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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.
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
|