材质 
1/4
26
0.228
0.2251
0.375
0.1250
5/16
22
0.2863
0.2832
0.46875
0.1563
3/8
20
0.3461
0.3429
0.5625
0.1875
7/16
18
0.4053
0.4019
0.65625
0.2188
1/2
16
0.4637
0.46
0.75
0.2500
9/16
16
0.5263
0.5225
0.84375
0.2813
5/8
14
0.5833
0.5793
0.9375
0.3125
3/4
12
0.7009
0.6966
1.125
0.3750
7/8
11
0.8214
0.8168
1.3125
0.4375
1
10
0.9411
0.936
1.5
0.5000
1-1/8
9
1.0592
1.0539
1.6875
0.5625
1-1/4
9
1.1844
1.1789
1.875
0.6250
1-3/8
8
1.3006
1.295
2.0625
0.6875
1-1/2
8
1.4258
1.42
2.25
0.7500