材质 
M12
1.75
12.7
11.3
23.91
7.95
7.05
22
21.16
16
8
7.4
8.36
M16
2
16.7
15.3
29.56
10.75
9.25
27
26.16
18
11.6
11
12.43
M20
2.5
20.84
19.16
35.03
13.4
11.6
32
31
20
14.4
13.8
15.6
M22
2.5
22.84
21.16
39.55
14.9
13.1
36
35
21
15.7
15.1
17.06
M24
3
24.84
23.16
45.2
15.9
14.1
41
40
21.5
17.1
16.5
18.65
M27
3
27.84
26.16
50.85
17.9
16.1
46
45
24
19.3
18.7
21.13
M30
3.5
30.84
29.16
55.37
19.75
17.65
50
49
26
21.4
20.8
23.5