材质 
1/4
28|32
0.287
0.255
0.245
0.365
0.375
5/16
18|24|32
0.362
0.323
0.313
0.457
0.469
3/8
16|24|32
0.431
0.394
0.384
0.55
0.562
7/16
14|20|28
0.499
0.472
0.462
0.642
0.656
1/2
13|20|28
0.571
0.515
0.505
0.735
0.75
9/16
12|18|24
0.645
0.551
0.541
0.828
0.844
5/8
11|18|24
0.715
0.63
0.62
0.921
0.938
3/4
10|16|20
0.86
0.787
0.777
1.107
1.125
7/8
9|14|20
1
0.866
0.856
1.293
1.312
1
8|12|20
1.138
1.063
1.053
1.479
1.5
1-1/8
7|12|18
1.28
1.181
1.171
1.665
1.688
1-1/4
7|12|18
1.42
1.299
1.289
1.852
1.875
1-3/8
6|12|18
1.562
1.417
1.407
2.038
2.062