BS-SP-122-TO-125-1958.pdf

BRITISH STANDARD BS SP 122 to 125:1958 Incorporating Amendment No. 1 Washers for unified hexagons for aircraft (primarily for packing purposes) Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:21:24 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS SP 122 to 125:1958 These British Standards, having been approved by the Aircraft Industry Standards Committee and endorsed by the Chairman of the Engineering Divisional Council, were published under the authority of the General Council of the Institution on 11 June 1958 © BSI 02-2000 The following BSI references relate to the work on this standard: Committee reference ACE/14 Draft for comment CX (ACE) 7919 ISBN 0 580 34568 8 Foreword These British Standards have been prepared at the request of the aircraft industry to provide a range of packing washers or use with aircraft bolts with Unified hexagons. 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 immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 and 2, an inside back cover 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 of issueComments 1182May 1973Indicated by a sideline in the margin Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:21:24 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS SP 122 to 125:1958 © BSI 02-2000i Contents Page ForewordInside front cover 1Scope1 2Materials1 3Dimensions1 4Finish1 5Freedom from defects1 6Identification1 Appendix Conversion of inches to millimetresInside back cover Figure 12 Table 1 British Standard numbers and materials1 Table 2 Dimensions2 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:21:24 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:21:24 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS SP 122 to 125:1958 © BSI 02-20001 1 Scope These British Standards specify the materials, dimensions and finish of mild steel, corrosion-resisting steel and aluminium alloy washers suitable for use with bolts with Unified hexagons for aircraft. The washers are intended primarily for use for packing purposes. 2 Materials The washers shall be manufactured from the appropriate material specified in Table 1. 3 Dimensions The washers shall conform to the dimensions specified in Table 2. NOTEThe figures in British units are to be regarded as the standard. A table to assist in the conversion of the dimensions to approximate metric equivalents is given in the Appendix. More accurate conversions should be based on the tables in BS 350. 4 Finish Mild steel washers shall be cadmium plated in accordance with the latest issue of Ministry of Supply aircraft process specification D.T.D.904. 5 Freedom from defects a) The washers shall be free from surface defects, scale, pitting and burrs. They shall be flat, within a tolerance of 0.005 in., with parallel faces. b) Washers may be rejected at any time for faults in, or revealed by, manufacture, although they have been made from material passed previously for chemical composition and mechanical properties. 6 Identification The washers shall be identified for any purpose by the relevant British Standard numbers (see Table 1), together with the appropriate code letter shown in Table 2. Where an oversize is required, the identity shall be suffixed by the letter Y. eg. BS SP 123J: A corrosion-resisting steel washer for use with a B in Unified bolt, standard size. BS SP 123JY: a corrosion-resisting steel washer for use with a B in Unified bolt, oversize. Table 1 British Standard numbers and materials British Standard No. Material DescriptionSpecificationa Thin washers: BS SP 122 BS SP 123 BS SP 124 Thick washers: BS SP 125 Steel Corrosion-resisting steel Aluminium alloy Aluminium alloy BS S 510 BS S 521 BS L 72 BS L 72 a Latest issue. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:21:24 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS SP 122 to 125:1958 2 © BSI 02-2000 Table 2 Dimensions Figure 1 To suit boltsCode letter Diameter ADiameter BOversizes (Y) max.min.max.min.max.min. in.in.in.in.inin No.440 UNCA0.1250.1200.2200.2150.1560.151 No.632 UNCB0.1510.1460.2950.2900.1820.177 No.832 UNCC0.1790.1740.3650.3600.2100.205 No. 1032 UNFD0.2050.2000.4000.3950.2360.231 1/4in. UNF E0.2700.2650.5150.5050.3010.296 5/16in. UNF G0.3330.3280.5850.5750.3640.359 3/8in. UNF J0.3950.3900.6600.6500.4260.421 7/16in. UNF L0.4580.4530.8050.7950.4890.484 1/2in. UNF N0.5200.5150.8750.8650.5510.546 9/16in. UNF P0.5830.5781.0201.0100.6140.609 5/8in. UNF Q0.6450.6401.0951.0850.6760.671 3/4in. UNF S0.7700.7651.2351.2250.8010.796 7/8in. UNF U0.8950.8901.4551.4450.9260.921 1 in.UNFW1.0201.0151.6701.6601.0511.046 * The tolerance on thickness is to be as defined in the material specification. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:21:24 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS SP 122 to 125:1958 © BSI 02-2000 Appendix Conversion of inches to millimetres Approximate metric equivalents of the dimensions in this British Standard may be obtained from the following table. More accurate conversions should be based on the tables in BS 350. Examples of use of table: in.mm 1 2 3 4 5 6 7 8 9 10 25.4 50.8 76.2 101.6 127.0 152.4 177.8 203.2 228.6 254.0 0.048 in. = 1.016 + 0.2032= 1.2 mm. 1.670 in. = 25.4 + 15.24 + 1.778 = 42.4 mm. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:21:24 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS SP 122 to 125:1958 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British Standards 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 services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel: 020 8996 9000. Fax: 020 8996 7400. 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 to Customer Services. Tel: 020 8996 9001. Fax: 020 8996 7001. In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested. Information on standards BSI provides a wide range of information 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: 020 8996 7111. Fax: 020 8996 7048. 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: 020 8996 7002. Fax: 020 8996 7001. Copyright Copyright subsists in all BSI publications. 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, 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: 020 8996 7070. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:21:24 GMT+00:00 2006, Uncontrolled Copy, (c) BSI