Pitch in Inches   Inches to 45 degree station 
20 3.18
21 3.34
22 3.50
23 3.66
24 3.82
25 3.98
26 4.14
27 4.30
28 4.46
29 4.62
30 4.77
31 4.93
32 5.09
33 5.25
34 5.41
35 5.57
36 5.73