BS 3410 1961 Washers

BRITISH STANDARDOBSOLESCENT MAY 1986 BS 3410:1961 Specification for Metal washers — For general engineering purposes UDC 621.882.4 BS 3410:1961 Co-operating organizations The Mechanical Engineering Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations: Admiralty* Air Ministry Associated Offices’ Technical Committee Association of Consulting Engineers (Incorporated) British Chemical Plant Manufacturers’ Association British Compressed Air Society British Electrical and Allied Manufacturers’ Association* British Engineers’ Association* British Gear Manufacturers’ Association British Internal Combustion Engine Manufacturers’ Association* British Iron and Steel Federation* British Railways, The British Transport Commission* Crown Agents for Oversea Governments and Administrations* D.S.I.R. — National Engineering Laboratory Electricity Council, The Generating Board and the Area Boards in England and Wales Engineering Equipment Users’ Association* Gas Council High Commission of India* Institute of Marine Engineers Institute of Petroleum Institution of Civil Engineers Institution of Gas Engineers Institution of Heating and Ventilating Engineers Institution of Mechanical Engineers Institution of Mechanical Engineers (Automobile Division) Institution of Production Engineers* Locomotive and Allied Manufacturers’ Association of Great Britain* Machine Tool Trades Association* Ministry of Labour (Factory Inspectorate) Ministry of Power Ministry of Transport Ministry of Works National Coal Board National Physical Laboratory (D.S.I.R.)* Radio Industry Council* War Office* The Government departments and scientific and industrial organizations marked with an asterisk in the above list, together with the following, were directly represented on the Committee entrusted with the preparation of this standard: Agricultural Engineers’ Association Black Bolt & Nut Association of Great Britain Bright Bolt & Nut Manufacturers’ Association Bright Steel Bar Association British Constructional Steelwork Association British Cycle & Motor Cycle Industries Association Limited Council of British Manufacturers of Petroleum Equipment Electronic Engineering Association Heat Treated Bolt Association Institute of Iron & Steel Wire Manufacturers London Transport Executive, The British Transport Commission Ministry of Aviation Oil Companies Materials Association Post Office Rolled Thread Screw Association Screw Manufacturers’ Association Society of Motor Manufacturers & Traders Limited Washer Manufacturers’ Association Individual firms This British Standard, having been approved by the Mechanical Engineering Industry Standards Committee and endorsed by the Chairman of the Engineering Divisional Council, was published under the authority of the General Council on 1 September 1961 © BSI 02-2000 The following BSI references relate to the work on this standard: Committee references MEE/60 MEE/60/6 Draft for comment A(MEE)4400 ISBN 0 580 34594 7 Amendments issued since publication Amd. No. Date Comments and American Number size fasteners 3 Table 3 — Small bright washers for use with UNC. UNF. UNF.S. fasteners 6 Table 6 — Large bright washers for automobile purposes for use with UNC.W.W. and B.S. B.F.W and B.BS 3410:1961 Contents