材质 
1/4
20|28|32
0.448
0.5
0.556
0.577
0.218
0.25
5/16
18|24|32
0.546
0.562
0.622
0.65
0.28
0.314
3/8
16|24|32
0.669
0.688
0.763
0.794
0.341
0.377
7/16
14|20|28
0.728
0.75
0.83
0.866
0.403
0.441
1/2
13|20|28
0.85
0.875
0.969
1.01
0.464
0.504
9/16
12|18|24
0.909
0.938
1.037
1.083
0.526
0.568
5/8
11|18|24
1.031
1.062
1.175
1.227
0.587
0.631
3/4
10|16|20
1.212
1.25
1.382
1.443
0.71
0.758
7/8
9|14|20
1.394
1.438
1.589
1.66
0.833
0.885
1
8|12|20
1.575
1.625
1.796
1.876
0.956
1.012
1-1/8
7|12|18
1.756
1.812
2.002
2.093
1.079
1.138
1-1/4
7|12|18
1.938
2
2.209
2.309
1.187
1.251
1-3/8
6|12|18
2.119
2.188
2.416
2.526
1.31
1.378
1-1/2
6|12|18
2.3
2.375
2.622
2.742
1.433
1.505
1-5/8
6|12|18
2.481
2.562
2.828
2.959
1.556
1.632
1-3/4
5|8|12
2.662
2.75
3.035
3.175
1.679
1.759
1-7/8
6
2.844
2.938
3.242
3.392
1.802
1.886
2
4.5
3.025
3.125
3.449
3.608
1.925
2.013
2-1/4
4.5
3.388
3.5
3.862
4.041
2.155
2.251
2-1/2
4
3.75
3.875
4.275
4.474
2.401
2.505
2-3/4
4
4.112
4.25
4.688
4.907
2.647
2.759
3
4
4.475
4.625
5.102
5.34
2.893
3.013
3-1/4
4
4.838
5
5.515
5.774
3.124
3.252
3-1/2
4
5.2
5.375
5.928
6.207
3.37
3.506
3-3/4
4
5.562
5.75
6.341
6.64
3.616
3.76
4
4
5.925
6.125
6.755
7.073
3.862
4.014