Related Resources: hardware
BS 4464 Split Coil Washer
Engineering ANSI Hardware Design Data
Engineering Metric Hardware Design Data
BS 4464 Split Coil Washer Spring Metric Series Type A
All dimensions in mm.
a Sizes shown in brackets are non-preferred and are not usually stock sizes
Nominal size
and thread diametera d |
Inside
diameter d1 |
Thickness
and width s |
Outside
diameter d2 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
|