Page Co-operating organizations Inside front cover Foreword ii Part 1: Bright metal washers 1 Scope 1 2 Material 1 3 Finish 1 4 Coating 1 5 Dimensions 1 Part 2: Black metal washers 6 Scope 8 7 Material 8 8 Finish 8 9 Dimensions 8 Table 1 — Small bright washers for use with B. B.F. fasteners 7 Table 7 — Ordinary black washers 9 Table 8 — Large black washers 10 Table 9 — Small light gauge black washers 11 Table 10 — Round black washers with square holes for woodwork and timber constructions 12 Table 11 — Square black washers with round holes 13 Table 12 — Square or D-shaped taper washers 14 © BSI 02-2000 i .S.W and B. B. and B. fasteners 5 Table 5 — Medium bright washers for automobile purposes for use with UNC.S.F.F fasteners 4 Table 4 — Large bright washers for use with UNC.S.S. UNF.S. B.A.S.A. UNF. and American Number size fasteners 2 Table 2 — Large bright washers for use with B. BS 3410:1961 Foreword This standard makes reference to the following British Standards: BS 15. the demand for an unnecessary multiplicity of specials can in fact be eliminated. This will be indicated in the amendment table on the inside front cover. nuts (UNC and UNF threads) and plain washers — normal series”. “Black bolts. screws and nuts (UNC and UNF threads) and plain washers — normal series”. BS 310. BS 916. 1) ii © BSI 02-2000 . The present standard. screws. Tables of washers which are superseded by this standard are contained in the following British Standards: BS 57. screws and nuts. bolts. but it is hoped that by establishing a standard series of metal washers which should meet most general engineering requirements. BS 265. an inside front cover.1) accordingly provides for metal washers in a greater variety of diameters and thicknesses and is based upon what experience has shown to be the greatest popular demand. “B. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover. nuts and washers”. BS 1768. Steel plate. BS 1449. “Precision hexagon bolts. BS 2466. BS 1083. “Unified precision hexagon bolts. but it has been felt for some time that these provisions did not adequately represent either users’ requirements or current manufacturing practice. nuts and plain washers — heavy series”. BS 1769. pages 1 to 14 and a back cover. Blackheart malleable iron castings. This standard has been updated (see copyright date) and may have had amendments incorporated. “Unified machine screws and machine screw nuts”. BS 1981. At first sight this may appear contrary to normal standardization procedure. BS 325. Whiteheart malleable iron castings. Structural steel. Tables for plain washers have hitherto been included in standards for bolts. Cold rolled brass sheet. BS 309. nuts and plain washers”. BS 2708. screws.A. pages i and ii. screws and nuts”. copper content 61. A British Standard does not purport to include all the necessary provisions of a contract. which is intended to supersede these existing tables. strip and foil. “Black taper washers”. “Black cup and countersunk bolts. screws. This British Standard has been prepared under the authority of the Mechanical Engineering industry Standards Committee. screws. sheet and strip. nuts and plain washers”. Users of British Standards are responsible for their correct application. “Unified black square and hexagon bolts.5 per cent minimum and under 64 per cent maximum. “Unified black hexagon bolts. 