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.BSSP21:1950 This British Standard, having been approved by the Aircraft Industry Standards Committee, and endorsed by the Chairman ofthe Engineering Divisional Council, was published under theauthority of
3、 the General Council of the Institution on28April 1950 BSI 02-2000 ISBN 0 580 34436 3 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 it
4、self 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 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amen
5、dment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBSSP21:1950 BSI 02-2000 i Contents Page 1 Scope 1 2 Material 1 3 Dimensions 1 4 Finish 1 5 Identification 1 Figure 1 Lubricating nipple 2ii blankBSSP21:1950 BSI 02-2000 1 1 Scope This British Standard de
6、als with a miniature lubricating nipple for aircraft 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 complyi
7、ng with either BS 1408, “Hard drawn steel wire for 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. A
8、ll screw threads shall be in accordance with BS 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
9、and spring shall have a natural finish and shall 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.BS SP 21:1950 2 BSI 02-2000 NOTES: i) Scale 4:1 ii) All dimensions in inches iii) Tolerances unless other
10、wise specified Figure 1 Lubricating nipple +.008 .0blankBS SP 21:1950 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 at the international level
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