1、BRITISH STANDARDBS EN 3905:2008Aerospace series Six lobe recesses for bolts Technical specificationICS 49.030.20g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g5
2、5g3g47g36g58BS EN 3905:2008This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 May 2008 BSI 2008ISBN 978 0 580 60980 0National forewordThis British Standard is the UK implementation of EN 3905:2008.The UK participation in its preparation was e
3、ntrusted 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 responsible for its c
4、orrect application.Compliance with a British Standard cannot confer immunity from legal obligations. Amendments/corrigenda issued since publicationDate CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 3905April 2008ICS 49.030.20English VersionAerospace series - Six lobe recesses for bolts -
5、 TechnicalspecificationSrie arospatiale - Empreinte six lobes pour vis -Spcification techniqueLuft- und Raumfahrt - Sechs-Bogenzahn-Innenantrieb frSchrauben - Technische LieferbedingungenThis European Standard was approved by CEN on 29 February 2008.CEN members are bound to comply with the CEN/CENEL
6、EC 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 to the CEN Management Centre or to any CE
7、N 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 same status as theofficial versions.CEN mem
8、bers 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,Romania, Slovakia, Slovenia, Spain, Sweden, S
9、witzerland 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 reservedworldwide for CEN national Members.Ref. No.
10、EN 3905:2008: E2 Contents Page Foreword3 1 Scope 4 2 Normative references 4 3 Qualification .4 4 Requirements.4 5 Apparatus .4 5.1 Test block .4 5.2 Nut .4 BS EN 3905:20083 Foreword This document (EN 3905:2008) has been prepared by the Aerospace and Defence Industries Association of Europe - Standar
11、dization (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 presentation to CEN. This European Standard shall b
12、e 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 that some of the elements of this documen
13、t 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 to implement this European Standard: Aus
14、tria, 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, Switzerland and the United Kingdom. BS EN 39
15、05:20084 1 Scope This standard specifies the characteristics and qualification requirements for six lobe recesses defined by EN 3911 for bolts. The requirements of this specification are additional to the requirements of the relevant bolt technical specification. 2 Normative references The following
16、 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 3911, Aerospace series Six lobe recess Geometrical definiti
17、on. 1)ISO 5855-2, Aerospace MJ threads Part 2: Limit dimensions for bolts and nuts. 3 Qualification See Table 1. 4 Requirements See Table 1. 5 Apparatus See Figure 1. 5.1 Test block Material: steel HRC 40 5.2 Nut thread to ISO 5855-2; tensile strength class: no requirement; material: no requirement.
18、 1) Published as ASD Prestandard at the date of publication of this standard. BS EN 3905:20085 Table 1 Technical requirements and test methods Characteristic Requirement Inspection and test method Sample size Wrench feature test at ambient temperature The wrench torque specified in Table 2 shall be
19、applied to all bolts with internal drive recesses in accordance with EN 3911 (six lobe recess). Number of cycles: 15. The driving recess shall not display any permanent damage. The bolt head shall have two flats machined in it, to give a clearance of between 0,05 mm and 0,1 mm from the test block (s
20、ee Figure 1). Lubricate both the bolt and nut threads with clean engine oil. Insert bolt (with flats) into test block. Torque tighten nut and bolt assembly in the test block in accordance with Table 2. The test block shall then be suitably held (e.g. bench vice). Apply the torque load with a driver
21、according to EN aerospace series using a suitably calibrated torque wrench (taking care not to apply any bending moment to the recess), alternating clockwise and counterclockwise (one cycle). 5 Table 2 Wrench torque values Nominal diameter mm Wrench torque a Nm Recess code 5 13,8 27 6 24 30 7 40 40
22、8 60 45 10 115 50 aBased on two and half times the torque required to induce 75 % of the 0,2 % proof stress in a bolt of class 900 MPa (R0,2 %= 590 MPa) BS EN 3905:20086 Key 1 2 pitch min. 2 Slot depth = Bolt head height 1 mm 3 Chamfer according to the bolt head radius 4 Bolt diameter (0,100,25+) mm
23、 5 Slot width = Bolt head diameter 1 mm D: Nominal diameter of the bolt Figure 1 Test block BS EN 3905:2008blankBS EN 3905:2008BSI389 Chiswick High RoadLondonW4 4ALBSI British Standards InstitutionBSI is the independent national body responsible for preparing British Standards. It presents the UK vi
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