Machinery's Handbook, 31st Edition
Washers
1771
British Standard Double Coil Rectangular Section Spring Washers; Metric Series.—Type D BS 4464:1969 (2004)
b
d 2
d
1
r
r
s
X
b
r
r
X
Section X X
h ≈ 5 s
Inside Dia., d 1
Radius, r Max.
Nom. Size, d
Width, b
Thickness, s 0.5 ± 0.05 0.6 ± 0.05
O.D., d 2 Max.
Max.
Min.
M2
2.4 2.6 2.9 3.6 4.1 4.6 5.6 6.6 8.8
2.1 2.3 2.6 3.3 3.8 4.3 5.3 6.3 8.4
4.4 4.8 5.5 6.2 7.5 8.0 9.8
0.15
0.9 ± 0.1 1.0 ± 0.1 1.2 ± 0.1 1.2 ± 0.1 1.6 ± 0.1 1.6 ± 0.1 2 ± 0.1 3 ± 0.15 3 ± 0.15 3.5 ± 0.20 3.5 ± 0.2
(M2.2) M2.5 M3.0 (M3.5)
0.2
0.23 0.25 0.25 0.25
0.7 ± 0.1 0.8 ± 0.1 0.8 ± 0.1 0.8 ± 0.1 0.9 ± 0.1 1 ± 0.1 1.2 ± 0.1 1.2 ± 0.1 1.6 ± 0.1 1.6 ± 0.1 2 ± 0.1 2 ± 0.1 2 ± 0.1
M4 M5 M6 M8
0.3
12.9 15.1 18.2 20.2 25.4 27.4 29.4 31.9 35.9 39.4 44.0 49.5 52.5 60.5 63.5 66.5 72.5 84.5 94.5
0.33
0.4 0.4 0.5 0.5
M10 M12
10.8 10.4 12.8 12.4 15.0 14.5 17.0 16.5 19.0 18.5 21.5 20.8 23.5 22.8 26.0 25.0 29.5 28.0 33.0 31.5 36.0 34.5 40.0 38.0 43.0 41.0 46.0 44.0 52.0 50.0 60.0 58.0
(M14) M16 (M18) M20 (M22) M24 (M27) M30 (M33) M36 (M39) M42
5 ± 0.2 5 ± 0.2 5 ± 0.2 5 ± 0.2
0.65 0.65 0.65
0.8 1.1 1.1 1.1 1.1 1.1 1.1 1.5 1.5 1.5
6 ± 0.2 6.5 ± 0.2 7 ± 0.25 8 ± 0.25 8 ± 0.25 10 ± 0.25 10 ± 0.25 10 ± 0.25 10 ± 0.25 12 ± 0.25 12 ± 0.25
2.5 ± 0.15 3.25 ± 0.15 3.25 ± 0.15 3.25 ± 0.15 3.25 ± 0.15 3.25 ± 0.15 3.25 ± 0.15 4.5 ± 0.2
M48 M56 M64
4.5 ± 0.2 4.5 ± 0.2 4.5 ± 0.2
70.0 67.0 1.5 All dimensions are given in millimeters. Sizes shown in parentheses are non-preferred, and are not usually stock sizes. The free height of double coil washers before compression is normally approximately five times the thickness but, if required, washers with other free heights may be obtained by arrangement with manufacturer.
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