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Washer Standards


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Nominal Bolt Size
Inside Diameter
Outside Diameter
Thickness
Min
Max
Min
Max
Nom
Min
Max
M5
5.5
5.8
12.0
12.7
1.4
1.2
1.6
M6
6.7
7.1
16.0
17.0
1.4
1.2
1.6
M8
8.8
9.3
19.0
20.0
1.6
1.4
1.8
M10
10.5
11.0
22.5
23.5
2.0
1.8
2.2
7/16"
12.0
12.7
25.4
26.5
2.0
1.8
2.2
M12
13.2
14.0
27.5
28.5
2.25
2.0
2.5
M16
17.2
18.0
33.5
34.5
2.75
2.5
3.0
M20
21.0
22.0
38.0
39.5
3.0
2.6
3.2
7/8"
23.5
24.5
46.5
48.0
3.0
2.8
3.5
M24
26.0
27.0
52.0
54.2
4.0
3.5
4.2
1 1/8"
31.0
32.5
62.0
64.0
4.0
3.5
4.2
M30
33.0
34.5
58.0
60.0
4.0
3.5
4.2
1 1/4"
35.0
36.5
68.0
66.0
4.0
3.5
4.2
M36
39.0
40.5
70.0
73.0
5.0
4.5
5.2
1 1/2"
41.0
43.0
77.0
80.0
5.0
4.8
5.5
M42
45.0
46.0
77.0
80.0
5.0
4.8
5.2
1 3/4"
48.0
51.0
90.0
93.0
6.0
5.6
6.4
M48
51.0
53.5
90.0
93.0
6.0
5.6
6.4
2"
54.0
55.0
100.0
105.0
6.0
5.6
6.4
M56
61.5
63.0
118.0
125.0
7.0
6.6
7.4
M64
69.5
71.0
118.0
125.0
7.0
6.6
7.4

Bremick Fasteners
Information provided as a guide by Bremick Fasteners

 
 

 
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