Geometry factors, I, for straight bevel gears. Pressure angle = 20 degrees, shaft angle = 90 degrees. (From AGMA Information Sheet 215.91).

Number of teeth in pinion

Number of teeth in gear.

Geometry factors, I, for spiral bevel gears. Pressure angle = 20 degrees, spiral angle = 35 degrees, shaft angle = 90 degrees.

(From AGMA Information Sheet 215.91)

Number of teeth in pinion

Number of teeth in gear.