1、BRITISH STANDARD BS SP 18 & 19:1949 Incorporating Amendment Nos. 1 and 2 Specification for Washers for aircraft purposes (primarily for use with timber)BSSP18&19:1949 This British Standard, having been approved by the Aircraft Industry Standards Committee and endorsed by the Chairman ofthe Engineeri
2、ng Divisional Council, was published under theauthority of the General Council of the Institution on 10February1949 BSI 05-2000 ISBN 0 580 34440 1 A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct a
3、pplication. 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 and ii, page 1 and a back cover. This standard has been updated (see copyright date) and may have had amend
4、ments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date of issue Comments 2575 September 1956 4141 April 1984 Indicated by a sideline in the marginBSSP18&19:1949 BSI 05-2000 i Contents Page 1 Scope 1 2 Material 1
5、3 Dimensions 1 4 Finish 1 5 Identification 1 Table 1 Material 1 Table 2 Dimensions 1ii blankBSSP18&19:1949 BSI 05-2000 1 1 Scope These British Standards apply to the materials, dimensions and finish of washers generally used with timber in aircraft. The washers are primarily for use with B.A.and B.S
6、.F.bolts. 2 Material The washers shall be manufactured from the appropriate material specified inTable 1. 3 Dimensions The washers shall conform to the dimensions specified inTable 2. 4 Finish The washers shall be flat within a tolerance of0.005in.with parallel faces, and free from burrs. All washer
7、s manufactured from cold rolled mild steel, complying with BS S510 1) , shall be cadmium plated in accordance with Ministry of Supply Process Specification D.T.D.904. 1) 5 Identification The washers shall be identified for ordering purposes by the number of the British Standard together with the app
8、ropriate code letter shown inTable 2, e.g.cold rolled, mild steel washer for 7 / 16 in.bolt is SP.18L. Table 1 Material Table 2 Dimensions 1) Latest issue. BS Material BS SP 18 Cold rolled mild steel, complying with BS S510 a , cadmium plated. BS SP 19 Stainless steel, complying with BS S526 aor BS
9、S527 a . a Latest issue. To suit bolts Code letter Diameter A Diameter B Thickness a C max. min. max. min. 6 B.A. A in. 0.123 in. 0.118 in. 1.01 in. 0.99 in. 0.064 (16 S.W.G.) mm 1.6 4 B.A. B 0.157 0.152 1.01 0.99 0.064 (16 S.W.G.) 1.6 2 B.A. C 0.202 0.197 1.26 1.24 0.064 (16 S.W.G.) 1.6 1 / 4 in.B.
10、S.F. E 0.270 0.265 1.26 1.24 0.064 (16 S.W.G.) 1.6 5 / 16in.B.S.F. G 0.333 0.328 1.26 1.24 0.064 (16 S.W.G.) 1.6 3 / 8 in.B.S.F. J 0.395 0.390 1.51 1.49 0.080 (14 S.W.G.) 2.0 7 / 16in.B.S.F. L 0.458 0.453 1.51 1.49 0.080 (14 S.W.G.) 2.0 1 / 2 in.B.S.F. N 0.520 0.515 1.51 1.49 0.080 (14 S.W.G.) 2.0 a
11、 The tolerance on thickness shall be as defined in the material specification.BS SP 18 & 19:1949 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
12、 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. It is the constant aim of BSI to improve the quality of our products and
13、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 front cover. Tel:02089969000. Fax:02089967400. BSI offers members an indivi
14、dual 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 to Customer Services. Tel:02089969001. Fax:02089967001. In response to or
15、ders 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 information on national, European and international standards through its Libra
16、ry 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:02089967048. Subscribing members of BSI are kept up to date with standards developm
17、ents 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 publications. BSI also holds the copyright, in the UK, of the publications o
18、f 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, photocopying, recording or otherwise without prior written permission fr
19、om 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.
