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JIS B1251-5-2001
Type A toothed lock washers with internal teeth-Table 5
Nom
d max
d min
dc max
dc min
h max
h min
Number of teeth min
H
Φ2
2.4
2.2
4.8
4.5
0.325
0.275
7
0.6
Φ2.5
2.9
2.7
5.7
5.4
0.325
0.275
7
0.6
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
8
0.9
Φ4.5
5
4.8
9.5
9.1
0.535
0.465
8
1
Φ5
5.5
5.3
10
9.6
0.64
0.56
8
1.2
Φ6
6.7
6.4
11
10.5
0.64
0.56
9
1.2
Φ7
7.7
7.4
13
12.5
0.85
0.75
9
1.6
Φ8
8.7
8.4
15
14.5
0.85
0.75
9
1.6
Φ10
10.9
10.5
18
17.5
0.95
0.85
9
1.8
Φ12
12.9
12.5
21
20.4
1.055
0.945
10
2
Φ14
14.9
14.5
23
22.4
1.055
0.945
10
2
Φ16
16.9
16.5
26
25.4
1.265
1.135
12
2.4
Φ18
19.5
19
29
28.4
1.265
1.135
12
2.4
Φ20
21.5
21
32
31.2
1.47
1.33
12
2.8
Φ22
23.5
23
35
34.2
1.47
1.33
14
2.8
Φ24
25.5
25
38
37.2
1.68
1.52
14
3.2
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