1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 3911:2010Aerospace series Sixlobe recess GeometricaldefinitionBS EN 3911:2010 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 3911:201
2、0.The UK participation in its preparation was entrusted to TechnicalCommittee ACE/12, Aerospace fasteners and fastening systems.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of
3、 a contract. Users are responsible for its correctapplication. BSI 2010ISBN 978 0 580 70745 2ICS 49.030.01Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 Novemb
4、er 2010.Amendments issued since publicationDate Text affectedBS EN 3911:2010EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 3911 October 2010 ICS 49.030.01 English Version Aerospace series - Six lobe recess - Geometrical definition Srie arospatiale - Empreinte six lobes - Dfinition gometrique L
5、uft- und Raumfahrt - Sechs-Bogenzahn, Innenantrieb - Definition der Geometrie This European Standard was approved by CEN on 16 April 2010. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a nation
6、al standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A versi
7、on in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Cz
8、ech 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 United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EU
9、ROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 3911:2010: EBS EN 3911:2010EN 3911:2010 (E) 2 Contents Page Foreword 31
10、 Scope 42 Normative references 43 Required characteristics .43.1 Configuration Dimensions Tolerances 44 Designation 55 Technical specification .5BS EN 3911:2010EN 3911:2010 (E) 3 Foreword This document (EN 3911:2010) has been prepared by the Aerospace and Defence Industries Association of Europe - S
11、tandardization (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 s
12、hall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by April 2011, and conflicting national standards shall be withdrawn at the latest by April 2011. Attention is drawn to the possibility that some of the elements of this docum
13、ent 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: A
14、ustria, Belgium, Bulgaria, Croatia, 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 Kingdo
15、m. BS EN 3911:2010EN 3911:2010 (E) 4 1 Scope This European Standard specifies the dimensions and tolerances of a six lobe recess. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. Fo
16、r undated references, the latest edition of the referenced document (including any amendments) applies. EN 3905, Aerospace series Six lobe recesses for bolts Technical specification NAS 1800:1990, Recess, six lobe drive Internal Dimensions for recess and gages 1)3 Required characteristics 3.1 Config
17、uration Dimensions Tolerances Configuration shall be in accordance with Figure 1. Dimensions and tolerances shall conform with Figure 1 and Table 1 and are expressed in millimetres. Figure 1 1) Published by: National Standards Association, Inc., 1200 Quince Orchad Blvd, Gaithersburg, MD 20878, Unite
18、d States. BS EN 3911:2010EN 3911:2010 (E) 5 Table 1 Recess code E F RaRbY 06 1,27 1,75 0,16 0,36 0,025 07 a 1,50 2,07 0,18 0,42 08 1,73 2,40 0,22 0,49 09 1,86 2,58 0,23 0,53 10 a2,03 2,82 0,25 0,57 15 2,41 3,35 0,30 0,69 20 a2,83 3,94 0,33 0,83 25 3,24 4,52 0,40 0,89 0,035 27 3,63 5,08 0,42 1,08 30
19、a4,03 5,61 0,48 1,16 40 a4,84 6,76 0,58 1,40 0,050 45 5,64 7,92 0,61 1,76 50 a6,45 8,94 0,81 1,78 55 a8,03 11,34 0,96 2,62 0,060 60 a9,61 13,42 1,12 2,83 aThese dimensions are derived from NAS 1800. 4 Designation EXAMPLE Description blockRECESS Identity block EN3911-40 Number of this standard Recess
20、 code (see Table 1) 5 Technical specification EN 3905 This page deliberately left blankThis page deliberately left blankBSI is the independent national body responsible for preparing British Standardsand other standards-related publications, information and services. It presents the UK view on stand
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