材质 
5/16
18
0.605
0.538
0.312
0.299
0.417
0.269
0.228
0.325
0.313
3/8
16
0.708
0.624
0.375
0.36
0.491
0.312
0.262
0.387
0.375
7/16
14
0.826
0.729
0.438
0.421
0.58
0.364
0.306
0.45
0.438
1/2
13
0.945
0.831
0.5
0.483
0.668
0.417
0.349
0.515
0.5
9/16
12
1.045
0.924
0.592
0.544
0.732
0.461
0.389
0.578
0.563
5/8
11
1.147
1.013
0.657
0.606
0.819
0.506
0.426
0.64
0.625
3/4
10
1.303
1.169
0.782
0.729
0.996
0.541
0.461
0.765
0.75
7/8
9
1.512
1.344
0.938
0.853
1.16
0.626
0.526
0.906
0.875
1
8
1.7
1.532
1.062
0.976
1.336
0.69
0.59
1.031
1