BS SP 18 & 19-1949 Specification for washers for aircraft purposes (primarily for use with timber)《航空用垫圈规范(主要供木制品用)》.pdf

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

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