1、BRITISH STANDARD AEROSPACE SERIES BS2 SP 148-150:1979 Specification for Unified aluminium alloy washers UDC 629.7:621.882.4:669.715BS2SP148-150:1979 This BritishStandard, having been prepared under the directionof the Aerospace Standards Committee, was published under the authority ofthe Executive B
2、oard and comesinto effect on 31October1979 BSI02-2000 The following BSI references relate to the work on this standard: Committee reference ACE/12 Draft for comment77/79092 DC ISBN 0 580 11011 7 Foreword Because of the difficulties reported in obtaining sheet material to produce washers to the requi
3、red imperial thicknesses, this1979 edition has been prepared to specify the washer thicknesses in metric units. Reasonable thickness tolerances are specified to cover a broad band of the sheet tolerances available. Imperial thickness materials may still be used if the overall tolerances are maintain
4、ed. Amendment No.1 (AMD1184) to the1970 edition, which specified dimensions of oversizes, has been incorporated. 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 Brit
5、ish Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, page1 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indi
6、cated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBS2SP148-150:1979 BSI 02-2000 i Contents Page Foreword Inside front coverii blankBS2SP148-150:1979 BSI 02-2000 1 All dimensions are in inches except for thickness T and the associated to
7、lerance. (The inch thicknesses in parentheses are for reference only.) Bolt thread size Size code A D BSSP148 BSSP149 BSSP150 Oversize hole (Y) T 0.07mm Mass lb/100 T 0.10mm Mass lb/100 T 0.14mm Mass lb/100 440 A 0.125 to0.120 0.220 to0.215 0.008 0.016 0.023 0.156 to0.151 632 B 0.151 to0.146 0.295 t
8、o0.290 0.016 0.032 0.049 0.182 to0.177 832 C 0.179 to0.174 0.365 to0.360 0.025 0.048 0.073 0.210 to0.205 1032 D 0.205 to0.200 0.400 to0.395 0.030 0.059 0.085 0.236 to0.231 1 / 4 28 E 0.270 to0.265 0.515 to0.505 0.041 0.082 0.120 0.301 to0.296 5 / 16 24 G 0.333 to0.328 0.585 to0.575 0.058 0.116 0.167
9、 0.364 to0.359 3 / 8 24 J 0.395 to0.390 0.660 to0.650 0.8mm 0.070 1.6 mm 0.139 2.5 mm 0.204 0.426 to0.421 7 / 16 20 L 0.458 to0.453 0.805 to0.795 (0.0315in) 0.112 (0.063in) 0.224 (0.0984 in) 0.318 0.489 to0.484 1 / 2 20 N 0.520 to0.515 0.875 to0.865 0.125 0.250 0.360 0.551 to0.546 9 / 16 18 P 0.583
10、to0.578 1.020 to1.010 0.177 0.354 0.516 0.614 to0.609 5 / 8 18 Q 0.645 to0.640 1.095 to1.085 0.202 0.404 0.579 0.676 to0.671 3 / 4 16 S 0.770 to0.765 1.235 to1.225 0.234 0.468 0.675 0.801 to0.796 7 / 8 14 U 0.895 to0.890 1.455 to1.445 0.336 0.672 0.975 0.926 to0.921 112 W 1.020 to1.015 1.670 to1.660
11、 0.455 0.910 1.290 1.051 to1.046 1. Material a : Aluminium alloy in accordance with BS L163; 2. Finish: Natural. 3. Temperature limitation:150 C. 4. Washers shall be free from surface defects, sharp edges, scale, pitting and burrs. 5. Washers shall be flat within a tolerance of0.005in with parallel
12、faces. 6. Washers may be rejected at any time for faults in, or revealed by, manufacture, although they may have previously been passed for chemical composition and mechanical properties. 7. Example of call-up: BSSP148B is a632 aluminium alloy washer0.8mm thick, standard size. BS SP148BY is a632 alu
13、minium alloy washer0.8mm thick, oversize. 8. Imperial thickness materials may be used provided that overall tolerances are maintained. a BS SP150(2.5mm) and BS SP149(1.6mm) up to D may be machined from aluminium alloy in accordance with BS L102.BS2 SP 148-150:1979 BSI 389 Chiswick High Road London W
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