材质 
1/2
0.350
0.8
0.250
9/16
0.394
0.9
0.281
5/8
0.438
1.0
0.313
11/16
0.481
1.1
0.344
3/4
0.525
1.2
0.375
13/16
0.569
1.3
0.406
7/8
0.613
1.4
0.438
15/16
0.656
1.5
0.469
1
0.700
1.6
0.500
1-1/16
0.744
1.7
0.531
1-1/8
0.788
1.8
0.563
1-3/16
0.831
1.9
0.594
1-1/4
0.875
2.0
0.625
1-5/16
0.919
2.1
0.656
1-3/8
0.963
2.2
0.688
1-7/16
1.006
2.3
0.719
1-1/2
1.050
2.4
0.750
1-9/16
1.094
2.5
0.781
1-5/8
1.138
2.6
0.813
1-3/4
1.225
2.8
0.875