1、BS ISO12257:2008ICS 49.030.20NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDAerospace Internalsix-lobe drives Metric seriesThis British Standardwas published under theauthority of the StandardsPolicy and StrategyCommittee on 31 August2008 BSI 2008ISBN 978 0 580
2、 63500 7Amendments/corrigenda issued since publicationDate CommentsBS ISO 12257:2008National forewordThis British Standard is the UK implementation of ISO 12257:2008.The UK participation in its preparation was entrusted to TechnicalCommittee ACE/12, Aerospace fasteners and fastening systems.A list o
3、f organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunityfrom legal oblig
4、ations.BS ISO 12257:2008Reference numberISO 12257:2008(E)ISO 2008INTERNATIONAL STANDARD ISO12257First edition2008-08-01Aerospace Internal six-lobe drives Metric series Aronautique et espace Empreintes six lobes Srie mtrique BS ISO 12257:2008ISO 12257:2008(E) PDF disclaimer This PDF file may contain
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7、ers were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO 2008 All right
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9、requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2008 All rights reservedBS ISO 12257:2008ISO 12257:2008(E) ISO 2008 All rights reserved iiiForeword ISO (the Internat
10、ional Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has bee
11、n established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical stand
12、ardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for
13、 voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all
14、 such patent rights. ISO 12257 was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee SC 4, Aerospace fastener systems. BS ISO 12257:2008BS ISO 12257:2008INTERNATIONAL STANDARD ISO 12257:2008(E) ISO 2008 All rights reserved 1Aerospace Internal six-lobe drives Metric
15、 series 1 Scope This International Standard specifies the dimensions of metric internal six-lobe drives used in metric screws in nominal thread diameter range 3 mm to 20 mm. NOTE Pending publication of an International Standard relating to limit gauges, special care is required to ensure that the di
16、mensions and tolerances specified in this International Standard are confirmed by alternative means. 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, the lat
17、est edition of the referenced document (including any amendments) applies. ISO 1101, Geometrical Product Specifications (GPS) Geometrical tolerancing Tolerances of form, orientation, location and run-out 3 Configuration and dimensions See Figure 1 and Table 1. Dimensions and tolerances are expressed
18、 in millimetres. The presentation of this International Standard conforms to ISO 1101. 4 Designation The drive designation shall be as follows: BS ISO 12257:2008ISO 12257:2008(E) 2 ISO 2008 All rights reservedKey 1 chamfer (optional) aShape optional. Figure 1 Table 1 Dimensions in millimetres Drive
19、code B H P R1R2Y 06 1,27 1,75 0,16 0,36 07 1,5 2,07 0,18 0,42 08 1,75 2,4 0,22 0,49 09 1,85 2,6 0,23 0,53 10 2,05 2,8 0,25 0,57 15 2,4 3,35 0,3 0,69 20 2,85 3,95 0,33 0,83 0,025 25 3,25 4,5 0,4 0,89 27 3,65 5,1 0,42 1,08 30 4,05 5,6 0,48 1,16 0,035 40 4,85 6,75 0,58 1,4 45 5,64 7,93 0,61 1,76 50 6,4
20、5 8,95 0,81 1,78 0,05 55 8,05 11,35 0,96 2,62 60 9,6 13,45 According to bolthead, see product standard 1,12 2,83 0,06 BS ISO 12257:2008This page has been intentionally left blank BS ISO12257:2008BSI GroupHeadquarters 389Chiswick High Road,London, W4 4AL, UKTel +44 (0)20 8996 9001Fax +44 (0)20 8996
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