Machinery's Handbook, 31st Edition
1772
Washers British Standard Single Coil Square Section Spring Washers; Metric Series.— Type A-1 BS 4464:1969 (2004)
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r X X British Standard Single Coil Square Section Spring Washers; Metric Series.— Type A-2 BS 4464:1969 (2004) Nom. Size, d Inside Dia., d 1 Thickness & Width, s O.D., d 2 Max. Radius, r Max. Max. Min. M3 3.3 3.1 1 ± 0.1 5.5 0.3 (M3.5) 3.8 3.6 1 ± 0.1 6.0 0.3 M4 4.35 4.1 1.2 ± 0.1 6.95 0.4 M5 5.35 5.1 1.5 ± 0.1 8.55 0.5 M6 6.4 6.1 1.5 ± 0.1 9.6 0.5 M8 8.55 8.2 2 ± 0.1 12.75 0.65 M10 10.6 10.2 2.5 ± 0.15 15.9 0.8 M12 12.6 12.2 2.5 ± 0.15 17.9 0.8 (M14) 14.7 14.2 3 ± 0.2 21.1 1.0 M16 16.9 16.3 3.5 ± 0.2 24.3 1.15 (M18) 19.0 18.3 3.5 ± 0.2 26.4 1.15 M20 21.1 20.3 4.5 ± 0.2 30.5 1.5 (M22) 23.3 22.4 4.5 ± 0.2 32.7 1.5 M24 25.3 24.4 5 ± 0.2 35.7 1.65 (M27) 28.5 27.5 5 ± 0.2 38.9 1.65 M30 31.5 30.5 6 ± 0.2 43.9 2.0 (M33) 34.6 33.5 6 ± 0.2 47.0 2.0 M36 37.6 36.5 7 ± 0.25 52.1 2.3 (M39) 40.8 39.6 7 ± 0.25 55.3 2.3 M42 43.8 42.6 8 ± 0.25 60.3 2.65 (M45) 46.8 45.6 8 ± 0.25 63.3 2.65 M48 50.0 48.8 8 ± 0.25 66.5 2.65 All dimensions are in millimeters. Sizes shown in parentheses are nonpreferred and are not usually stock sizes. British Standard for Metric Series Metal Washers.— BS 4320:1968 (1998) specifies bright and black metal washers for general engineering purposes. r Section X X h = 2 s ± 15% Bright Metal Washers: These washers are made from either CS4 cold-rolled strip steel BS 1449:Part 3B or from CZ 108 brass strip BS 2870: 1980, both in the hard condition. However, by mutual agreement between purchaser and supplier, washers may be made available with the material in any other condition, or they may be made from another material, or may be coated with a protective or decorative finish to some appropriate British Standard. Washers are reasonably flat and free from burrs and are normally supplied unchamfered. They may, however, have a 30-degree chamfer on one edge of the external diameter. These washers are made available in two size categories, normal and large diameter, and in two thicknesses, normal (Form A or C) and light (Form B or D). The thickness of a light-range washer is from 1 ∕ 2 to 2 ∕ 3 the thickness of a normal range washer. Black Metal Washers: These washers are made from mild steel, and can be supplied in three size categories designated normal, large, and extra large diameters. The normal- diameter series is intended for bolts ranging from M5 to M68 (Form E washers), the large- diameter series for bolts ranging from M8 to M39 (Form F washers), and the extra large series for bolts from M5 to M39 (Form G washers). A protective finish can be specified by the purchaser in accordance with any appropriate British Standard.
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