材质 
1/4
20|28|32
0.224
0.214
0.4375
0.4305
5/16
18|24|32
0.271
0.261
0.5
0.493
3/8
16|24|32
0.333
0.323
0.5625
0.5545
7/16
14|20|28
0.38
0.37
0.6875
0.6795
1/2
13|20|28
0.442
0.432
0.75
0.742
9/16
12|18|24
0.489
0.479
0.875
0.867
5/8
11|18|24
0.552
0.542
0.9375
0.9295
3/4
10|16|20
0.651
0.631
1.125
1.115
7/8
9|14|20
0.76
0.74
1.3125
1.3005
1
8|12|20
0.874
0.844
1.5
1.448
1-1/8
7|12|18
0.989
0.949
1.6875
1.6575
1-1/4
7|12|18
1.087
1.037
1.875
1.83
1-3/8
6|12|18
1.197
1.147
2.0625
2.0175
1-1/2
6|12|18
1.311
1.251
2.25
2.205
1-3/4
5|8|12
1.53
1.47
2.625
2.565
2
4.5
1.754
1.684
3
2.94