材质 
#8
32|36
0.3438
0.332
0.246
#10
24|32
0.375
0.362
0.285
1/4
20|28|32
0.4375
0.4305
0.328
5/16
18|24|32
0.5
0.493
0.406
3/8
16|24|32
0.5625
0.5545
0.487
7/16
14|20|28
0.6875
0.6795
0.568
1/2
13|20|28
0.75
0.742
0.65
9/16
12|18|24
0.875
0.867
0.731
5/8
11|18|24
0.9375
0.9295
0.812
3/4
10|16|20
1.125
1.115
0.975
7/8
9|14|20
1.3125
1.3005
1.135
1
8|12|20
1.5
1.488
1.3
1-1/8
7|12|18
1.6875
1.6575
1.46
1-1/4
7|12|18
1.875
1.83
1.625
1-3/8
6|12|18
2.0625
2.0175
1.79
1-1/2
6|12|18
2.25
2.205
1.95