Spur Gear Bore Diameter 3/8 in Hub Diameter 0.56 in Hub Projection 0.44 in Face Width 1/2 in Pitch Diameter 0.75 in Material Steel Pressure Angle 14.5 Degrees Compatible Gear Rack Grainger Part Number 1L900 Compatible Gear Rack Manufacturer Part Number L512-6 Diametral Pitch 16 Keyway No