1、BRITISH STANDARD AEROSPACE SERIES BS A330:1999 ISO12272: 1998 Nuts, anchor, self-locking, floating, two lug, with incremental counterbore, with MJ threads, classifications: 900MPa (at ambient temperature)/235 C, 900MPa (at ambient temperature)/315 C and900MPa (atambient temperature)/425C Dimensions
2、ICS 49.030.30BSA330:1999 This BritishStandard, having been prepared under the directionof the Engineering SectorCommittee, was publishedunder the authorityofthe Standards Committee and comes into effect on 15April1999 BSI02-2000 ISBN 0 580 30330 6 National foreword This BritishStandard reproduces ve
3、rbatim ISO12272:1998 and implements it as the UK national standard. The UK participation in its preparation was entrusted by Technical Committee ACE/12, Aerospace fasteners and fastener systems, to Subcommittee ACE/12/1, Aerospace fasteners and fastener systems (international), which has the respons
4、ibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A lis
5、t of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The BritishStandards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “Internati
6、onal 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 necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a Brit
7、ish Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, theISO title page, pagesii to iv, pages1 to 3 and a back cover. This standard has been updated (see copyright date) and may have had am
8、endments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBSA330:1999 BSI 02-2000 i Contents Page National foreword Inside front cover Foreword iii Text of ISO12272 1ii blankBS A 330:1999 ii BSI 02-2000 C
9、ontents Page Foreword iii Introduction 1 1 Scope 1 2 Normative references 1 3 Configuration and dimensions 1 Figure 1 2 Table 1 3 Descriptors: Aircraft industry, fasteners, MJ threads, nuts (fasteners) anchor nuts, self-locking nuts, two lug nuts, floating nuts, counterbore nuts, classification, for
10、m specifications, dimensions.BS A 330:1999 BSI 02-2000 iii Foreword ISO (the International 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 committ
11、ees. Each member body interested in a subject for which a technical committee has been 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 Int
12、ernational Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least75% of the member b
13、odies casting a vote. International Standard ISO12272 was prepared by Technical Committee ISO/TC20, Aircraft and space vehicles, Subcommittee SC4, Aerospace fastener systems.iv blankBS A 330:1999 BSI 02-2000 1 Introduction The dimensions specified in this International Standard have been determined
14、to allow production of a part which will satisfy the requirements of the procurement specification ISO5858. 1 Scope This International Standard specifies the dimensions of self-locking, floating, two lug anchor nuts, with incremental counterbore, with MJ threads, for classifications: 900MPa 1) /235
15、C 2) ,900MPa 1) /315 C 2) and900MPa 1) /425 C 2) . This International Standard is only applicable for the compilation of aerospace product standards. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International S
16、tandard. At the time of publication, the editions indicated were 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 editions of the standards indicated below. Members o
17、f IEC and ISO maintain registers of currently valid International Standards. ISO5855-2:1988, Aerospace MJ threads Part2: Limit dimensions for bolts and nuts. ISO5858:1991, Aerospace Self-locking nuts with maximum operating temperature less than or equal to425C Procurement specification. ISO8788:1987
18、, Aerospace Fasteners Tolerances of form and position for nuts. 3 Configuration and dimensions See Figure 1 and Table 1. Dimensions and tolerances are expressed in millimetres. They apply after any surface coating(s) but before the application of any lubricant. 1) Corresponds to the minimum tensile
19、stress which the nut is able to withstand at ambient temperature without breaking or cracking when tested with a bolt of a higher strength class. 2) Maximum temperature that the nut is able to withstand, without permanent alteration to its original characteristics, after ambient temperature has been
20、 restored. The maximum temperature is conditioned by the material or by the surface treatment.BS A 330:1999 2 BSI 02-2000 NOTETolerances of form and position shall conform to those specified in ISO8788. Details of form not stated are at the manufacturers option. 1)These values, in micrometres, apply
21、 before any surface coating(s) is(are) applied. The values do not apply to threads, punched holes or sheared edges, the surface texture of which will be as achieved by the usual manufacturing methods. 2)Tooling marks permissible in this area. Figure 1 BS A 330:1999 BSI 02-2000 3 Table 1 Diameter cod
22、e Thread a E F G H J bK L M N P R S T Radial floating min. min. max. max. max. max. max. min. max. Z min. 050 MJ5 0,84H6H 9,5 19 5,2 4 7,3 12 25,2 8,5 0,9 6,5 3 2,5 4,5 0,5 6 10,5 8 12,5 10 14,5 060 MJ6 14H5H 11 22 6,2 4 8,7 13,5 29,2 9,4 0,9 7,5 3,5 2,5 4,6 0,5 6 11,4 8 13,4 10 15,4 080 MJ8 14H5H 1
23、1 22 8,2 4 10,9 16 29,2 11,2 1,1 9,5 3,5 3 5,5 0,5 6 13,2 8 15,2 10 17,2 a In accordance with ISO5855-2. In the self-locking zone, the tolerances apply before forming out-of-round. b Measured at sharp corners (chamfered) or point of tangency (radiused). + 0,2 0BS A330:1999 ISO12272: 1998 BSI 389 Chi
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