Spur Gear Bore Diameter 5/8 in Hub Diameter 2.15 in Hub Projection 0.63 in Face Width 3/4 in Pitch Diameter 2.5 in Material Steel Pressure Angle 14.5 Degrees Compatible Gear Rack Grainger Part Number 1L901 1L902 Compatible Gear Rack Manufacturer Part Number L514-6 L515-6 Diametral Pitch 12 Keyway No