1、BRITISH STANDARD AEROSPACE SERIES BS A 324:1998 ISO 9199:1998 Aerospace Nuts, bihexagonal, self-locking, MJ threads, classifications: 1 100 MPa (at ambient temperature)/425 C, 1 100 MPa (at ambient temperature)/650 C 1 210 MPa (at ambient temperature)/425 C 1 210 MPa (at ambient temperature)/730 C 1
2、 550 MPa (at ambient temperature)/235 C 1 550 MPa (at ambient temperature)/425 C and 1 550 MPa (at ambient temperature)/600 C Dimensions ICS 49.030.30BSA324:1998 This British Standard, having been prepared under the direction of the Engineering Sector Board, was published under the authority of the
3、Standards Board and comes into effect on 15 June 1998 BSI 05-1999 ISBN 0 580 29911 2 National foreword This British Standard reproduces verbatim ISO9199:1998 and implements it as the UK national standard. The UK participation in its preparation was entrusted by Technical Committee ACE/12, Aerospace
4、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 interpretation, or proposals f
5、or 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 Standards which implement internati
6、onal 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 does not purport to include
7、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 inside front cover, pages i a
8、nd ii, theISOtitle page, pageii, pages 1 and 2 andaback 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 publication Amd. No. Date CommentsBSA324:1998
9、BSI 05-1999 i Contents Page National foreword Inside front cover Foreword ii Introduction 1 1 Scope 1 2 Normative references 1 3 Configuration and dimensions 1 Figure 1 2 Table 1 2ii blankBSA324:1998 ii BSI 05-1999 Foreword ISO (the International Organization for Standardization) is a worldwide fede
10、ration 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 subject for which a technical committee has been established has the right to be represented on that commi
11、ttee. International organizations, governmental and 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 te
12、chnical committees are circulated 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 ISO 9199 was prepared by Technical Committee ISO/TC20, Aircraft and space vehicles, Subcommittee SC
13、 4, Aerospace fastener systems. This second edition cancels and replaces the first edition (ISO9199:1987), of which it constitutes a technical revision. Descriptors: Aircraft industry, fasteners, MJ threads, nuts (fasteners), double hexagonal nuts, self-locking nuts, classification dimensions.BSA324
14、:1998 BSI 05-1999 1 Introduction The dimensions specified in this International Standard have been determined to satisfy the requirements of the procurement specification of ISO 5858 or ISO 8641, depending on the classification of the nut. 1 Scope This International Standard specifies the dimensions
15、 of bihexagonal nuts with counterbore and MJ threads and a self-locking feature achieved by forming the upper portion out-of-round, for classifications:1100MPa 1) /425C 2) , 1100MPa 1) /650C 2) ,1210MPa 1) /425C 2) , 1210MPa 1) /730C 2) ,1550MPa 1) /235C 2) , 1550MPa 1) /425C 2)and1550MPa 1) /600C 2
16、) . 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 International Standard. At the time of publication, the editio
17、ns 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. Members of IEC and ISO maintain registers of currently v
18、alid International Standards. ISO 4095:1998, Aerospace Bi-hexagonal drives Wrenching configuration Metric series. ISO 5855-2:1988, Aerospace MJ threads Part2: Limit dimensions for bolts and nuts. ISO 5858:1991, Aerospace Self-locking nuts with maximum operating temperature less than or equal to425C
19、Procurement specification. ISO 8641:1987, Aerospace Self-locking nuts with maximum operating temperature greater than425C Procurement specification. ISO 8788:1987, Aerospace Fasteners Tolerances of form and position for nuts. 3 Configuration and dimensions See Figure 1 and Table 1. Dimensions and to
20、lerances are expressed 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 to withstand at ambient temperature without breaking or cracking when tested with a bolt of a higher strength
21、 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 material or by the surface treatment.BSA324:1998 2 BSI 05-1999 Table 1 NOTETolera
22、nces of form and position shall be in conformity with those specified in ISO 8788. Details of form not stated are at the manufacturers discretion. 1) These values, in micrometres, apply before any surface coating(s) is (are) applied. The values do not apply to threads the surface texture of which wi
23、ll be as achieved by the usual manufacturing methods. 2) All forms of entry (radius or chamfer) permissible within these limiting dimensions. Figure 1 Diameter code Thread a G H K M N Q S Wrenching dash number b max. max. min. min. min. max. min. max. 040 MJ40,7-4H6H 7,4 5,6 6,7 1,8 4,8 4,2 4,2 06 0
24、50 MJ50,8-4H6H 9,1 7 8,3 2 5,8 5,2 4,9 07 060 MJ614H5H 10,6 8,1 9,8 1,2 2,3 7,1 6,3 5,5 08 070 MJ71-4H5H 12,1 9,1 11,3 2,6 8,1 7,3 6,1 09 080 MJ81-4H5H 13,6 10,4 12,8 2,8 9,1 8,3 6,7 10 100 MJ101,25-4H5H 16,8 13 15,8 3,1 11,1 10,3 8,1 12 120 MJ121,25-4H5H 19,9 15 18,8 1,4 3,5 13,1 12,3 9,5 14 140 MJ
25、141,5-4H5H 23 17,5 21,9 1,7 4 15,2 14,4 10,7 17 160 MJ161,5-4H5H 26 20 24,9 1,9 4,7 17,2 16,4 12,3 19 180 MJ181,5-4H5H 29,1 22,5 28 2,1 5,6 19,2 18,4 13,7 22 200 MJ201,5-4H5H 32,3 25 31,2 2,3 6,8 21,2 20,4 15,8 24 220 MJ221,5-4H5H 35,4 27,5 34,3 2,5 8,3 23,2 22,4 17,6 27 240 MJ242-4H5H 38 30 36,9 2,
26、7 10,1 25,3 24,5 19,4 30 a In accordance with ISO 5855-2. In the self-locking zone, the tolerances apply before forming out-of-round. b In accordance with ISO 4095 over N min.3 blankBS A 324:1998 ISO 9199:1998 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the indepen
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