20° Pressure Angle O.D. = Outside Diameter P.D. = Pitch Diameter A = Bore (Nominal shaft hole A is for a tight press fit on given shaft size) A- 1/4" P.D.- 1.375" O.D.- 1.438" B- .437" C- 1.168" G- .437" E = 0.095" F = 0.185"