A B 2.5 3 3.5 4 4.5 5 6 7 8 9 10 12
15 1/2" 21.3 18 0.956 1.11 1.25 1.38 1.5 1.6
20 3/4" 26.9 25 1.39 1.63 1.86 2.07 2.28 2.47 2.81 3.11 -
25 1" 33.7 32 1.76 2.15 2.46 2.76 3.05 3.33 3.85 4.32 4.47 -
32 1 1/4" 42.4 38 2.19 2.59 2.98 3.35 3.72 4.07 4.74 5.35 5.95 -
40 1 1/2" 48.3 45 2.62 3.11 3.58 4.04 4.49 4.93 5.77 6.56 7.3 7.99 -
50 2" 60.3 57 3.36 4 4.62 5.23 5.83 6.41 7.55 8.63 9.67 10