Spur Gear Bore Diameter 5/16 in Hub Diameter 0.46 in Hub Projection 0.38 in Face Width 3/8 in Pitch Diameter 0.6 in Material Steel Pressure Angle 14.5 Degrees Compatible Gear Rack Grainger Part Number 1L899 Compatible Gear Rack Manufacturer Part Number L509-6 Diametral Pitch 20 Keyway No