材质 
M12
1.75
13
12.89
19.85
8.45
7.55
18
17.57
0.6
M16
2
17
16.89
26.17
10.75
9.25
24
23.16
0.6
M20
2.5
21
20.87
32.95
13.9
12.1
30
29.16
0.8
M22
2.5
23
22.87
35.03
14.9
13.1
32
31
0.8
M24
3
25
24.87
39.55
15.9
14.1
36
35
0.8
M27
3
28
27.87
45.2
17.9
16.1
41
40
1
M30
3.5
31
30.84
50.85
20.05
17.95
46
45
1