Machinery's Handbook, 31st Edition
1770
Washers British Standard Single Coil Rectangular Section Spring Washers Metric Series.—Types B and BP BS 4464:1969 (2004)
A
60° min.
b
d 1
d 2
d 2
k Detail at A Broken line is shown for flat end spring washer
r
r
X
X
s
h 2 s
r
r
h 1 h 1 = (2s + 2k) ± 15%
h 2 = 2s ± 15%
Section X X
Type BP Type B
Nom. Size &Thread Dia., d
Radius, r Max.
k (Type BP Only)
Inside Dia., d 1
Outside Dia., d 2 Max.
Width, b
Thickness, s 0.4 ± 0.1 0.5 ± 0.1 0.6 ± 0.1 0.6 ± 0.1 0.8 ± 0.1 0.8 ± 0.1 0.9 ± 0.1 1.2 ± 0.1 1.6 ± 0.1 2.2 ± 0.15 2.5 ± 0.15 2 ± 0.1
Max.
Min.
M1.6
1.9 2.3 2.5 2.8 3.3 3.8
1.7 2.1 2.3 2.6 3.1 3.6 4.1 5.1 6.1 8.2
3.5 4.3 4.7 5.0 6.1 6.6
0.15 0.15
… … … … …
0.7 ± 0.1 0.9 ± 0.1 1.0 ± 0.1 1.0 ± 0.1 1.3 ± 0.1 1.3 ± 0.1 1.5 ± 0.1 1.8 ± 0.1 2.5 ± 0.15 3 ± 0.15 3.5 ± 0.2
M2
(M2.2)
0.2 0.2
M2.5
M3
0.25 0.25 0.3 0.4 0.5 0.7 0.8 1.0 0.65 1.15 1.15
(M3.5)
0.15 0.15 0.15
M4 M5 M6 M8
4.35 5.35
7.55 9.15
6.4
11.7
0.2 0.3 0.3 0.4 0.4 0.4 0.4 0.4 0.4 0.5 0.5 0.8 0.8 0.8 0.8 0.8 0.8 0.8 1.0 1.0 1.0 1.0
8.55
14.85
M10 M12
10.6 12.6 14.7 16.9 19.0 21.1 23.3 25.3 28.5 31.5 34.6 37.6 40.8 43.8 46.8 50.0 54.1 58.1 62.3 66.3 70.5
10.2 12.2 14.2 16.3 18.3 20.3 22.4 24.4 27.5 30.5 33.5 36.5 39.6 42.6 45.6 48.8 52.8 56.8 60.9 64.9 69.0
18.0 21.0 24.1 27.3 29.4 33.5 35.7 39.8 43.0 48.0 55.1 58.1 61.3 68.3 71.3 74.5 82.6 86.6 90.8 93.8 99.0
4 ± 0.2
(M14)
4.5 ± 0.2
3 ± 0.15
M16
5 ± 0.2 5 ± 0.2 6 ± 0.2 6 ± 0.2
3.5 ± 0.2 3.5 ± 0.2
(M18)
M20
1.3 1.3
4 ± 0.2 4 ± 0.2 5 ± 0.2 5 ± 0.2 6 ± 0.25 6 ± 0.25 6 ± 0.25 6 ± 0.25 7 ± 0.25 7 ± 0.25 7 ± 0.25 8 ± 0.25 8 ± 0.25 8 ± 0.25 8 ± 0.25 8 ± 0.25
(M22)
M24
1.65 1.65
7 ± 0.25 7 ± 0.25 8 ± 0.25 10 ± 0.25 10 ± 0.25 10 ± 0.25 12 ± 0.25 12 ± 0.25 12 ± 0.25 14 ± 0.25 14 ± 0.25 14 ± 0.25 14 ± 0.25 14 ± 0.25
(M27)
M30
2.0 2.0 2.0 2.0 2.3 2.3 2.3
(M33)
M36
(M39)
M42
(M45)
M48
(M52)
2.65 2.65 2.65 2.65 2.65
M56
(M60)
M64
(M68) 1.0 All dimensions are given in millimeters. Sizes shown in parentheses are non-preferred, and are not usually stock sizes.
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