材质 
M14
2
23.36
14
21
20.67
2
0.42
M16
2
26.75
16
24
23.67
2.5
0.42
M18
2.5
29.56
17.5
27
26.16
2.5
0.5
M20
2.5
32.95
18
30
29.16
2.5
0.5
M22
2.5
37.29
19.1
34
33
3
0.5
M24
3
39.55
21.5
36
35
3
0.6
M27
3
45.2
22.5
41
40
3.5
0.6
M30
3.5
50.85
25
46
45
3.5
0.7