1、BRITISH STANDARD AEROSPACE SERIES BS A344:1999 ISO3191:1998 Nuts, anchor, self-locking, fixed, single lug, reduced series, with counterbore, with MJthreads, classifications: 1100MPa (at ambient temperature)/235C, 1100MPa (at ambient temperature)/315C, 1100MPa (at ambient temperature)/425C Dimensions
2、 ICS 49.030.30BSA 344:1999 This British Standard, having been prepared under the directionof the Engineering SectorCommittee, was publishedunder the authority ofthe Standards Committee andcomesinto effect on 15 March1999 BSI 05-1999 ISBN 0 580 32216 5 National foreword This British Standard reproduc
3、es verbatim ISO3191:1998 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 r
4、esponsibility 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.
5、 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 “In
6、ternational 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
7、 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, pagesii toiv, pages1 and2 and a back cover. This standard has been updated (see copyright date) and may hav
8、e had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBSA344:1999 BSI 05-1999 i Contents Page National foreword Inside front cover Foreword iii Text of ISO3191 1ii blankBSA 344:1999 ii BSI 05-
9、1999 Contents Page Foreword iii Introduction 1 1 Scope 1 2 Normative references 1 3 Configuration and dimensions 1 Figure 1 2 Table 1 2BSA344:1999 BSI 05-1999 iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodi
10、es). 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. International organizations, governmental and
11、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 committees are circulated to the member bodi
12、es for voting. Publication as an International Standard requires approval by at least75% of the member bodies casting a vote. International Standard ISO3191 was prepared by Technical Committee ISO/TC20, Aircraft and space vehicles, Subcommittee SC4, Aerospace fastener systems. This second edition ca
13、ncels and replaces the first edition (ISO3191:1985), which has been technically revised. Descriptors: Aircraft industry, fasteners, MJ threads, nuts (fasteners), anchor nuts, self-locking nuts, single-lug nuts, counterbore nuts, classification, form specifications, dimensions.iv blankBSA344:1999 BSI
14、 05-1999 1 Introduction The dimensions specified in this International Standard have been determined to satisfy the requirements of the procurement specification of ISO5858. 1 Scope This International Standard specifies the dimensions of self-locking, fixed, single lug anchor nuts, reduced series, w
15、ith counterbore, with MJ threads, for classifications:1100 MPa 1) /235C 2) , 1100MPa 1) /315C 2)and 1100 MPa 1) /425C 2) . This International Standard is only applicable for the compilation of aerospace product standards. 2 Normative references The following standards contain provisions which, throu
16、gh reference in this text, constitute provisions of this International Standard. 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 apply
17、ing the most recent editions of the standards indicated below. Members of 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 tempe
18、rature less than or equal to425C Procurement specification. ISO8788:1987, 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
19、the application of any lubricant. The metallic cap (optional) shall remain joined (type of attachment at the users discretion) to the nut at the maximum operating temperature. See test conditions specified in ISO5858. 1) Corresponds to the minimum tensile stress which the nut is able to withstand at
20、 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 temperature is condit
21、ioned by the surface treatment.BSA 344:1999 2 BSI 05-1999 Table 1 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 before any surface coating(s) is (are) applied. The va
22、lues do not apply to threads, punched holes or shear edges the surface texture of which will be as achieved by the usual manufacturing methods. 2) Tooling marks permissible in this area Figure 1 Diameter code Thread a C D E F G H J b K L M N P c Q R S max. max. min. min. max. max. max. max. max. max
23、. max. +0,2 0 040 MJ4 0,74H6H 6,6 6 5,5 4,4 2,2 6,2 8 18,2 5,8 1,1 11 13 2,5 050 MJ5 0,84H6H 0,4 8,1 7 5,5 2,4 7,3 9 19,7 6,9 11,4 13,4 2,5 060 MJ6 14H5H 9,2 8 6,5 2,7 8,7 10 21,7 8,1 1,4 12,7 14,7 3 a In accordance with ISO5855-2. In the self-locking zone, the tolerances apply before forming out-of
24、-round. b Measured at sharp corners (chamfered) or point of tangency (radiused). c Maximum protrusion of the bolt.blankBS A344:1999 ISO3191:1998 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It
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