Chain Sprocket Parameter Calculation Formula:

Diameter of pitch circle: d = p / sin(180°/z) p = pitch, consult table z = number of teeth

Top Circle Diameter (Outer Diameter): D = p × (0.54 + cot(180°/z))

Standard Sprocket Pitch:

3/8=9.525 1/2=12.7 5/8=15.875 3/4=19.05

3rd, 4th, 5th, 6th

Diameter of the pitch circle: d = p / sin(180°/z)

Diameter of pitch circle: dmax = d + 1.25p - d1

dmin=d+(1-1.6/z)p-d1

Root Diameter: df = d - d1