Sprocket, Bore Diameter 5/8 in, For Chain Pitch 1/2 in, For Number of Strands Single, Hub Type One Side, Material Steel, Maximum Bore Diameter 1 7/8 in, Number of Teeth 20, Outside Diameter 3.46 in, Pitch Diameter 3.196 in, Bore Type Plain, Chain Number 40, Finish Black Oxide, Hub Diameter 2 5/8 in, Hub Projection 0.716 in, Keyway No, Keyway Depth Not Applicable, Keyway Width Not Applicable, Length through Bore 1 in, Number of Set Screws 0, Set Screw Location Not Applicable