材质 
M10
1.5
14
19
5
6
0.5
10
9.03
M12
1.75
18
24
7
8
0.5
12
10.86
M16
2
22
30
8
10
1
16
14.70
M20
2.5
30
38
10
12.5
1
20
18.38
M22
2.5
33
42
12
14
1
22
20.38