材质 
M6
1
6.8
13.6
6
5.82
8.71
6.9
5
8
7.78
M8
1.25
9.2
17
8
7.78
10.95
8.5
6.25
10
9.78
M10
1.5
11.2
20.8
10
9.78
14.26
9.7
7.5
13
12.73
M12
1.75
13.7
24.7
12
11.73
16.5
12.1
8.75
15
14.73