1、BRITISH STANDARD AEROSPACE SERIES BSA345:1999 ISO8538:1999 Nuts, hexagonal, self-locking, with counterbore and captive washer, with MJ threads, classifications: 1100MPa (at ambient temperature)/235 C, 1100MPa (at ambient temperature)/315 C, 1100MPa (at ambient temperature)/425C Dimensions ICS49.030.
2、30BSA345:1999 This BritishStandard, having been prepared under the directionof the Engineering SectorCommittee, was publishedunder the authorityofthe Standards Committee andcomes into effecton 15April1999 BSI03-2000 ISBN 0 580 32377 3 National foreword This BritishStandard reproduces verbatim ISO853
3、8:1999 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 responsibility to:
4、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 list of organiz
5、ations 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 “International Standar
6、ds 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 British Standard
7、 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 toiv, pages1 and2 and a back cover. This standard has been updated (see copyright date) and may have had amendments inco
8、rporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBSA345:1999 BSI 03-2000 i Contents Page National foreword Inside front cover Foreword iii Text of ISO8538 1ii blankBSA 345:1999 ii BSI 03-2000 Contents Page Fo
9、reword iii Introduction 1 1 Scope 1 2 Normative references 1 3 Configuration and dimensions 1 Figure 1 2 Table 1 2 Descriptors: Aircraft industry, fasteners, MJ threads, nuts (fasteners), hexagonal nuts, counterbore nuts, self-locking nuts, classification, form specifications, dimensions.BSA 345:199
10、9 BSI 03-2000 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 committees. Each member body interested in a sub
11、ject 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 International Electrotechnical Commission (I
12、EC) 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 the member bodies for voting. Publication as an Interna
13、tional Standard requires approval by at least75% of the member bodies casting a vote. International Standard ISO8538 was prepared by Technical Committee ISO/TC20, Aircraft and space vehicles, Subcommittee SC4, Aerospace fastener systems. This second edition cancels and replaces the first edition (IS
14、O8538:1986), which has been technically revised.iv blankBSA 345:1999 BSI 03-2000 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 Intern
15、ational Standard specifies the dimensions of self-locking hexagonal nuts, with counterbore and captive washer, with MJ threads, of classifications:1100MPa 1) /235 C 2) , 1100MPa 1) /315 C 2) ,1100MPa 1) /425 C 2) . This International Standard is only applicable for the compilation of aerospace produ
16、ct standards. 2 Normative references The following 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, par
17、ties to agreements based on this International 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 main
18、tain 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, Aerospace Fasten
19、ers Tolerances of form and position for nuts. 3 Configuration and dimensions See Figure 1 and Table 1. Dimensions and tolerances are in millimetres. They apply after any surface coating(s) but before the application of any lubricant. 1) Corresponds to the minimum tensile stress which the nut is able
20、 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 restored. The maximum tempe
21、rature is conditioned by the material or by the surface treatment.BSA 345:1999 2 BSI 03-2000 Table 1 Figure 1 Diameter code Thread a E F G H J K L M N P min. nom. tol. max. max. min. min. max. min. min. min. 030 MJ3 0,54H6H 4,2 4 h12 6,7 4,6 3,4 5,2 3,8 0,4 1,2 1,6 040 MJ4 0,74H6H 5,3 5 8,4 6,2 4,4
22、6,4 4,8 1,5 2,2 050 MJ5 0,84H6H 6,5 6 9,6 7,4 5,5 7,6 5,8 0,6 2 2,4 060 MJ6 14H5H 7,6 7 11,1 8,1 6,5 9 6,8 2,3 2,7 070 MJ7 14H5H 8,7 8 13,3 9 7,5 11 8 2,7 080 MJ8 14H5H 10,9 10 h13 14,6 9,9 8,5 12 9 3,2 100 MJ10 1,254H5H 13,2 12 17,2 12 10,5 14,7 11 3,8 3 120 MJ12 1,254H5H 15,5 14 21 13,8 12,5 18,5
23、13 4,5 a In accordance with ISO5855-2. In the self-locking zone, the tolerances apply before forming out-of-round.blankBSA345:1999 ISO8538:1999 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It
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