1、BRITISH STANDARD AEROSPACE SERIES BS A 340:1999 ISO 9156:1998 Nuts, anchor, self-locking, fixed, 90 corner, reduced series, with counterbore, with MJ threads, classifications: 1100MPa (at ambient temperature)/235C, 1100MPa (at ambient temperature)/315C and1100MPa (at ambient temperature)/425C Dimens
2、ions ICS 49.030.30BSA340:1999 This British Standard, having been prepared under the directionof the Engineering SectorCommittee, was publishedunder the authority ofthe Standards Committee andcomes into effect on 15February1999 BSI 05-1999 ISBN 0 580 32179 7 National foreword This British Standard re
3、produces verbatim ISO9156:1998 and implements it as 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
4、 the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in t
5、he UK. A list of organizations represented on this subcommittee 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 entitl
6、ed “International Standards Correspondence Index”, or 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. Complianc
7、e 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 and ii, theISO title page, page ii, pages1 and2 and a back cover. This standard has been updated (see copyright date) and may ha
8、ve had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBSA340:1999 BSI 05-1999 i Contents Page National foreword Inside front cover Foreword ii Introduction 1 1 Scope 1 2 Normative references
9、1 3 Configuration and dimensions 1 Figure 1 2 Table 1 2ii blankBSA340:1999 ii BSI05-1999 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
10、 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 part in the work. ISO col
11、laborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part3. Draft International Standards adopted by the technical committees ar
12、e 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 ISO9156 was prepared by Technical Committee ISO/TC20, Aircraft and space vehicles, Subcommittee SC4, Aerospace fastener
13、systems. This second edition cancels and replaces the first edition (ISO9156:1989), which has been technically revised. Descriptors: Aircraft industry, fasteners, MJ threads, nuts (fasteners), anchor nuts, self-locking nuts, counterbore nuts, classification, form specifications, dimensions.BSA340:19
14、99 BSI 05-1999 1 Introduction The dimensions specified in this International Standard have been determined to allow production of a part which will satisfy the requirements of the procurement specification ISO5858. 1 Scope This International Standard specifies the dimensions of self-locking, fixed,9
15、0 corner anchor nuts, reduced series, with counterbore, with MJthreads, of classifications: 1100MPa 1) /235C 2) ,1100MPa 1) /315 C 2)and1100MPa 1) /425C 2) . This International Standard is only applicable for the compilation of aerospace product standards. 2 Normative references The following normat
16、ive documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard a
17、re encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards
18、. 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 Procurement specification. ISO 8788:1987, Aerospace Fasteners Tolerances of form and position for nuts. 3 Config
19、uration 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 (optional) shall remain joined to the nut at the maximum operating temperature (type of attac
20、hment at the users discretion). SeeISO5858 for the test conditions. 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 class. 2) Maximum temperature that the nut is able to w
21、ithstand, without permanent alteration to its original characteristics, after ambient temperature has been restored. The maximum temperature is conditioned by the surface treatment.BSA340:1999 2 BSI 05-1999 Table 1 Figure 1 Diameter code Thread a C max. D max. E F G min. H min. J bmax. K max. L max.
22、 M max. N max. P cmax. Q max. R . 040 MJ4 0,7-4H6H 0,4 6,6 6 8,5 4,4 2,2 6,2 4 12,7 5,8 1 11 13 2,5 050 MJ5 0,8-4H6H 8,1 7 9,9 5,5 2,4 7,3 4,5 14,2 6,9 11,4 13,4 060 MJ6 1-4H5H 9,2 8 11,3 6,5 2,7 8,7 5 16,2 8,1 1,2 12,7 14,7 3 a In accordance with ISO5855-2. In the self-locking zone, the tolerances
23、apply before forming out-of-round. b Measured at sharp corners (chamfered) or point of tangency (radiused) c Maximum protrusion of the boltblankBS A 340:1999 ISO9156:1998 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for prep
24、aring BritishStandards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions BritishStandards are updated by amendment or revision. Users of BritishStandards should make sure that they possess the latest amendments or editions.
25、 It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this BritishStandard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside f
26、ront cover. Tel:02089969000. Fax:02089967400. BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards. Buying standards Orders for all BSI, international and foreign standards publications should be addressed
27、 to Customer Services. Tel:02089969001. Fax:02089967001. In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as BritishStandards, unless otherwise requested. Information on standards BSI provides a wide range of infor
28、mation on national, European and international standards through its Library and its Technical Help to Exporters Service. Various BSI electronic information services are also available which give details on all its products and services. Contact the Information Centre. Tel:02089967111. Fax:020899670
29、48. Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards. For details of these and other benefits contact Membership Administration. Tel:02089967002. Fax:02089967001. Copyright Copyright subsists in all BSI pu
30、blications. BSI also holds the copyright, in the UK, of the publications of the international standardization bodies. Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means electronic
31、, photocopying, recording or otherwise without prior written permission from BSI. This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols, and size, type or grade designations. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. If permission is granted, the terms may include royalty payments or a licensing agreement. Details and advice can be obtained from the Copyright Manager. Tel:02089967070.
