1、BRITISH STANDARD AEROSPACE SERIES BS A 323:1998 ISO 4095:1998 Aerospace Bihexagonal drives Wrenching configuration Metric series ICS 49.030.01BSA323:1998 This British Standard, having been prepared under the direction of the Engineering Sector Board, was published under the authority of the Standard
2、s Board and comes into effect on 15 May 1998 BSI 04-1999 ISBN 0 580 29912 0 National foreword This British Standard reproduces verbatim ISO4095:1998 and implements it as the UK national standard. The UK participation in its preparation was entrusted by Technical CommitteeACE/12, Aerospace fasteners
3、and fastening systems, to SubcommitteeACE/12/1, Aerospace fasteners and fastening systems (international), which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change,
4、and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or Eur
5、opean publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the nec
6、essary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theI
7、SO title page, page ii, pages 1 and 2 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBSA323:1998 BSI 04-
8、1999 i Contents Page National foreword Inside front cover Foreword ii 1 Scope 1 2 Normative reference 1 3 Configuration and dimensions 1 4 Designation 1 Figure1 1 Table1 2ii blankBSA323:1998 ii BSI 04-1999 Foreword ISO (the International Organization for Standardization) is a worldwide federation of
9、 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 been established has the right to be represented on that committee. Int
10、ernational 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 standardization. Draft International Standards adopted by the technical c
11、ommittees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75% of the member bodies casting a vote. International Standard ISO 4095 was prepared by Technical Committee ISO/TC20, Aircraft and space vehicles, Subcommittee SC 4, Aero
12、space fastener systems. This second edition cancels and replaces the first edition (ISO4095:1978), of which it constitutes a technical revision. Descriptors: Aircraft industry, fasteners, form specifications, dimensions, geometric characteristics, designation, metric system.BSA323:1998 BSI 04-1999 1
13、 1 Scope This International Standard specifies the metric wrenching configuration dimensions of bihexagonal drives. This is a design standard. 2 Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this International Standard.
14、 At the time of publication, the edition indicated was valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below. Members of IEC and IS
15、O maintain registers of currently valid International Standards. ISO 286-2:1988, ISO system of limits and fits Part2: Tables of standard tolerance grades and limit deviations for holes and shafts. 3 Configuration and dimensions SeeFigure 1 andTable 1. Dimensions and tolerances are expressed in milli
16、metres. Variations in size, form and position of the bihexagon are permitted within the wrenching length, provided that the actual profile falls within the maximum and minimum material conditions shown in Figure 1. Dimensions are prior to forming the locking element on self-locking nuts. 4 Designati
17、on The drive designation shall be as follows: Figure 1 BSA323:1998 2 BSI 04-1999 Table 1 Wrenching dash number Maximum material condition Minimum material condition A max. a B max. b C max. c A min. d B min. b C min. e 05 06 07 08 5,77 6,93 8,08 9,24 5 6 7 8 5,22 6,26 7,30 8,34 5,54 6,67 7,77 8,91 4
18、,88 5,88 6,85 7,85 5,05 6,09 7,09 8,13 09 10 12 10,39 11,55 13,86 9 10 12 9,39 10,43 12,52 10,04 11,18 13,42 8,85 9,85 11,82 9,16 10,20 12,24 14 17 19 16,17 19,63 21,94 14 17 19 14,60 17,73 19,82 15,65 19,07 21,28 13,73 16,73 18,67 14,21 17,32 19,33 22 24 27 25,40 27,71 31,18 22 24 27 22,95 25,03 28
19、,16 24,70 26,98 30,40 21,67 23,67 26,67 22,43 24,50 27,61 30 32 36 34,64 36,95 41,57 30 32 36 31,29 33,38 37,55 33,82 36,04 40,60 29,67 31,61 35,61 30,72 32,73 36,87 a A max. = 1,154 7 B max. b Width across flats dimension, tolerance: h12 (see ISO 286-2) for B 12. c C max. = 1,043 B max. d A min. =
20、1,135B min. for wrenching dash number12 e C min. = 1,035 276 B min.3 blankBS A 323:1998 ISO 4095:1998 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europ
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