材质 
1/4
20|28|32
0.425
0.438
0.554
0.619
0.203
0.235
5/16
18|24|32
0.547
0.562
0.721
0.795
0.249
0.283
3/8
16|24|32
0.606
0.625
0.802
0.884
0.31
0.346
7/16
14|20|28
0.728
0.75
0.97
1.061
0.356
0.394
1/2
13|20|28
0.788
0.812
1.052
1.149
0.418
0.458
5/8
11|18|24
0.969
1
1.3
1.414
0.525
0.569
3/4
10|16|20
1.088
1.125
1.464
1.591
0.632
0.68
7/8
9|14|20
1.269
1.312
1.712
1.856
0.74
0.792
1
8|12|20
1.45
1.5
1.961
2.121
0.847
0.903
1-1/8
7|12|18
1.631
1.688
2.209
2.386
0.97
1.03
1-1/4
7|12|18
1.812
1.875
2.458
2.652
1.062
1.126
1-3/8
6|12|18
1.994
2.062
2.708
2.917
1.169
1.237
1-1/2
6|12|18
2.175
2.25
2.956
3.182
1.276
1.348