2 Material Steel washers shall be made from En2 cold rolled steel in the hard condition in accordance with BS 1449. and B.A. he shall specify his requirements in his enquiry or order.W. tables of dimensions for bright washers for automobile use are included in this part of the standard. If the purchaser requires the washers to be manufactured from steel or brass in any other condition.S. General requirements for material and finish of bright washers are also given. fasteners.F. If chamfered washers are required this should be specified by the purchaser in his enquiry or order. 5 Dimensions The dimensions of bright washers shall be in accordance with Table 1 to Table 6 inclusive.5 per cent minimum and under 64 per cent maximum”. or of another material. Standard washers will normally be supplied unchamfered. strip and foil copper content 61. this shall be specified by the purchaser in his enquiry or order. and American Number size fasteners and two grades of thickness are specified for washers for use with Unified. 4 Coating If the washers are required to have a protective or decorative finish. In addition.S. © BSI 02-2000 1 .BS 3410:1961 Part 1: Bright metal washers 1 Scope Part 1 of this British Standard relates to bright metal washers for use with standard fasteners and for other general purposes. “Steel plate. sheet and strip”. Brass washers shall be made from material in the hard condition in accordance with BS 265. Dimensions are given for large and small washers: one grade of thickness is specified for those intended for use with B. “Cold rolled brass sheet. 3 Finish The washers shall be reasonably flat and free from burrs. B. 094 0. in Outside diameter B max.140 0.099 0.172 0.223 0.180 0.296 0.040 NOTE The sizes shown in heavy type are those which are designated “Preferred” in BS 57.251 0.500 0.341 0.111 0.443 0. 2 © BSI 02-2000 . size 2 3 4 5 6 Thicknessa C S.495 25 24 23 23 22 22 21 20 19 0.106 0. a Subject to the normal manufacturing tolerances on the sheet or strip as specified in the appropriate British Standards.157 0.A.233 0.032 0.197 0.123 0.024 0.022 0. in min.228 0.185 0.028 0. in 8 7 6 5 4 3 2 1 0 2 3 4 5 6 8 10 12 — 0.BS 3410:1961 Table 1 — Small bright washers for use with B.202 0. nuts and plain washers”.203 0.W. American No.036 0. screws.391 0. bolts.G.256 0.135 0.118 0.024 0.A.208 0.152 0.386 0. in min.268 0. No.336 0. and American Number size fasteners see Clause 3 1 B.263 0. “B. in Diameter of hole A max.A.028 0.301 0.438 0.228 0.020 0.177 0. A.049 0.283 0.BS 3410:1961 Table 2 — Large bright washers for use with B.192 0.560 0.086 0.016 0.348 0.500 0. American No.378 0.177 0.A.125 0.092 0.157 0.228 0.135 0.176 0.625 0.016 0.202 0.330 0.078 0. in 14 12 10 9 8 7 6 5 4 3 2 1 0 — — 0 1 2 3 4 5 6 8 10 12 — 0. size 2 3 4 5 6 Thicknessa C S.373 0. in min.197 0.056 0.016 0.061 0.140 0.152 0.118 0.565 0.172 0.094 0.495 0.048 0.251 0. in Diameter of hole A max.099 0.036 0.106 0. nuts and plain washers”.028 0. screws.081 0.056 NOTE The sizes shown in heavy type are those which are designated “Preferred” in BS 57.223 0.427 0. in Outside diameter B max.288 0.620 27 27 27 27 25 22 20 20 19 19 18 18 17 0.097 0. a Subject to the normal manufacturing tolerances on the sheet or strip as specified in the appropriate British Standards.335 0.020 0.171 0.W.130 0.257 0. bolts.252 0.044 0.036 0.G.A. and American Number size fasteners see Clause 3 1 B.073 0. in min.197 0.040 0.040 0. “B.223 0.256 0.123 0. © BSI 02-2000 3 .432 0.016 0.111 0.228 0. 