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ISO 4320 Plain Washer

Engineering ANSI Hardware Design Data
Engineering Metric Hardware Design Data

ISO BS EN DIN 4320 Plain Washer, Bright Metric Series

ISO BS EN DIN 4320 Plain Washer, Bright Metric Series

All dimensions in mm.

Designation
(thread diameter)a
Internal
diameter
d1
External
diameter
d2
Thickness s
max.
min.
max.
min.
Thick
(normal)
Thin
max.
min.
max.
min.
M1.0
1.25
1.1
2.5
2.3
0.4
0.2
M1.2
1.45
1.3
3.0
2.8
0.4
0.2
(M1.4)
1.65
1.5
3.0
2.8
0.4
0.2
M1.6
1.85
1.7
4.0
3.7
0.4
0.2
M2.0
2.35
2.2
5.0
4.7
0.4
0.2
(M2.2)
2.55
2.4
5.0
4.7
0.6
0.4
M2.5
2.85
2.7
6.5
6.2
0.6
0.4
M3
3.4
3.2
7.0
6.7
0.6
0.4
(M3.5)
3.9
3.7
7.0
6.7
0.6
0.4
M4
4.5
4.3
9.0
8.7
0.9
0.7
(M4.5)
5.0
4.8
9.0
8.7
0.9
0.7
M5
5.5
5.3
10.0
9.7
1.1
0.9
M6
6.7
6.4
12.5
12.1
1.8
1.4
0.9
0.7
(M7)
7.7
7.4
14.0
13.6
1.8
1.4
0.9
0.7
M8
8.7
8.4
17.0
16.6
1.8
1.4
1.1
0.9
M10
10.9
10.5
21.0
20.5
2.2
1.8
1.45
1.05
M12
13.4
13.0
24.0
23.5
2.7
2.3
1.8
1.4
(M14)
15.4
15.0
28.0
27.5
2.7
2.3
1.8
1.4
M16
17.4
17.0
30.0
29.5
3.3
2.7
2.2
1.8
(M18)
19.5
19.0
34.0
33.2
3.3
2.7
2.2
1.8
M20
21.5
21.0
37.0
36.2
3.3
2.7
2.2
1.8
(M22)
23.5
23.0
39.0
38.2
3.3
2.7
2.2
1.8
M24
25.5
25.0
44.0
43.2
4.3
3.7
2.7
2.3
(M27)
28.5
28.0
50.0
49.2
4.3
3.7
2.7
2.3
M30
31.6
31.0
56.0
55.0
4.3
3.7
2.7
2.3
(M33)
34.6
34.0
60.0
59.0
5.6
4.4
3.3
2.7
M36
37.6
37.0
66.0
65.0
5.6
4.4
3.3
2.7
(M39)
40.6
40.0
72.0
71.0
6.6
5.4
3.3
2.7
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