1、BRITISH STANDARD AEROSPACE SERIES BS A338:1999 ISO3225:1998 Nuts, anchor, self-locking, fixed, twolug, reduced series, with counterbore, with MJ threads, classifications: 1100MPa (at ambient temperature)/235C, 1100 MPa (at ambient temperature)/315 C and1100 MPa (atambient temperature)/425C Dimension
2、s ICS49.030.30BSA338:1999 This British Standard, having been prepared under the directionof the Engineering SectorCommittee, was publishedunder the authority ofthe Standards Committee andcomes into effect on 15February1999 BSI 05-1999 ISBN 0 580 32172 X National foreword This British Standard reprod
3、uces verbatim ISO3225:1998 and implements it as the UK national standard. The UK participation in its preparation was entrusted by Technical Committee ACE/12, Aerospace fasteners and fastening systems, to Subcommittee ACE/12/1, Aerospace fasteners and fastening systems (International), which has the
4、 responsibility 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 U
5、K. 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 European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “
6、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 necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance wi
7、th 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, theISO title page, page ii, pages 1 and 2 and a backcover. This standard has been updated (see copyright date) and may have
8、had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBSA338:1999 BSI 05-1999 i Contents Page National foreword Inside front cover Foreword ii Introduction 1 1 Scope 1 2 Normative references 1 3
9、 Configuration and dimensions 1 Figure 1 2 Table 1 2ii blankBSA338:1999 ii BSI05-1999 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 th
10、rough 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. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collab
11、orates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part3. Draft International Standards adopted by the technical committees are c
12、irculated to the member bodies for voting. Publication as an International Standard requires approval by at least75% of the member bodies casting a vote. International Standard ISO3225 was prepared by Technical Committee ISO/TC20, Aircraft and space vehicles, Subcommittee SC4, Aerospace fastener sys
13、tems. This second edition cancels and replaces the first edition (ISO3225:1985), which has been technically revised. Descriptors: Aircraft industry, fasteners, MJ threads, nuts (fasteners), anchor nuts, self-locking nuts, two lug nuts, counterbore nuts, classification, form specifications, dimension
14、s.BSA338:1999 BSI 05-1999 1 Introduction The dimensions specified in this International Standard have been determined to allow production of a part that will satisfy the requirements of the procurement specification ISO5858. 1 Scope This International Standard specifies the dimensions of self-lockin
15、g, fixed, two lug anchor nuts, reduced series, with counterbore, with MJthreads, of classifications: 1100MPa 1) /235 C 2) ,1100MPa 1) /315 C 2)and1100MPa 1) /425 C 1) . This International Standard is only applicable for the compilation of aerospace product standards. 2 Normative references The follo
16、wing normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International
17、 Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid Internationa
18、l 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 to425 C Procurement specification. ISO8788:1987, Aerospace Fasteners Tolerances of form and position for nuts.
19、 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. The metallic cap (optional) shall remain joined to the nut at the maximum operating temperature (type
20、 of attachment at the users discretion). See ISO5858 for the test conditions. 1) Corresponds to the minimum tensile 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
21、 able to withstand, without permanent alteration to its original characteristics, after ambient temperature has been restored. The maximum temperature is conditioned by the surface treatment.BSA338:1999 2 BSI 05-1999 Table 1 Figure 1 Diameter code Thread a C max. D max. E F G min. H min. J bmax. K m
22、ax. L max. M max. N max. P c max. Q max. R . 040 MJ4 0,7-4H6H 6,6 6 12 4,4 2,2 6,2 8 17,2 5,8 1,1 11 13 2,5 050 MJ50,8-4H6H 0,4 8,1 7 14 5,5 2,4 6,3 9 19,2 6,9 11,4 13,4 060 MJ6 1-4H5H 9,2 8 16 6,5 2,7 8,7 10 22,2 8,1 1,35 12,7 14,7 3 a In accordance with ISO5855-2. In the self-locking zone, the tol
23、erances apply before forming out-of-round. b Measured at sharp corners (chamfered) or point of tangency (radiused) c Maximum protrusion of the boltblankBS A338:1999 ISO3225:1998 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible f
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