材质 
1/4
20|28|32
0.488
0.5
0.64
0.707
0.218
0.266
5/16
18|24|32
0.546
0.562
0.72
0.795
0.28
0.33
3/8
16|24|32
0.669
0.688
0.889
0.973
0.341
0.393
7/16
14|20|28
0.728
0.75
0.97
1.06
0.403
0.456
1/2
13|20|28
0.85
0.875
1.137
1.237
0.464
0.52
5/8
11|18|24
1.031
1.062
1.386
1.503
0.587
0.647
3/4
10|16|20
1.212
1.25
1.635
1.768
0.71
0.774
7/8
9|14|20
1.394
1.438
1.884
2.033
0.833
0.901
1
8|12|20
1.575
1.625
2.132
2.298
0.956
1.028
1-1/8
7|12|18
1.756
1.812
2.381
2.563
1.079
1.155
1-1/4
7|12|18
1.938
2
2.631
2.828
1.187
1.282
1-3/8
6|12|18
2.119
2.188
2.879
3.094
1.31
1.409
1-1/2
6|12|18
2.3
2.375
3.128
3.359
1.433
1.536