1、BRITISH STANDARD BS ISO 8279:2008 Aerospace Nuts, hexagonal, plain, normal height, normal across flats, with MJ threads, classifications: 600 MPa (at ambient temperature)/120 C, 600 MPa (at ambient temperature)/235 C, 900 MPa (at ambient temperature)/ 425 C, 1 100 MPa (at ambient temperature)/235 C,
2、 1 100 MPa (at ambient temperature)/315 C, 1 100 MPa (at ambient temperature)/650 C, 1 210 MPa (at ambient temperature)/730 C, 1 250 MPa (at ambient temperature)/235 C and 1 550 MPa (at ambient temperature)/600 C Dimensions ICS 49.030.30 BS ISO 8279:2008 This British Standard was published under the
3、 authority of the Standards Policy and Strategy Committee on 30 September 2008 BSI 2008 ISBN 978 0 580 55022 5 National foreword This British Standard is the UK implementation of ISO 8279:2008. It supersedes BS A317:1997 which is withdrawn. The UK participation in its preparation was entrusted to Te
4、chnical Committee ACE/12, Aerospace fasteners and fastening systems. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct appli
5、cation. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments/corrigenda issued since publication Date Comments Reference number ISO 8279:2008(E)INTERNATIONAL STANDARD ISO 8279 Third edition 2008-08-01 Aerospace Nuts, hexagonal, plain, normal height, normal acr
6、oss flats, with MJ threads, classifications: 600 MPa (at ambient temperature)/120 C, 600 MPa (at ambient temperature)/235 C, 900 MPa (at ambient temperature)/425 C, 1 100 MPa (at ambient temperature)/235 C, 1 100 MPa (at ambient temperature)/315 C, 1 100 MPa (at ambient temperature)/650 C, 1 210 MPa
7、 (at ambient temperature)/730 C, 1 250 MPa (at ambient temperature)/235 C and 1 550 MPa (at ambient temperature)/600 C Dimensions Aronautique et espace crous hexagonaux ordinaires, hauteur normale, surplats normaux, filetages MJ, classifications: 600 MPa ( temprature ambiante)/120 C, 600 MPa ( tempr
8、ature ambiante)/235 C, 900 MPa ( temprature ambiante)/425 C, 1 100 MPa ( temprature ambiante)/235 C, 1 100 MPa ( temprature ambiante)/315 C, 1 100 MPa ( temprature ambiante)/650 C, 1 210 MPa ( temprature ambiante)/730 C, 1 250 MPa ( temprature ambiante)/235 C et 1 550 MPa ( temprature ambiante)/600
9、C Dimensions BS ISO 8279:2008 ii 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
10、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 part in the work. ISO collaborates closely with the International Electrotech
11、nical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by t
12、he technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent right
13、s. ISO shall not be held responsible for identifying any or all such patent rights. ISO 8279 was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee SC 4, Aerospace fastener systems. This third edition cancels and replaces the second edition (ISO 8279:1997), which ha
14、s been technically revised. BS ISO 8279:2008iv Introduction The dimensions specified in this International Standard have been determined to satisfy the requirements of the procurement specification ISO 9139. BS ISO 8279:20081Aerospace Nuts, hexagonal, plain, normal height, normal across flats, with
15、MJ threads, classifications: 600 MPa (at ambient temperature)/120 C, 600 MPa (at ambient temperature)/235 C, 900 MPa (at ambient temperature)/425 C, 1 100 MPa (at ambient temperature)/235 C, 1 100 MPa (at ambient temperature)/315 C, 1 100 MPa (at ambient temperature)/650 C, 1 210 MPa (at ambient tem