781 2.W.745 0.328 0.W. fasteners see Clause 1 Nominal size of bolt or screw in 2 3 4 5 Diameter of hole A max.458 0. sizes. size For inch size 3 7 use B. UNF.125 2.S.870 0.781 0.056 0.A.270 0. size /32 /8 5/ 32 3 1 7 5 3 /16 /32 2 1 4 © BSI 02-2000 .562 0. for which dimensions are given in Table 1.776 2.S.625 2.176 0.250 1.031 1.115 2.040 0.192 0.355 2.995 1.026 0. in Light gauge S. For inch size use B.036 0.906 1.072 0.072 0.026 1.212 0.000 1.104 0.072 0.A.265 0.651 0.151 1. B.240 1.625 0. in min.605 2.515 0. NOTE Attention is drawn to the fact that when small fractional size washers not tabulated here are required.620 0.395 0.375 3. in /4 5 /16 3 /8 1 0. the following B.156 1.031 0.048 0.116 0. are suitable.875 2.401 1.500 1.656 0.212 20 19 18 18 17 17 15 15 15 15 13 11 — — — — 0.333 0.776 0.588 0.072 0.G.F.345 3.176 0.865 2.072 0. in min.875 1.281 1. in 3 7 Thicknessa C 6 Heavy gauge S.490 1.526 1.144 0.072 0.390 0.092 0.A.BS 3410:1961 Table 3 — Small bright washers for use with UNC.615 1.056 0.092 0.855 3.750 0.G.276 1.593 0.W.125 1.531 1.375 2. and B.875 3.557 0.128 0.056 0.092 0.115 1.625 0.520 0.048 0.116 — — — — /16 1/ 2 9/ 16 7 /8 /4 7 /8 5 3 1 11/8 11/4 13/8 11/2 13/4 2 a Subject to the normal manufacturing tolerances on the sheet or strip as specified in the appropriate British Standards. in Outside diameter B max.453 0.625 1.160 0.406 1.901 1.595 17 15 15 13 13 12 11 10 9 8 7 7 6 6 5 5 0.192 0. 048 0.125 3.072 0.776 0.750 0.531 1. size For inch size use B.995 1.906 1.056 0.625 1.875 3.212 19 18 18 17 17 17 15 15 15 13 12 11 10 10 10 10 0.125 1.515 0.625 2.620 0.192 0.328 0. for which dimensions are given in Table 2.176 0.031 1.056 0.595 4.625 0. in Outside diameter B max.406 1. and B.A.G.040 0.S.588 0. in Light gauge S.526 1. the following B. in 0.375 2.375 1.144 0. fasteners see Clause 3 1 Nominal size of bolt or screw in 1/ 4 5/ 16 3 /8 2 3 4 5 6 Thicknessa C Heavy gauge S.240 1.656 0.125 0.160 0.125 2.395 0. in min. UNF.401 1.458 0.104 0.212 0.355 2.115 1.781 2.092 0.151 1.128 0. NOTE Attention is drawn to the fact that when small fractional size washers not tabulated here are required.056 0.F.056 0.156 1.870 0.875 2.W.072 0.128 0.026 0.031 0.026 1.128 0.095 17 15 15 13 13 12 11 10 9 8 7 7 6 6 5 5 0.520 0.390 0. are suitable.865 2. size /16 /32 1 /8 10 7 5 /32 /16 7 /32 5 3 3 2 1 © BSI 02-2000 5 .625 4.855 3.048 0.072 0.250 1.276 1.333 0.270 0. For inch size 1 3 use B.176 0. B. sizes.095 3.W.072 0.092 0. in 7 Diameter of hole A max.781 0.281 1.128 /16 /2 9/ 16 7 1 /8 /4 7 /8 5 3 1 11/8 11/4 13/8 11/2 13/4 2 a Subject to the normal manufacturing tolerances on the sheet or strip as specified in the appropriate British Standards.115 2.875 1.192 0.W.365 1.116 0.615 1.593 0.116 0.265 0.901 1.A.776 2.128 0.651 0. in min.072 0.092 0.A.G.BS 3410:1961 Table 4 — Large bright washers for use with UNC.453 0.S.745 0.000 1.104 0.605 2. 