BS-SP-107-112-1954.pdf

BRITISH STANDARD BS SP 107-112:1954 Incorporating Amendments Nos. 1, 2 and 3 Specifications for Tab washers for unified hexagons for aircraft* *For tab washers for use with British Standard hexagons, see BS SP 41-46, “Tab washers for aircraft.” ICS 49.030.50 ? Licensed Copy: London South Bank University, London South Bank University, Mon May 07 12:05:25 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS SP 107-112:1954 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 31 May 1954 © BSI 2007 ISBN 0 580 34425 8 This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 4 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 2577September 1956 5272July 1964 1712130 April 2007Indicated by a sideline in the margin Licensed Copy: London South Bank University, London South Bank University, Mon May 07 12:05:25 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS SP 107-112:1954 © BSI 2007i Contents Page 1Scope1 2Materials1 3Heat treatment1 4Dimensions1 5Finish1 6Protective treatment1 7Identification1 Appendix Recommended application of tab washers used with drilled holes4 Figure 1 Straight and angle tab washers2 Figure 2 Tab washers and drilled holes4 Table 1 British Standard numbers and materials1 Licensed Copy: London South Bank University, London South Bank University, Mon May 07 12:05:25 GMT+00:00 2007, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: London South Bank University, London South Bank University, Mon May 07 12:05:25 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS SP 107-112:1954 © BSI 20071 1 Scope These British Standards specify the materials, dimensions and finish of mild steel and corrosion-resisting steel straight, right angle and left angle tab washers for use with Unified hexagons for aircraft. A recommended method of application when washers are fitted into drilled holes is shown in the Appendix. 2 Materials The washers shall be manufactured from the appropriate material specified in Table 1. The grain of the material shall be at an angle of approximately 45° across the tabs of the washers. 3 Heat treatment Washers to BS SP 108, BS SP 110 and BS SP 112 (Chromium-nickel steel) shall be annealed at 1 050 to 1 080 °C for 5 to 10 minutes and cooled in still air. 4 Dimensions The washers shall conform to the dimensions specified in Table 2 and shall be supplied with the tabs bent as shown in Figure 1. 5 Finish 5.1 Washers to BS SP 108, BS SP 110 and BS SP 112 shall be barrelled after heat treatment by an approved method agreed with the purchaser to produce a matt finish. 5.2 The washers shall be free from surface defects, scale, pitting and burrs. Tabs after bending shall be free from corrugation, and any abnormal thickening of the width of the tab due to bending shall be removed. 6 Protective treatment Mild steel washers shall be cadmium plated in accordance with the latest issue of Ministry of Supply aircraft process specification D.T.D. 904. 7 Identification a) The washers shall be identified for ordering purposes by the relevant British Standard number (see Table 1), together with the appropriate code letter shown in Table 2, e.g. a corrosion-resisting steel straight tab washer suitable for a 5/8 in. thread would be BS SP 108 Q. b) All washers shall be identified as “Unified” by a rounded projection on the periphery complying with the dimensions shown in Table 2. Table 1 British Standard numbers and materials British Standard No. Type of washerMaterial BS SP 107 Straight tab Deep drawing carbon steel sheets and strips (suitable for welding) complying with BS S 511. BS SP 108Chromium-nickel steel sheets and strips (corrosion resisting) (13 ton 0.1 per cent proof stress) complying with BS S 521. BS SP 109 Right angle tab Deep drawing carbon steel sheets and strips (suitable for welding) complying with BS S 511. BS SP 110Chromium-nickel steel sheets and strips (corrosion resisting) (13 ton 0.1 per cent proof stress) complying with BS S 521. BS SP 111 Left angle tab Deep drawing carbon steel sheets and strips (suitable for welding) complying with BS S 511. BS SP 112Chromium-nickel steel sheets and strips (corrosion resisting) (13 ton 0.1 per cent proof stress) complying with BS S 521. Licensed Copy: London South Bank University, London South Bank University, Mon May 07 12:05:25 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS SP 107-112:1954 2 © BSI 2007 Surfaces within diameter S shall be flat within 0.005 in. and uniform in thickness. Figure 1 Straight and angle tab washers Licensed Copy: London South