Spur Gear Bore Diameter 3/8 in Hub Diameter 0.87 in Hub Projection 0.38 in Face Width 1/4 in Pitch Diameter 1 in Material Steel Pressure Angle 14.5 Degrees Compatible Gear Rack Grainger Part Number 1L887 Compatible Gear Rack Manufacturer Part Number L505-4 Diametral Pitch 24 Keyway No