1、ASD STANDARD NORME ASD ASD NORM prEN 3911 Edition P 2 June 2009 PUBLISHED BY THE AEROSPACE AND DEFENCE INDUSTRIES ASSOCIATION OF EUROPE - STANDARDIZATIONAvenue de Tervuren, 270 - B-1150 Brussels - Tel. + 32 2 775 8126 - Fax. + 32 2 775 8131 - www.asd-stan.orgICS: Supersedes edition P 1 of August 199
2、3 Descriptors: ENGLISH VERSION Aerospace series Six lobe recess Geometrical definition Srie arospatiale Empreinte six lobes Dfinition gometrique Luft- und Raumfahrt Verbindungselemente, Innenantrieb Sechs-Bogenzahn This “Aerospace Series“ Prestandard has been drawn up under the responsibility of ASD
3、-STAN (The AeroSpace and Defence Industries Association of Europe - Standardization). It is published for the needs of the European Aerospace Industry. It has been technically approved by the experts of the concerned Domain following member comments. Subsequent to the publication of this Prestandard
4、, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. After examination and review by users and formal agreement of ASD-STAN, it will be submitted as a draft European Standard (prEN) to CE
5、N (European Committee for Standardization) for formal vote and transformation to full European Standard (EN). The CEN national members have then to implement the EN at national level by giving the EN the status of a national standard and by withdrawing any national standards conflicting with the EN.
6、 Edition approved for publication 10 June 2009 Comments should be sent within six months after the date of publication to ASD-STAN Mechanical Domain Copyright 2009 by ASD-STAN prEN 3911:20092 Contents Page Foreword2 1 Scope 3 2 Normative references 3 3 Required characteristics.3 3.1 Configuration Di
7、mensions - Tolerances 3 4 Designation 4 5 Technical specification .4 Foreword This standard was reviewed by the Domain Technical Coordinator of ASD-STANs Mechanical Domain. After inquiries and votes carried out in accordance with the rules of ASD-STAN defined in ASD-STANs General Process Manual, thi
8、s standard has received approval for Publication. prEN 3911:2009 3 1 Scope This standard specifies the dimensions and tolerances of six lobe recess. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the editio
9、n cited applies. For 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 chara
10、cteristics 3.1 Configuration 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, Gaithers
11、burg, MD 20878, United States. prEN 3911:20094 Table 1 Recess code E F RaRbY 06 1,27 1,75 0,16 0,36 07 a 1,5 2,07 0,18 0,42 08 1,73 2,4 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 0,3 0,69 20 a2,83 3,94 0,33 0,83 0,025 25 3,24 4,52 0,4 0,89 27 3,63 5,08 0,42 1,08 30 a4,03 5
12、,61 0,48 1,16 0,035 40 a4,84 6,76 0,58 1,4 45 5,64 7,92 0,61 1,76 50 a6,45 8,94 0,81 1,78 0,050 55 a8,03 11,34 0,96 2,62 60 a9,61 13,42 1,12 2,83 0,060 aThese dimensions are derivated from NAS 1800. 4 Designation EXAMPLE Description block RECESS Identity block EN3911-40 Number of this standard Recess code (see Table 1) 5 Technical specification EN 3905
