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1、BRITISH STANDARD CONFIRMED APRIL 1998 BS SP 21:1950 (Formerly A.G.S. 554) Specification for Lubricating nipples For aircraft purposes NOTEThe Institution desires to call attention to the fact that this standard is intended to include the technical provisions necessary for the supply of the material
2、herein referred to, but does not purport to comprise all the necessary provisions of a contract. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:19:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS SP 21:1950 This British Standard, having been approved by the
3、Aircraft Industry Standards Committee, and endorsed by the Chairman of the Engineering Divisional Council, was published under the authority of the General Council of the Institution on 28 April 1950 BSI 02-2000 ISBN 0 580 34436 3 A British Standard does not purport to include all the necessary prov
4、isions 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 a
5、nd 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 Comments Licensed Copy: London South Bank University, London South
6、Bank University, Sat Dec 09 03:19:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS SP 21:1950 BSI 02-2000i Contents Page 1Scope1 2Material1 3Dimensions1 4Finish1 5Identification1 Figure 1 Lubricating nipple2 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:19:
7、22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:19:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS SP 21:1950 BSI 02-20001 1 Scope This British Standard deals with a miniature lubricating nipple for airc
8、raft use. 2 Material The body of the nipple shall be machined from an aluminium alloy complying, with BS 1476, “Wrought aluminium or aluminium alloy bars, rods and sections,” material HE. 11 W.P. The spring shall be manufactured from steel wire complying with either BS 1408, “Hard drawn steel wire f
9、or springs,” En. 49B, Range 3, or Ministry of Supply Aircraft Material Specification D.T.D. 215, latest issues. The ball shall be of ball-bearing quality steel. 3 Dimensions The nipple shall conform to the dimensions and tolerances shown in Figure 1. All screw threads shall be in accordance with BS
10、84 “Screw threads of Whitworth form” and shall conform to the “medium fit” limits and tolerances. 4 Finish The body of the nipple shall be anodized in accordance with Ministry of Supply Aircraft Process Specification D.T.D. 910, latest issue. The ball and spring shall have a natural finish and shall
11、 be coated with oil. 5 Identification The nipple shall be identified, for ordering purposes, by the number of this British Standard, i.e. BS SP 21. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:19:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS SP 21:1950
12、2 BSI 02-2000 NOTES: i) Scale 4 : 1 ii) All dimensions in inches iii) Tolerances unless otherwise specified Figure 1 Lubricating nipple +.008 .0 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:19:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI blank Licensed Co
13、py: London South Bank University, London South Bank University, Sat Dec 09 03:19:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS SP 21:1950 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It
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22、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 03:19:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI