材质 
M4
0.7
6.5
7.66
9.9
9.3
2.9
7
6.78
0.5
M5
0.8
7.5
8.79
10.85
10.15
4.4
8
7.78
0.5
M6
1
9.5
11.05
12.35
11.65
4.9
10
9.78
0.8
M8
1.25
12.5
14.38
14.35
13.65
6.44
13
12.73
0.8
M10
1.5
16
17.77
18.5
17.7
8.04
16
15.73
0.8
M12
1.75
18
20.03
22.9
22.1
10.37
18
17.73
1
M14
2
21
23.35
26.8
26
12.1
21
20.67
1
M16
2
23
26.75
27.9
27.1
14.1
24
23.67
1
M20
2.5
28
32.95
35.5
34.5
16.9
30
29.16
1.2