1、BRITISH STANDARDBS EN 3148:2008Aerospace series Shank nuts, self-locking, flange restrained Installation procedureICS 49.030.30g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g6
2、0g53g44g42g43g55g3g47g36g58BS EN 3148:2008This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 May 2008 BSI 2008ISBN 978 0 580 62855 9National forewordThis British Standard is the UK implementation of EN 3148:2008. The UK participation in its p
3、reparation 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 purport to include all the necessary provisions of a contract. Users are respo
4、nsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.Amendments/corrigenda issued since publicationDate CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 3148April 2008ICS 49.030.30English VersionAerospace series - Shank nuts, se
5、lf-locking, flange restrained -Installation procedureSrie arospatiale - crous sertir, auto-freinants, flancsde retenue - Procdure dinstallationLuft- und Raumfahrt - Einnietmuttern, selbstsichernd, mitAnlageflche - EinbauverfahrenThis European Standard was approved by CEN on 12 December 2007.CEN memb
6、ers are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application
7、 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 translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the s
8、ame status as theofficial 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, Portugal,Rom
9、ania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2008 CEN All rights of exploitation in any form and by any means reservedwo
10、rldwide for CEN national Members.Ref. No. EN 3148:2008: E2 Contents Page Foreword3 1 Scope 4 2 Normative references 4 3 Swaging procedure4 4 Swaging tool dimensions .5 5 Controlling alter swaging7 BS EN 3148:20083 Foreword This document (EN 3148:2008) has been prepared by the Aerospace and Defence I
11、ndustries 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 ASD, prior to its presentati
12、on 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 October 2008, and conflicting national standards shall be withdrawn at the latest by October 2008. Attention is drawn to the possibility
13、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 countries are bound
14、 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, Spain, Sweden, Swi
15、tzerland and the United Kingdom. BS EN 3148:20084 1 Scope This process standard details the installation of shank nuts to EN 2910 and EN 2911 in engine components. It applies to flange restrained shank nuts and shall be observed whenever invoked in drawings and working documents. It is to ensure pro
16、per installation for adequate retention of the shank nuts and freedom from damage to the components involved. 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
17、, the latest edition of the referenced document (including any amendments) applies. EN 2910, Aerospace series Shank nuts, self-locking, in heat resisting steel FE-PA92HT (A286) Classification: 1 100 MPa (at ambient temperature) / 650 C. EN 2911, Aerospace series Shank nuts, self-locking, in heat res
18、isting steel FE-PA92HT (A286), silver plated Classification: 1 100 MPa (at ambient temperature) / 650 C. 3 Swaging procedure Swaging of shank nuts is carried out by deforming the end of the shank using a 60 swaging cone. Shank nuts are swaged with the aid of a swaging tool either manually or by mach
19、ine. Swaging cones and anvils of the swaging tools are replaceable. Before swaging, make sure you are using the proper combination of cone, anvil and shank nut (see Table 1 in Clause 4) to prevent excessive load on the components. To prevent damage to the locking element of the shank nut the tool sh
20、all not be located on the end of the nut locking element, but on the flange of the shank nut. The component flange shall be firmly held against the nut before swaging commences because the angle of the cone will not automatically ensure tightness. Care shall be taken not to damage the components dur
21、ing assembly. Figure 1 shows a swaged shank nut. BS EN 3148:20085 Key 1 Nut shank must be underflush after swaging 2 Swaging of shanks may result in “rub off“ or coating damage in these areas. This is permissible. 3 Component flange 4 Flange for locating swaging tool 5 Shank nut end with locking ele
22、ment 6 Shank nut 7 Shank Figure 1 Swaged shank nut 4 Swaging tool dimensions The dimensions of the swaging cone and the anvil to be used for swaging of the relevant shank nut sizes are shown in Figure 2 and Table 1. All other tool dimensions depend on the means of production of each user of the shan
23、k nuts. BS EN 3148:20086 Key 1 Swaging cone 2 Anvil Figure 2 Tool dimensions Table 1 Dimensions Dimensions in millimetres A B C Diameter code Shank nut thread size + 0,2 0 Ref. + 0,2 0 050 MJ50,8-4H6H 3,8 7,5 8,7 060 MJ61-4H5H 8,5 9,7 070 MJ71-4H5H 4,8 9,5 10,7 080 MJ81-4H5H 5,4 11,0 11,7 BS EN 3148
24、:20087 5 Controlling alter swaging After swaging the following conditions shall be accomplished: The shank shall be underflush after swaging to avoid fouling the mating flange (see Figure 1). Manual rotation of the shank nut up to the trap shall be permissible but there shall be no axial movement. T
25、he swaged shank shall show no cracks or corrugations. The bearing surface of the shank nut shall bear completely on the base. In case of silver coated shank nuts to EN 2911: During swaging the tool may damage the silver coating inside the shank. Also, due to this operation the coating on the end fac
26、e of the swaged shank may break up or flake. All such damage is permissible and it is not necessary to “touch up“ the coating. Any loose flakes of silver coating shall be removed. BS EN 3148:2008BS EN 3148:2008BSI389 Chiswick High RoadLondonW4 4ALBSI British Standards InstitutionBSI is the independe
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