Spur Gear Bore Diameter 1/2 in Hub Diameter 0.81 in Hub Projection 0.44 in Face Width 1/2 in Pitch Diameter 1 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