1、BRITISH STANDARD AEROSPACE SERIES BS2SP 154-156:1979 Specification for Unified corrosion-resistant steel washers Index title: Washers, unified, corrosion-resistant steel UDC629.7:621.882.4:669.14.018.8BS2SP154-156:1979 This BritishStandard, having been prepared under the directionof the Aerospace St
2、andards Committee, was published under the authority ofthe Executive Board 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 11013 3 Foreword Because of the difficultie
3、s reported in obtaining sheet material to produce washers to the required 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 thickn
4、ess materials may still be used if the overall tolerances are maintained. Amendment No.1 (AMD1186) 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
5、 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, pagesi andii, page1 and a back cover. This standard has been updated (see copyr
6、ight 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 CommentsBS2SP154-156:1979 BSI 02-2000 i Contents Page Foreword Inside front coverii blankBS2SP154-156:1979 BSI 02-2000 1 All
7、 dimensions are in inches except for thickness T and the associated tolerance. (The inch thicknesses in parentheses are for reference only.) Bolt thread size Size code A D BSSP154 BSSP155 BSSP156 Oversize hole (Y) Mass lb/100 T 0.10mm Mass lb/100 T 0.14mm Mass lb/100 440 A 0.125 to0.120 0.220 to0.21
8、5 0.8mm (0.0315in) 0.023 1.6mm (0.063in) 0.046 2.5mm (0.0984in) 0.071 0.156 to0.151 632 B 0.151 to0.146 0.295 to0.290 0.044 0.090 0.140 0.182 to0.177 832 C 0.179 to0.174 0.365 to0.360 0.068 0.136 0.220 0.210 to0.205 1032 D 0.205 to0.200 0.400 to0.395 0.082 0.164 0.257 0.236 to0.231 1 / 4 28 E 0.270
9、to0.265 0.515 to0.505 0.113 0.226 0.415 0.301 to0.296 5 / 16 24 G 0.333 to0.328 0.585 to0.575 0.162 0.324 0.499 0.364 to0.359 3 / 8 24 J 0.395 to03.90 0.660 to0.650 0.193 0.386 0.605 0.426 to0.421 7 / 16 20 L 0.458 to0.453 0.805 to0.795 0.307 0.614 0.952 0.489 to0.484 1 / 2 20 N 0.520 to0.515 0.875
10、to0.865 0.350 0.700 1.076 0.551 to0.546 9 / 16 18 P 0.583 to0.578 1.020 to1.010 0.493 0.986 1.525 0.614 to0.609 5 / 8 18 Q 0.645 to0.640 1.095 to1.085 0.563 1.126 1.706 0.676 to0.671 3 / 4 16 S 0.770 to0.765 1.235 to1.225 0.653 1.306 2.033 0.801 to0.796 7 / 8 14 U 0.895 to0.890 1.455 to1.445 0.935 1
11、.870 2.873 0.926 to0.921 112 W 1.020 to1.015 1.670 to1.660 1.250 2.500 3.821 1.051 to1.046 1. Material a : Corrosion resistant steel in accordance with BSS526 or BSS527. 2. Finish: Natural. 3. Temperature limitation:450 C. 4. Washers shall be free from surface defects, sharp edges, scale, pitting an
12、d burrs. 5. Washers shall be flat within a tolerance of0.005in with parallel 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: BS SP154B is
13、 a632 Corrosion resistant steel washer0.8mm thick, standard size. BS SP154BY is a632 Corrosion resistant steel washer0.8mm thick, oversize. 8. Imperial thickness materials may be used provided that overall tolerances are maintained. a BS SP156(2.5mm) andBSSP155(1.6mm) up toD may be machined from cor
14、rosion resistant steel in accordance withBSS130. T +0.05 mm 0.08 mmBS2SP 154-156:1979 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 int
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