材质 
1/4
20
0.438
0.425
0.619
0.584
0.235
0.203
5/16
18
0.563
0.547
0.795
0.751
0.283
0.249
3/8
16
0.625
0.606
0.884
0.832
0.346
0.310
7/16
14
0.750
0.728
1.061
1.000
0.394
0.356
1/2
13
0.813
0.788
1.149
1.082
0.458
0.418
5/8
11
1.000
0.969
1.414
1.330
0.569
0.525
3/4
10
1.125
1.088
1.591
1.494
0.680
0.632
7/8
9
1.313
1.269
1.856
1.742
0.792
0.740
1
8
1.500
1.450
2.121
1.991
0.903
0.847
1-1/8
7
1.688
1.631
2.386
2.239
1.030
0.970
1-1/4
7
1.875
1.812
2.652
2.489
1.126
1.062
1-3/8
6
2.063
1.994
2.917
2.738
1.237
1.169
1-1/2
6
2.250
2.175
3.182
2.986
1.348
1.276