1、BRITISH STANDARD AEROSPACE SERIES BS A 334:1999 ISO 3221:1998 Nuts, anchor, self-locking, fixed,90 corner, with counterbore, with MJthreads, classifications: 1100MPa (at ambient temperature)/235 C, 1100MPa (at ambient temperature)/315 C and1100MPa (atambient temperature)/425 C Dimensions ICS 49.030.
2、30BSA 334:1999 This British Standard, having been prepared under the directionof the Engineering SectorCommittee, was publishedunder the authority ofthe Standards Committee andcomes into effect on 15 February1999 BSI 05-1999 ISBN 0 580 32168 1 National foreword This British Standard reproduces verba
3、tim ISO3221:1998 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 responsib
4、ility 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 UKinterests informed; monitor related international and European developments and promulgate them in the UK. A list o
5、f 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 “Internation
6、al 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 Britis
7、h 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, pages1 to3 and a back cover. This standard has been updated (see copyright date) and may have had amendment
8、s incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBSA334:1999 BSI 05-1999 i Contents Page National foreword Inside front cover Foreword ii Introduction 1 1 Scope 1 2 Normative references 1 3 Configuratio
9、n and dimensions 1 Figure 1 2 Table 1 3ii blankBSA334:1999 ii BSI 05-1999 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 through ISO te
10、chnical 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 collaborates close
11、ly 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 circulated to
12、 the member bodies for voting. Publication as an International Standard requires approval by at least75% of the member bodies casting a vote. International Standard ISO3221 was prepared by Technical Committee ISO/TC20, Aircraft and space vehicles, Subcommittee SC4, Aerospace fastener systems. This s
13、econd edition cancels and replaces the first edition (ISO3221:1989), which has been technically revised. Descriptors: Aircraft industry, fasteners, MJ threads, nuts (fasteners), anchor nuts, self-locking nuts, counterbore nuts, classification, form specifications, dimensions.BSA334:1999 BSI 05-1999
14、1 Introduction The dimensions specified in this International Standard have been determined 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, fixed, 90 corner ancho
15、r nuts, with counterbore, with MJ threads, of classifications:1100MPa 1) /235C 2) , 1100MPa 1) /315 C 2)and1100MPa 1) /425 C 2) . This International Standard is only applicable for the compilation of aerospace product standards. 2 Normative references The following normative documents contain provis
16、ions 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 Standard are encouraged to investigate
17、 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 International Standards. ISO5855-2:1988, Aerospace
18、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. 3 Configuration and dimensions See Fig
19、ure 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 of attachment at the users discretion)
20、. SeeISO5858 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 able to withstand, without permanent al
21、teration to its original characteristics, after ambient temperature has been restored. The maximum temperature is conditioned by the surface treatment.BSA334:1999 2 BSI 05-1999 Tolerances of form and position shall conform to those specified in ISO8788. Details of form not stated are at the manufact
22、urers discretion. a These values, in micrometres, apply before any surface coating(s) is (are) applied. The values do not apply to threads, punched holes or shear edges the surface texture of which will be as achieved by the usual manufacturing methods. b Tooling marks permissible in this area Figur
23、e 1 BSA334:1999 BSI 05-1999 3 Table 1 Diameter code Thread a C max. D max. E F G min. H min. j b max. K max. L max. M max. N max. p c max. Q max. R S V 0,25 030 MJ3 0,5-4H6H 6 8,5 4,6 3 11,7 3,2 1 2,5 2,5 4,8 040 MJ4 0,7-4H6H 0,4 6,6 8,5 12 4,4 2,2 6,2 4 15,7 5,8 11 13 3 050 MJ5 0,8-4H6H 8,1 9,5 13,
24、4 5,5 2,4 7,3 4,5 17,2 6,9 11,4 13,4 060 MJ6 1-4H5H 9,2 11 15,6 6,5 2,7 8,7 5 19,7 8,1 1,2 12,7 14,7 3,5 080 MJ8 1-4H5H 0,5 12,8 8,5 10,9 6,5 21,2 9,9 1,5 15 18 3 5,7 100 MJ10 1,25-4H5H 15 13 18,4 10,5 3 12,9 8,1 25,8 12 1,6 20,2 22 4,5 3,5 6,6 a In accordance with ISO5855-2. In the self-locking zon
25、e, the tolerances apply before forming out-of-round. b Measured at sharp corners (chamfered) or point of tangency (radiused) c Maximum protrusion of the boltBS A334:1999 ISO3221:1998 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsi
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