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1、BRITISH STANDARD AEROSPACE SERIES BS A 344:1999 ISO 3191:1998 Nuts, anchor, self-locking, fixed, single lug, reduced series, with counterbore, with MJ threads, classifications: 1 100 MPa (at ambient temperature)/235 C, 1 100 MPa (at ambient temperature)/315 C, 1 100 MPa (at ambient temperature)/425
2、C Dimensions ICS 49.030.30 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:36:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS A 344:1999 This British Standard, having been prepared under the direction of the Engineering Sector Committee, was published under
3、the authority of the Standards Committee and comes into effect on 15 March 1999 BSI 05-1999 ISBN 0 580 32216 5 National foreword This British Standard reproduces verbatim ISO 3191:1998 and implements it as the UK national standard. The UK participation in its preparation was entrusted by Technical C
4、ommittee ACE/12, Aerospace fasteners and fastening systems, to Subcommittee ACE/12/1, Aerospace fasteners and fastening systems (international), which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the int
5、erpretation, 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 organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standard
6、s which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard d
7、oes 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 does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an in
8、side front cover, pages i and ii, the ISO title page, pages ii to iv, pages 1 and 2 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publica
9、tion Amd. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:36:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS A 344:1999 BSI 05-1999i Contents Page National forewordInside front cover Forewordiii Text of ISO 31911 Licensed Copy: London South B
10、ank University, London South Bank University, Sat Dec 09 03:36:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:36:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Licensed Copy: London South Bank University,
11、 London South Bank University, Sat Dec 09 03:36:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS A 344:1999 ii BSI 05-1999 Contents Page Forewordiii Introduction1 1Scope1 2Normative references1 3Configuration and dimensions1 Figure 12 Table 12 Licensed Copy: London South Bank University, London Sout
12、h Bank University, Sat Dec 09 03:36:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS A 344:1999 BSI 05-1999iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards i
13、s 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 non-governmental, in liaison with ISO, also take par
14、t 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 bodies for voting. Publication as an International Stand
15、ard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 3191 was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee SC 4, Aerospace fastener systems. This second edition cancels and replaces the first edition (ISO 3191:
16、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. Licensed Copy: London South Bank University, London South Bank Unive
17、rsity, Sat Dec 09 03:36:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:36:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS A 344:1999 BSI 05-19991 Introduction The dimensions specified in this Internatio
18、nal Standard have been determined to satisfy the requirements of the procurement specification of ISO 5858. 1 Scope This International Standard specifies the dimensions of self-locking, fixed, single lug anchor nuts, reduced series, with counterbore, with MJ threads, for classifications: 1 100 MPa 1
19、)/235 C 2), 1 100 MPa 1)/315 C 2) and 1 100 MPa 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 Inter
20、national 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 applying the most recent editions of the standards indicated below.
21、 Members of IEC and ISO maintain registers of currently valid International Standards. ISO 5855-2:1988, Aerospace MJ threads Part 2: Limit dimensions for bolts and nuts. ISO 5858:1991, Aerospace Self-locking nuts with maximum operating temperature less than or equal to 425 C Procurement specificatio
22、n. ISO 8788:1987, 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 the application of any lubricant. The metallic cap (opti
23、onal) shall remain joined (type of attachment at the users discretion) to the nut at the maximum operating temperature. See test conditions specified in ISO 5858. 1) Corresponds to the minimum tensile stress which the nut is able to withstand at ambient temperature without breaking or cracking when
24、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 conditioned by the surface treatment. Licensed Copy: London S
25、outh Bank University, London South Bank University, Sat Dec 09 03:36:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS A 344:1999 2 BSI 05-1999 Table 1 NOTETolerances of form and position shall conform to those specified in ISO 8788. Details of form not stated are at the manufacturers option. 1) Thes
26、e 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. 2) Tooling marks permissible in this area Figure 1 Diameter code Threa
27、daCDEFGHJbKLMNPcQRS max. max.min.min.max. max.max.max.max.max.max. +0,2 0 040MJ4 0,7 4H6H 6,66 5,5 4,42,26,2818,2 5,8 1,1 1113 2,5 050MJ5 0,8 4H6H0,48,175,52,47,3919,7 6,911,4 13,42,5 060MJ6 1 4H5H9,286,52,78,71021,7 8,11,412,7 14,7 3 a In accordance with ISO 5855-2. In the self-locking zone, the to
28、lerances apply before forming out-of-round. b Measured at sharp corners (chamfered) or point of tangency (radiused). c Maximum protrusion of the bolt. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:36:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI blank Licen
29、sed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:36:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS A 344:1999 ISO 3191:1998 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing B
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