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Double Coil Rectangular Section Spring Washer

Engineering ANSI Hardware Design Data
Engineering Metric Hardware Design Data

BS 4464 Double Coil Rectangular Section Spring Washer: Metric Series, Type D

a Sizes shown in brackets are non-preferred, and are not usually stock sizes. Note: 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 between the purchaser and the manufacturer.

BS 4464 Double Coil Rectuangula Section Spring Washer: Metric Series, Type D

Nominal size
and
thread
diametera
d
Inside
diameter
d1
Width
b
Thickness
s
Outside
diameter
d2
max.
Radius
r
max.
max.
min.
M2
2.4
2.1
0.9 ±0.1
0.5 ±0.05
4.4
0.15
(M2.2)
2.6
2.3
1.0 ±0.1
0.6 ±0.05
4.8
0.2
M2.5
2.9
2.6
1.2 ±0.1
0.7 ±0.1
5.5
0.23
M3.0
3.6
3.3
1.2 ±0.1
0.8 ±0.1
6.2
0.25
(M3.5)
4.1
3.8
1.6 ±0.1
0.8 ±0.1
7.5
0.25
M4
4.6
4.3
1.6 ±0.1
0.8 ±0.1
8.0
0.25
M5
5.6
5.3
2 ±0.1
0.9 ±0.1
9.8
0.3
M6
6.6
6.3
3 ±0.15
1 ±0.1
12.9
0.33
M8
8.8
8.4
3 ±0.15
1.2 ±0.1
15.1
0.4
M10
10.8
10.4
3.5 ±0.20
1.2 ±0.1
18.2
0.4
M12
12.8
12.4
3.5 ±0.2
1.6 ±0.1
20.2
0.5
(M14)
15.0
14.5
5 ±0.2
1.6 ±0.1
25.4
0.5
M16
17.0
16.5
5 ±0.2
2 ±0.1
27.4
0.65
(M18)
19.0
18.5
5 ±0.2
2 ±0.1
29.4
0.65
M20
21.5
20.8
5 ±0.2
2 ±0.1
31.9
0.65
(M22)
23.5
22.8
6 ±0.2
2.5 ±0.15
35.9
0.8
M24
26.0
25.0
6.5 ±0.2
3.25 ±0.15
39.4
1.1
(M27)
29.5
28.0
7 ±0.25
3.25 ±0.15
44.0
1.1
M30
33.0
31.5
8 ±0.25
3.25 ±0.15
49.5
1.1
(M33)
36.0
34.5
8 ±0.25
3.25 ±0.15
52.5
1.1
M36
40.0
38.0
10 ±0.25
3.25 ±0.15
60.5
1.1
(M39)
43.0
41.0
10 ±0.25
3.25 ±0.15
63.5
1.1
M42
46.0
44.0
10 ±0.25
4.5 ±0.2
66.5
1.5
M48
52.0
50.0
10 ±0.25
4.5 ±0.2
72.5
1.5
M56
60.0
58.0
12 ±0.25
4.5 ±0.2
84.5
1.5
M64
70.0
67.0
12 ±0.25
4.5 ±0.2
94.5
1.5
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