Bank University, London South Bank University, Mon May 07 12:05:25 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS SP 107-112:1954 © BSI 20073 DIMENSIONS AND CODE LETTERS To suit nominal thread size Code letter Inner diameter Outer diameter ThicknessLarge tabSmall tab Dia. of flat area of washer Identification pip ABCaDEFGHKRLMNPQST max. min. max. min. Carbon steel washers Corrosion- resisting steel washers ± 0.010 ± 0.010 ± 2° 0 +0.005 ± 0.005 ± 0.010 ± 0.005 No. 8 (.313 Hex size) A.175.170.320.310.022 (24SWG) .175.275.160.037.01550°.180.080.080.186.037.025.315.335 No. 10 (.344 Hex size) FOR THIS SIZE USE WASHERS TO BS SP 41-46 CODE LETTER C No. 10 (.375 Hex size) D.200.195.380.370.022 (24SWG) .200.295.190.037.01560°.210.110.095.226.037.025.3803.95 1/4 in. FOR THIS SIZE USE WASHERS TO BS SP 41-46 CODE LETTER E in.in.in.in.in.in.in.in.in.in.in.in.in.in.in.in.in.in.in. 5/16 in. G0.325 0.320 0.505 0.495 0.036 (20 S.W.G.) 0.032 (21 S.W.G.) 0.2800.4100.2500.0400.03060°0.280 0.1400.1000.3300.0500.0250.5400.520 3/8 in. J0.395 0.390 0.570 0.560 0.036 (20 S.W.G.) 0.032 (21 S.W.G.) 0.3200.4500.2800.0400.03060°0.320 0.1400.1400.3700.0500.0250.6200.590 7/16 in. L0.455 0.450 0.695 0.685 0.036 (20 S.W.G.) 0.036 (20 S.W.G.) 0.3900.5250.3450.0400.04560°0.380 0.1700.1500.4200.0500.0250.7400.720 1/2 in. N0.520 0.515 0.755 0.745 0.036 (20 S.W.G.) 0.036 (20 S.W.G.) 0.4250.5900.3750.0500.05060°0.420 0.2000.1500.4700.0500.0250.8200.780 9/16 in. P0.580 0.575 0.880 0.870 0.036 (20 S.W.G.) 0.036 (20 S.W.G.) 0.5000.6400.4400.0500.05080°0.480 0.2000.1500.5450.0750.0250.9400.910 5/8 in. Q0.645 0.640 0.940 0.930 0.036 (20 S.W.G.) 0.036 (20 S.W.G.) 0.5300.6800.4700.0500.05080°0.500 0.2000.1500.5700.0750.0250.9800.970 3/4 in. S0.770 0.765 1.065 1.055 0.036 (20 S.W.G.) 0.036 (20 S.W.G.) 0.5500.7300.5300.0600.05090°0.570 0.2300.1500.6700.1000.0251.1201.100 7/8 in. U0.895 0.890 1.255 1.245 0.036 (20 S.W.G.) 0.036 (20 S.W.G.) 0.6000.8600.6250.0600.05090°0.680 0.2600.1500.7950.1000.0251.3401.290 1 in.W1.020 1.015 1.440 1.430 0.036 (20 S.W.G.) 0.036 (20 S.W.G.) 0.6500.9500.7150.0600.10090°0.780 0.2900.1500.8700.1000.0251.5401.480 a The tolerance on thickness shall be as defined in the material specification. 0 +0.010 0 +0.010 0 +0.005 0 +0.010 +0.010 Licensed Copy: London South Bank University, London South Bank University, Mon May 07 12:05:25 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS SP 107-112:1954 4 © BSI 2007 Appendix Recommended application of tab washers used with drilled holes Figure 2 Tab washers and drilled holes Code letter of washer To suit nominal thread size A ± 0.005 in. B C Drill in.in.in. BS SP 107-112/ANo. 8 (.313 Hex Size) .197.100 3/32 BS SP 41-46/CNo. 10 (.344 Hex Size) .225.112 1/8 BS SP 107/112/DNo. 10 (.375 Hex Size) .225.112 1/8 BS SP 41-46/E 1/4 in. 5/16 in. 0.275 0.335 0.115 0.115 1/8 5/32 G BS SP 107-112J L N 3/8 in. 7/16 in. 1/2 in. 0.375 0.425 0.475 0.155 0.165 0.165 5/32 3/16 7/32 P Q S 916 in. 5/8 in. 3/4 in. 0.550 0.575 0.675 0.165 0.165 0.165 7/32 7/32 1/4 U W 7/8 in. 1 in. 0.800 0.875 0.165 0.165 9/32 5/16 0 +0.025 in. Licensed Copy: London South Bank University, London South Bank University, Mon May 07 12:05:25 GMT+00:00 2007, Uncontrolled Copy, (c) BSI blank Licensed Copy: London South Bank University, London South Bank University, Mon May 07 12:05:25 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS SP 107-112:1954 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: +44 (0)20 8996 9000. Fax: +44 (0)20 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: +44 (0)20 8996 9001. Fax: +44 (0)20 8996 7001. Email: ordersbsi-global.com. Standards are also available from the BSI website at http:/www.bsi-global.com. 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: +44 (0)20 8996 7111. Fax: +44 (0)20 8996 7048. Email: infobsi-global.com. 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: +44 (0)20 8996 7002. Fax: +44 (0)20 8996 7001. Email: membershipbsi-global.com. Information regarding online access to British Standards via British Standards Online can be found at http:/www.bsi-global.com/bsonline. Further information about BSI is available on the BSI website at http:/www.bsi-global.com. 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. Details and advice can be obtained from the Copyright & Licensing Manager. Tel: +44 (0)20 8996 7070. Fax: +44 (0)20 8996 7553. Email: copyrightbsi-global.com. Licensed Copy: London South Bank University, London South Bank University, Mon May 07 12:05:25 GMT+00:00 2007, Uncontrolled Copy, (c) BSI