材质 
1/4
20|28|32
0.439
0.43
0.488
0.328
0.298
0.225
5/16
18|24|32
0.502
0.489
0.557
0.359
0.329
0.25
3/8
16|24|32
0.564
0.551
0.628
0.468
0.438
0.335
7/16
14|20|28
0.627
0.616
0.698
0.468
0.438
0.324
1/2
13|20|28
0.752
0.736
0.84
0.609
0.579
0.464
9/16
12|18|24
0.877
0.861
0.982
0.656
0.626
0.469
5/8
11|18|24
0.94
0.922
1.051
0.765
0.735
0.593
3/4
10|16|20
1.064
1.052
1.191
0.89
0.86
0.742
7/8
9|14|20
1.252
1.239
1.403
0.999
0.969
0.79
1
8|12|20
1.44
1.427
1.619
1.078
1.016
0.825
1-1/8
7|12|18
1.627
1.614
1.833
1.203
1.141
0.93
1-1/4
7|12|18
1.815
1.801
2.046
1.422
1.36
1.125
1-3/8
6|12|18
2.008
1.973
2.259
1.609
1.547
1.282
1-1/2
6|12|18
2.197
2.159
2.473
1.64
1.578
1.313