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JIS B1188-2-1995
Cross recessed countersunk head screw and toothed lock washer assemblies-Table 2
Nom
P
dk max
dk min
k max
k min
No.
M
t max
t min
dc
d1 max
h max
h min
Number of teeth min
M3
0.5
6
5.5
1.75
1.45
2
3.6
1.43
0.91
6
2.85
0.43
0.37
8
M3.5
0.6
7
6.5
2
1.7
2
4.1
1.93
1.4
7
3.32
0.43
0.37
8
M4
0.7
8
7.5
2.3
2
2
4.5
2.33
1.79
8
3.72
0.43
0.37
8
M5
0.8
10
9.4
2.8
2.5
2
5.1
2.93
2.38
10
4.67
0.535
0.465
9
M6
1
12
11.3
3.4
3
3
6.7
3.26
2.7
12
5.62
0.535
0.465
10
M8
1.25
16
15.2
4.4
4
3
8.4
4.96
4.36
16
7.55
0.64
0.56
12
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