材质 
M16
2
29.3
16.4
15.7
27
26.16
M20
2.5
36.96
20.4
19.1
34
33
M24
3
44.8
24.4
23.1
41
40
M27
3
50.4
27.4
26.1
46
45
M30
3.5
54.88
30.4
28.8
50
49
M36
3
65.86
36.5
34.9
60
58.8
M42
3
70.67
42.5
40.9
65
63.1
M48
3
81.87
48.5
46.9
75
73.1