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BS 4464 Rectangular Spring Washer

Engineering ANSI Hardware Design Data
Engineering Metric Hardware Design Data

BS 4464, Single Coil Rectangular Spring Washer, Metric Series Types B and BP

BS 4464 Type B

BS 4464 Type B

BS 4464 Type BP

BS 4464 Type BP

 

Dimensions in mm

 

Nominal size
and
thread
diametera
d
Inside
diameter
d1
Width
b
Thickness
s
Outside
diameter
d2 max.
Radius
r
max.
k
(type BP only)
max.
min.
M1.6
1.9
1.7
0.7 0.1
0.4 ±0.1
3.5
0.15
M2
2.3
2.1
0.9 0.1
0.5 ±0.1
4.3
0.15
(M2.2)
2.5
2.3
1.0 0.1
0.6 ±0.1
4.7
0.2
M2.5
2.8
2.6
1.0 0.1
0.6 ±0.1
5.0
0.2
M3
3.3
3.1
1.3 0.1
0.8 ±0.1
6.1
0.25
(M3.5)
3.8
3.6
1.3 0.1
0.8 ±0.1
6.6
0.25
0.15
M4
4.35
4.1
1.5 0.1
0.9 ±0.1
7.55
0.3
0.15
M5
5.35
5.1
1.8 0.1
1.2 ±0.1
9.15
0.4
0.15
M6
6.4
6.1
2.5 0.15
1.6 ±0.1
11.7
0.5
0.2
M8
8.55
8.2
3 0.15
2 ±0.1
14.85
0.65
0.3
M10
10.6
10.2
3.5 0.2
2.2 ±0.15
18.0
0.7
0.3
M12
12.6
12.2
4 0.2
2.5 ±0.15
21.0
0.8
0.4
(M14)
14.7
14.2
4.5 0.2
3 ±0.15
24.1
1.0
0.4
M16
16.9
16.3
5 0.2
3.5 ±0.2
27.3
1.15
0.4
(M18)
19.0
18.3
5 0.2
3.5 ±0.2
29.4
1.15
0.4
M20
21.1
20.3
6 0.2
4 ±0.2
33.5
1.3
0.4
(M22)
23.3
22.4
6 0.2
4 ±0.2
35.7
1.3
0.4
M24
25.3
24.4
7 0.25
5 ±0.2
39.8
1.65
0.5
(M27)
28.5
27.5
7 0.25
5 ±0.2
43.0
1.65
0.5
M30
31.5
30.5
8 0.25
6 ±0.25
48.0
2.0
0.8
(M33)
34.6
33.5
10 0.25
6 ±0.25
55.1
2.0
0.8
M36
37.6
36.5
10 0.25
6 ±0.25
58.1
2.0
0.8
(M39)
40.8
39.6
10 0.25
6 ±0.25
61.3
2.0
0.8
M42
43.8
42.6
12 0.25
7 ±0.25
68.3
2.3
0.8
(M45)
46.8
45.6
12 0.25
7 ±0.25
71.3
2.3
0.8
M48
50.0
48.8
12 0.25
7 ±0.25
74.5
2.3
0.8
(M52)
54.1
52.8
14 0.25
8 ±0.25
82.6
2.65
1.0
M56
58.1
56.8
14 0.25
8 ±0.25
86.6
2.65
1.0
(M60)
62.3
60.9
14 0.25
8 ±0.25
90.8
2.65
1.0
M64
66.3
64.9
14 0.25
8 ±0.25
93.8
2.65
1.0
(M68)
70.5
69.0
14 0.25
8 ±0.25
99.0
2.65
1.0

a Sizes shown in brackets are non-preferred, and are not usually stock sizes.

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