1、BRITISH STANDARD AEROSPACE SERIES BS A319:1997 ISO12268: 1997 Aerospace Nuts,hexagonal,plain, reduced height, reduced across flats, with MJ threads, classifications: 450MPa(atambient temperature)/425 C, 600MPa(at ambient temperature)/235 C, 600MPa(at ambient temperature)/315 C, 600MPa(at ambient tem
2、perature)/650 C, 900MPa(at ambient temperature)/235 C, 900MPa(at ambient temperature)/730 C, and1100MPa (at ambient temperature)/600 C, Dimensions ICS 49.030.30BSA319:1997 This British Standard, having been prepared under the directionof the Engineering SectorBoard, was published underthe authority
3、of theStandards Board andcomes intoeffect on 15October1997 BSI 09-1999 ISBN 0 580 28730 0 National foreword This British Standard reproduces verbatim ISO12268:1997 and implements itas the UK national standard. The UK participation in its preparation was entrusted by Technical Committee ACE/12, Aeros
4、pace 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 propos
5、als for change, and keep the UKinterests 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 inter
6、national 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 incl
7、ude 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
8、i andii, theISO title page, pages ii to iv, pages1 and2 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 publication Amd. No. Date CommentsB
9、SA319:1997 BSI 09-1999 i Contents Page National foreword Inside front cover Foreword iii Text of ISO 12268 1ii blankBS A319:1997 ii BSI 09-1999 Contents Page Foreword iii Introduction 1 1 Scope 1 2 Normative references 1 3 Configuration and dimensions 1 Figure 1 2 Table 1 2 Descriptors: Aircraft ind
10、ustry, fasteners, MJ threads, nuts (fasteners), hexagonal nuts, classification, form specifications, dimensions.BS A319:1997 BSI 09-1999 iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of prepa
11、ring 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 non-governmental, in l
12、iaison 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 bodies for voting. Publica
13、tion as an International Standard requires approval by at least75% of the member bodies casting a vote. International Standard ISO12268 was prepared by Technical Committee ISO/TC20, Aircraft and space vehicles, Subcommittee SC4, Aerospace fastener systems.iv blankBSA319:1997 BSI 09-1999 1 Introducti
14、on The dimensions specified in this International Standard have been determined to satisfy the requirements of the procurement specification of ISO9139. 1 Scope This International Standard specifies the dimensions of plain, hexagonal nuts, reduced height, reduced across flats, with MJ threads, of cl
15、assifications:450MPa 1) /425C 2) , 600MPa 1) /235C 2) , 600MPa 1) /315C 2) , 600MPa 1) /650C 2) , 900MPa 1) /235C 2) , 900MPa 1) /730C 2)and1100MPa 1) /600C 2) . Nuts provided with holes are intended to be used with lockwire in conformity with ISO245. This International Standard is only applicable f
16、or 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 editions indicated were valid. All standards are subject t
17、o 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 valid International Standards. ISO245:1986, Aircraft
18、Lockwire. ISO5855-2:1988, Aerospace MJ threads Part2:Limit dimensions for bolts and nuts. ISO8788:1987, Aerospace Fasteners Tolerances of form and position for nuts. ISO9139:, Aerospace Nuts, plain or slotted (castellated) Procurement specification 3) . 3 Configuration and dimensions SeeFigure 1 and
19、 Table 1. Dimensions and tolerances 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
20、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 material or by the surface treatment. 3) To be publish
21、ed.BSA 319:1997 2 BSI 09-1999 Table 1 NOTETolerances of form and position shall conform to those specified in ISO8788. 1) These values, in micrometers, apply before any surface coating(s) is (are) applied. The values do not apply to threads the surface texture of which will be as achieved by the usu
22、al manufacturing methods. 2) All forms of entry (chamfer or radius) permissible within these limiting dimensions. 3) Form of contour, within limiting dimensions, is left to the manufacturers discretion. Diameter M may be tangential to, but shall not intrude on the flats. 4) Applicable to both faces.
23、 5) From either face. Figure 1 Diameter code Thread a E F H L M N U V W Lockwire diameter b min. h13 h14 min. H13 0,2 min. 100 MJ10.1,254H5H 15,5 14 5 10,3 13,2 1 5,9 2,1 0,8 120 MJ12.1,254H5H 18,9 17 6 12,3 16 7,2 2,6 140 MJ14.1,54H5H 21,1 19 7 14,4 18 8,2 3,1 160 MJ16.1,54H5H 24,5 22 8 16,4 21 0,6
24、 9,7 3,6 180 MJ18.1,54H5H 26,8 24 9 18,4 23 1,5 10,8 4,1 1,25 200 MJ20.1,54H5H 30,2 27 10 20,4 26 12,5 4,6 220 MJ22.1,54H5H 33,6 30 11 22,4 29 13,9 5 240 MJ24.24H5H 35,8 32 12 24,5 30,9 14,9 5,5 a In accordance with ISO5855-2 b For information, in conformity with ISO245 +08 , 0 0 03 ,blankBS A319:19
25、97 ISO12268: 1997 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions Bri
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