant chaud FE-PA 92 H
6、T (A 286), argents - Classification: 1 100 MPa ( temprature ambiante) / 425 C Luft- und Raumfahrt - Klemmuttern, selbstsichernd, aus hochwarmfestem Stahl FE-PA 92 HT (A 286), versilbert - Klasse: 1 100 MPa (bei Raumtemperatur) / 425 C This European Standard was approved by CEN on 2 February 2008. CE
7、N 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 national standards may be obtained on app
8、lication 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 notified to the CEN Management Centre
9、 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, Luxembourg, Malta, Netherlands, Norway, Poland,
10、 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 2008 CEN All rights of exploitation in any form and by an
11、y means reserved worldwide for CEN national Members. Ref. No. EN 3241:2008: E2 Contents Page Foreword3 1 Scope 4 2 References4 3 Required characteristics.4 3.1 Configuration Dimensions Tolerances Masses.4 3.2 Material .5 3.3 Surface treatment 5 4 Designation 7 5 Marking .7 6 Technical specification
12、.7 BS EN 3241:20083 Foreword This document (EN 3241:2008) has been prepared 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 t
13、he National Associations and the Official Services of the member countries 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 December 2008, and conflicting
14、national standards shall be withdrawn at the latest by December 2008. 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
15、 CEN/CENELEC Internal Regulations, the national standards organizations of the following 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, Lithuani
16、a, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 3241:20084 1 Scope This standard specifies the characteristics of self-locking silver coated clip nuts in FE-PA 92 HT for aerospace applications. Classif
17、ication: 1 100 MPa1)/425 C2)2 References EN 2424 Aerospace series Marking of aerospace products3)EN 2786 Aerospace series Electrolytic silver plating of fasteners4)EN 3152 Aerospace series Propulsion standard parts Nuts, self-locking, in heat resisting steel FE-PA 92 HT (A 286) Classification: 1 100
18、 MPa/425 C Technical specification EN 3638 Aerospace series Heat resisting alloy FE-PA2601(X6NiCrTiMoV26- 15) Consumable electrode remelted Solution and precipitation treated Sheet, strip and plate 0, 5 mm a 10 mm EN 3639 Aerospace series Heat resisting alloy FE-PA2601 Softened and cold worked Wire
19、for forged fasteners D 15 mm 900 MPa Rm 1 100 MPa4)EN 3741 Aerospace series Nuts, clip, metric Installation holes and assembly ISO 5855-1 Aerospace MJ threads Part 1: General requirements ISO 5855-2 Aerospace MJ threads Part 2: Limit dimensions for bolts and nuts 3 Required characteristics 3.1 Confi
20、guration Dimensions Tolerances Masses The configuration of the clip nut in this standard is given as an example only. 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
21、 are limited by the requirements of the technical specification. Dimensions and tolerances to be met after coating. Dimensions and tolerances are in millimetres. 1) The strength class of the bolt concerned which can withstand the load at ambient temperature when tested at 100 % load without cracking
22、 or breaking the nut. 2) Maximum test temperature of the part. 3) Published as ASD standard at the date of publication of this standard. 4) Published as ASD Prestandard at the date of publication of this standard. BS EN 3241:20085 3.2 Material Nut element: EN 3638 or EN 3639. Clip: EN 3638 3.3 Surfa
23、ce treatment Silver coating to EN 2786, coating thickness 5 m to 15 m. On nuts MJ6 and larger, the coating thickness shall be not less than 5 m, measured at the pitch diameter. Nuts MJ5 and smaller shall show complete coverage on the threads. BS EN 3241:20086 All forms are acceptable within limit di
24、mensions. Key 1 Deformation in this area to achieve self locking requirement. Tooling marks acceptable. 2 Dimensions apply after coating. Thread surfaces will be as achieved by normal method of manufacture. 3 Identity Markings 4 Pitch 5 View A-A 6 View B-B 7 Remove sharp edges 0,1 to 0,4. 8 Thread F
25、igure 1 1 5 4 3 2 6 7 8 BS EN 3241:20087 Table 1 Dimensions and masses Thread A F H K L M N P R T V W X Mass Diameter code Designationa 0,5 max. max. 0,5 0,5 min. 0,5 0,15 0,5 0,5 0,05 max. min. kg/100 Panel Thickness Range 040 MJ4 x 0,7 4H6H 5,8 2,5 050 MJ5 x 0,8 4H6H 5,5 6,45 6,9 7 1,6 5,2 0,5 13
26、0,25 2,6 060 MJ6 x 1 4H5H 8,5 8,05 8,8 2,7 10 2,3 10 6,6 0,75 0,75 0,63 18,5 0,3 4,3 0,9 - 2 aThreads to ISO 5855-1 and ISO 5855-2. 4 Designation Example: Description blockNUT Identity block EN 3241 - 060 Number of this standard Diameter code (see Table 1) NOTE If necessary, the design code I 9005 s
27、hall be placed between the description block and the identity block. 5 Marking EN 2424, style F, at the location shown in the figure 1. 6 Technical specification EN 3152 BS EN 3241:2008BS EN 3241:2008BSI Group Headquarters389 Chiswick High Road,London W4 4AL, UKTel +44 (0)20 8996 9001Fax +44 (0)20 8
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