865 2. and B.375 1.S.593 0.995 1.240 1.625 1.G. 6 © BSI 02-2000 .333 0.000 1.328 0.W. UNF.588 0.270 0.115 2.265 0.026 0.104 0.072 0.W.520 0.776 0.875 2.901 1.S.870 0.875 1.355 16 15 14 13 12 11 10 9 8 6 0.515 0.BS 3410:1961 Table 5 — Medium bright washers for automobile purposes for use with UNC.192 /16 /2 9 /16 7 1 /8 /4 7 /8 5 3 1 a Subject to the normal manufacturing tolerances on the sheet or strip as specified in the appropriate British Standards.651 0.615 1.115 1.395 0.453 0.375 0.745 0.656 0.080 0.031 0.064 0.116 0.390 0. in min. in Diameter of hole A max.144 0. in min. B. fasteners 1 Nominal size of bolt or screw in 2 3 4 5 6 Thicknessa C S.125 2.128 0. in /4 /16 3/ 8 1 5 0.781 0.906 1.365 1.750 0.125 1.458 0.F.250 1.092 0. in Outside diameter B max.160 0. 240 1.W. in Outside diameter B max.781 0.588 0.064 0.740 1.625 1.250 2.500 2.265 0. and B.365 1.328 0.515 0.250 1.375 1.520 0. B.031 0.270 0.116 0.000 2.BS 3410:1961 Table 6 — Large bright washers for automobile purposes for use with UNC.160 0.S.092 0.026 1. in min.750 0.128 0.080 0.776 0.458 0.480 2.500 1.F. in min.995 1.490 1.901 1. © BSI 02-2000 7 .906 1.000 1.750 2.104 0.G. UNF.128 0.395 0.453 0.656 0. in /4 /16 3 /8 1 5 0.333 0.651 0.S. in Diameter of hole A max.730 16 14 13 12 11 10 10 9 8 6 0.W.192 /16 /2 9 /16 7 1 /8 /4 7 /8 5 3 1 a Subject to the normal manufacturing tolerances on the sheet or strip as specified in the appropriate British Standards.615 1.144 0.593 0.990 2.240 2. fasteners 1 Nominal size of bolt or screw in 2 3 4 5 6 Thicknessa C S.390 0. i) Flat. b) Malleable cast iron type. large black washers. “Structural steel” with a tensile strength of 28/33 tons per sq in.BS 3410:1961 Part 2: Black metal washers 6 Scope Part 2 of this British Standard relates to black steel washers and malleable cast iron washers for use with standard bolts and for other general purposes. steel or malleable cast iron square or D-shaped taper washers. round black washers with square holes for woodwork and timber. flat washers shall be made from mild steel. 7 Material a) Steel washers. ii) Taper. c) The dimensions of square black washers with round holes shall be in accordance with Table 11.” 8 © BSI 02-2000 . smooth and free from burrs. Table 8 and Table 9. “Whiteheart malleable iron castings.” or ii) Malleable cast iron (blackheart) in accordance with BS 310. Dimensions are specified for the following types of washers: ordinary black washers. b) The dimensions of round black washers with square holes shall be in accordance with Table 10. Unless otherwise specified. NOTE The washers specified in this standard are not suitable for use with the fasteners covered by BS 3139. General requirements for material and finish are also given. These shall be made from either i) Malleable cast iron (whiteheart) in accordance with BS 309. square black washers with round holes. 9 Dimensions a) The dimensions of round black washers with round holes shall be in accordance with Table 7. “Blackheart malleable iron castings. 8 Finish The faces of the washers shall be reasonably flat. Taper washers shall be made from mild steel to BS 15. d) The dimensions of square or D-shaped black taper washers shall be in accordance with Table 12. “High strength friction grip bolts for structural engineering” which includes its own provision for washers. small light gauge black washers. 