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JIS B1251-5-2001
Type B toothed lock washers with external teeth-Table 5
Nom
d max
d min
dc max
dc min
h max
h min
Number of teeth min
H
Φ3
3.4
3.2
6.5
6.1
0.485
0.415
8
0.9
Φ3.5
3.9
3.7
7.5
7.1
0.485
0.415
8
0.9
Φ4
4.5
4.3
8.5
8.1
0.485
0.415
9
0.9
Φ4.5
5
4.8
9.5
9.1
0.535
0.465
9
1
Φ5
5.5
5.3
10
9.6
0.64
0.56
10
1.2
Φ6
6.7
6.4
11
10.5
0.64
0.56
12
1.2
Φ7
7.7
7.4
13
12.5
0.85
0.75
12
1.6
Φ8
8.7
8.4
15
14.5
0.85
0.75
12
1.6
Φ10
10.9
10.5
18
17.5
0.95
0.85
12
1.8
Φ12
12.9
12.5
21
20.4
1.055
0.945
12
2
Φ14
14.9
14.5
23
22.4
1.055
0.945
12
2
Φ16
16.9
16.5
26
25.4
1.265
1.135
14
2.4
Φ18
19.5
19
29
28.4
1.265
1.135
14
2.4
Φ20
21.5
21
32
31.2
1.47
1.33
14
2.8
Φ22
23.5
23
35
34.2
1.47
1.33
16
2.8
Φ24
25.5
25
38
37.2
1.68
1.52
16
3.2
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