材质 
3/16
24
1.5
1
0.473
0.433
0.2925
0.3325
7/32
32
1.5625
1.0625
0.555
0.515
0.355
0.395
1/4
20
1.75
1.25
0.671
0.631
0.441
0.467
5/16
18
2.25
1.75
0.792
0.752
0.501
0.526
3/8
16
2.5
2
0.976
0.936
0.605
0.645
1/2
13
3.25
2.75
1.465
1.425
0.98
1.02