064 0.G.212 /16 1 /2 9 /16 7 5/ 8 3 /4 7 /8 /32 /16 /8 1 11/8 11/4 13/8 15/8 17/8 21/8 23/8 25/8 27/8 31/8 33/8 35/8 37/8 41/8 11/ 16 13 /16 15 /16 1 11/8 11/4 13/8 11/2 15/8 13/4 17/8 2 11/16 13/16 13/8 11/2 15/8 13/4 17/8 2 21/8 © BSI 02-2000 9 .104 0.144 0.104 0.192 0.212 0.176 0.BS 3410:1961 Table 7 — Ordinary black washers 1 Nominal size of bolt in 2 Diameter of hole A Tolerance + 1/32 in in 3 Outside diameter B in 4 Thickness C Tolerance ± 1 gauge S.192 0.176 0.080 0.128 0.128 0.080 0.212 0. in /4 /16 3 /8 1 5 /32 11 /32 13 /32 9 15 9 5 /8 /4 7 /8 5 3 16 14 14 12 12 10 10 9 8 7 7 6 6 6 5 5 5 5 0.212 0.192 0.W.160 0. 176 0.W.104 0.144 0.128 0.192 0.212 0.104 0.192 0.160 0.128 0.BS 3410:1961 Table 8 — Large black washers 1 Nominal size of bolt in 2 Diameter of hole A Tolerance + 1/32 in in 3 Outside diameter B in 3 7 4 Thickness C Tolerance ± 1 gauge S.104 0.212 0.212 1 11/8 11/4 13/8 11/2 15/8 13/4 17/8 2 11/16 13/16 13/8 11/2 15/8 13/4 17/8 2 21/8 10 © BSI 02-2000 .104 0.192 0.176 0. in /4 /16 3 /8 1 5 7/ 16 1 /2 9 /16 5/ 8 3 /4 7 /8 /32 11 /32 13 /32 9 15/ 32 9 /16 5 /8 11/ 16 13 /16 15 /16 /4 /8 1 11/8 11/4 13/8 11/2 13/4 2 21/4 21/2 23/4 3 31/4 31/2 33/4 4 41/4 12 12 12 12 12 10 10 9 8 7 7 6 6 6 5 5 5 5 0.G.104 0.212 0. 080 0.080 0.064 0.080 0.064 0.080 0.080 0. in /4 /16 3 /8 1 5 /32 11 /32 13 /32 9 /16 /8 3 /4 9 5 7 16 16 16 16 16 14 14 14 14 14 14 14 14 14 0.BS 3410:1961 Table 9 — Small light gauge black washers 1 Nominal size of bolt in 2 Diameter of hole A Tolerance + 1/32 in in 3 Outside diameter B in 4 Thickness C Tolerance ± 1 gauge S.G.080 /16 1 /2 9 /16 7 5/ 8 3 /4 7 /8 /32 17 /32 19 /32 15 21/ 32 25 /32 29 /32 /8 1 11/8 11/4 11/2 15/8 17/8 21/8 23/8 25/8 27/8 1 11/8 11/4 13/8 11/2 11/32 15/32 19/32 113/32 117/32 © BSI 02-2000 11 .080 0.W.064 0.064 0.064 0.080 0.080 0. in /8 /2 5 /8 3 1 3/ 4 7 /8 /16 /16 11 /16 7 9 13/ 16 15 /16 11/16 1 /4 11/2 2 1 11 10 9 8 5 5 0.BS 3410:1961 Table 10 — Round black washers with square holes for woodwork and timber constructions 1 Nominal size of bolt in 2 Width of hole A Tolerance + 1/32 in in 3 Outside diameter B in 4 Thickness C Tolerance ± 1 gauge S.160 0.W.212 1 21/4 25/8 3 12 © BSI 02-2000 .128 0.G.212 0.144 0.116 0. 192 0.192 0. in /8 /2 /16 /16 1 /2 2 11/2 2 2 10 10 10 6 3 10 6 3 10 3 3 3/0 3 3/0 0.128 0.372 0.G.372 1 9 5 /8 11 /16 3 21/2 3 /4 13 /16 3 3 4 21/2 3 3 4 4 7/ 8 15/ 16 1 11/16 11/4 13/8 4 © BSI 02-2000 13 .128 0.252 0.BS 3410:1961 Table 11 — Square black washers with round holes 1 Nominal size of bolt in 3 2 Diameter of hole A Tolerance + 1/32 in in 7 1 3 Outside square B in 4 Thickness C Tolerance ± 1 gauge S.128 0.252 0.252 0.128 0.W.252 0.252 0.128 0. 14 © BSI 02-2000 .BS 3410:1961 Table 12 — Square or D-shaped taper washers 1 Nominal size of bolt in 2 Diameter of hole> A Tolerance + 1/32 in in 3 Overall size B in 4 Mean thickness C 3° and 5° in 8° in /8 /2 5 /8 3 1 /16 /16 11 /16 7 9 1 11/4 11/2 13/4 2 21/4 /16 /16 3 /16 3 3 /4 /4 1 /4 1 1 /4 7 /8 1 3 /16 15 /16 1 1 /16 13 /16 3 /16 3 /16 3 /4 /4 1 /4 1 1 * Angle of taper may be 3°. 5° or 8°. > Centre hole to be parallel to within 4°. blank . 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