1、BRITISH STANDARD AEROSPACE SERIES BS A 322:1998 ISO 3202:1997 Aerospace Screws, pan head, internal offset cruciform ribbed or unribbed drive, threaded to head, metallic material, coated or uncoated, strength classes less than or equal to1100MPa Dimensions ICS 49.030.20BS A 322:1998 This British Stan
2、dard, having been prepared under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes intoeffect on 15January1998 BSI 04-1999 ISBN 0 580 29435 8 National foreword This British Standard reproduces verbatim ISO3202:1997 and implements it as
3、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 responsibility to: aid enquirers to understand
4、the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals 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 su
5、bcommittee 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 “International Standards Correspondence Index”, or
6、 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 a British Standard does not of itself confer i
7、mmunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theISO title page, page ii, 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 indica
8、ted in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBS A 322:1998 BSI 04-1999 i Contents Page National foreword Inside front cover Foreword ii 1 Scope 1 2 Normative references 1 3 Configuration and dimensions 1 Figure 1 1 Table 1 2ii blankB
9、S A322:1998 ii BSI 04-1999 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 interested
10、 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 Electrotechnical Comm
11、ission (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 Standard requires approval by at least 75% of the member bodies casting a vote. Internati
12、onal Standard ISO3202 was prepared by Technical Committee ISO/TC20, Aircraft and space vehicles, Subcommittee SC4, Aerospace fastener systems. This second edition cancels and replaces the first edition (ISO3202:1991), of which it constitutes a technical revision. Descriptors: Aircraft industry, fast
13、eners, threaded fasteners, MJ threads, screws, pan head screws, cross recessed screws, offset-cross recessed screws, form specifications, dimensions, dimensional tolerances.BS A322:1998 BSI 04-1999 1 1 Scope This International Standard specifies the dimensions of threaded to head pan head screws, wi
14、th internal offset cruciform ribbed or unribbed drive, MJ threads, in metallic material, coated or uncoated, with strength classes less than or equal to 1 100MPa. This International Standard is applicable for the compilation of aerospace product standards. 2 Normative references The following standa
15、rds 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 to revision, and parties to agreements based on this International Standard are encouraged to i
16、nvestigate 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. ISO 3353:1992, Aerospace Rolled threads for bolts Lead and runout requirements. ISO 5855-2:1988, Aerospace MJ thread
17、s Part 2: Limit dimensions for bolts and nuts. ISO 7913:1994, Aerospace Bolts and screws, metric Tolerances of form and position. ISO 14275: 1) , Aerospace Drives, internal, offset cruciform, ribbed Metric series. ISO 14276: 1) , Aerospace Drives, internal, offset cruciform Metric series. 3 Configur
18、ation and dimensions SeeFigure 1 and Table 1. Dimensions and tolerances are expressed in millimetres. They are applicable after any surface coating, but before the application of any lubricant. Tolerances of form and position are specified in ISO7913. 1) To be published. Figure 1 BSA322:1998 2 BSI 0
19、4-1999 Table 1 Diameter code Thread a D 1 D 2 D 3 K L b R T Drive code c min. nom. tol. nom. tol. 0,3 nom. tol. max. min. 016 MJ1,60,354h6h 1,9 3,2 1,1 1 4 to 22 0,7 0,2 R1,6 020 MJ20,44h6h 2,7 4 1,4 1,2 4 to 28 0,3 0,8 R2 025 MJ20,454h6h 3,7 5 1,9 1,5 4 to 36 1,0 0,3 R2,5 030 MJ30,54h6h 4,7 6 2,3 1
20、,8 4 to 42 1,2 R3 035 MJ3,50,64h6h 5,7 7 2,7 2,1 6 to 50 0,4 1,4 0,4 R3,5 040 MJ40,74h6h 6,7 8 3 2,4 6 to 56 1,6 R4 050 MJ50,84h6h 8,7 10 3,4 3 8 to 70 0,5 2,0 0,5 R5 060 MJ614h6h 10,7 12 4,2 3,6 10 to 84 2,4 0,6 R6 070 MJ714h6h 12,7 14 5,2 0,5 4,2 10 to 98 0,7 2,8 0,7 080 MJ814h6h 14,7 16 6,2 4,8 1
21、0 to 112 3,2 0,8 R8 100 MJ101,254h6h 18,7 20 7,9 6 14 to 140 0,8 4 1 R10 120 MJ121,254h6h 22,7 24 9,8 7,2 16 to 168 0,9 4,8 1,2 R12 a In accordance with ISO5855-2 b Increments: 2 for L 100 If greater lengths are required, they shall be chosen using these increments. c In accordance with ISO14276 for
22、 codes R1,6 to R2,5. In accordance with ISO14275 or ISO14276 for codes R3. 0 0,3 0 0,5 0 0,2 0 0,2 0 0,3 0 0,3 blankBS A 322:1998 ISO 3202:1997 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It
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