1/4
20
0.25
0.2435
0.25
0.1250
5/16
18
0.3125
0.3053
0.3125
0.1563
3/8
16
0.375
0.3678
0.375
0.1875
7/16
14
0.4375
0.4294
0.4375
0.2188
1/2
13
0.5
0.4919
0.5
0.2500
9/16
12
0.5625
0.5538
0.5625
0.2813
5/8
11
0.625
0.6163
0.625
0.3125
3/4
10
0.75
0.7406
0.75
0.3750
7/8
9
0.875
0.8647
0.875
0.4375
1
8
1
0.9886
1
0.5000
1-1/8
7
1.125
1.1136
1.125
0.5625
1-1/4
7
1.25
1.2386
1.25
0.6250
1-3/8
6
1.375
1.3636
1.375
0.6875
1-1/2
6
1.5
1.4886
1.5
0.7500