16、perature)/730 C, 1 250 MPa (at ambient temperature)/235 C and 1 550 MPa (at ambient temperature)/600 C Dimensions 1 Scope This International Standard specifies the dimensions of plain, hexagonal nuts, of normal height, normal across flats, with MJ threads, of classifications: 600 MPa 1) /120 C 2) ,
17、600 MPa 1) /235 C 2) , 900 MPa 1) /425 C 2) , 1 100 MPa 1) /235 C 2) , 1 100 MPa 1) /315 C 2) , 1 100 MPa 1) /650 C 2) , 1 210 MPa 1) /730 C 2) , 1 250 MPa 1) /235 C 2) and 1 550 MPa 1) /600 C 2) . Nuts provided with holes are intended to be used with lockwire in conformity with ISO 245. This Intern
18、ational Standard is only applicable for the compilation of aerospace product standards. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition o
19、f the referenced document (including any amendments) applies. ISO 245, Aerospace Lockwire Diameters ISO 5855-2, Aerospace MJ threads Part 2: Limit dimensions for bolts and nuts ISO 8788, Aerospace Nuts, metric Tolerances of form and position 1) Corresponds to the minimum tensile stress that the nut
20、is able 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 maxi
21、mum temperature is conditioned by the material or by the surface treatment. BS ISO 8279:20082 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. Dimensi
22、ons in millimetres Tolerances of form and position shall conform to those specified in ISO 8788. Details of form not stated are left to the manufacturers discretion. Key 1 two holes diameter U, optional 2 thread aThese values, in micrometres, apply before any surface coating(s) is(are) applied. The
23、values do not apply to threads whose surface texture will be as achieved by the usual manufacturing methods. bAll forms of entry (chamfer or radius) permissible within these limiting dimensions. cForm of contour, within limiting dimensions, is left to the manufacturers discretion. Diameter M may be
24、tangential to, but shall not intrude on, the flats. dTo both faces. eFrom one face. Figure 1 BS ISO 8279:20083 Table 1 L M U E F H N V W Dia- meter code Thread anom. tol. min. H13 min. nom. tol. h14 nom. tol. 0,2 min. Lockwire diameter b 020 MJ2 0,4-4H6H 2,2 3,4 4,2 4 1,6 025 MJ2,5 0,45-4H6H2,7 4,4
25、5,3 5 2 030 MJ3 0,5-4H6H 3,2 5,4 6,5 6 2,4 0,4 0 2 040 MJ4 0,7-4H6H 4,2 6,4 7,6 7 3,2 050 MJ5 0,8-4H6H 5,2 0,6 0 +7,4 8,7 8 h12 4 060 MJ6 1-4H5H 6,3 9,3 10,910 4,8 3,9 2 070 MJ7 1-4H5H 7,3 10,2 12 11 5,6 4,4 2,4 080 MJ8 1-4H5H 8,3 12,2 1 14,313 6,4 0,5 5 2,8 0,8 100 MJ10 1,25-4H5H 10,3 16 18,917 8 6
26、,9 3,6 120 MJ12 1,25-4H5H 12,3 18 21,119 9,6 8 4,4 140 MJ14 1,5-4H5H 14,4 21 24,522 11,2 9,6 5,1 160 MJ16 1,5-4H5H 16,4 23 26,824 12,8 10,7 5,9 180 MJ18 1,5-4H5H 18,4 26 30,227 14,4 12 6,7 200 MJ20 1,5-4H5H 20,4 29 33,630 16 13,4 7,5 220 MJ22 1,5-4H5H 22,4 30,9 35,832 17,6 14,4 8,3 240 MJ24 2-4H5H 2
27、4,5 0,8 0 +34,9 1,5 40,4 36 h13 19,2 0,6 0 3 16,1 9,1 1,25 aIn accordance with ISO 5855-2. bFor information, in conformity with ISO 245. BS ISO 8279:20084 Bibliography 1 ISO 9139, Aerospace Nuts, plain or slotted (castellated) Procurement specification 2 ISO 13715, Technical drawings Edges of undefi
28、ned shape Vocabulary and indications BS ISO 8279:2008 blankBS ISO 8279:2008 BSI Group Headquarters 389 Chiswick High Road, London W4 4AL, UK Tel +44 (0)20 8996 9001 Fax +44 (0)20 8996 7001 British Standards Institution (BSI) BSI is the independent national body responsible for preparing British Sta
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