Sprocket Bore Diameter 1/2 in For Chain Pitch 1/2 in For Number of Strands Single Hub Type One Side Material Steel Maximum Bore Diameter 3/4 in Number of Teeth 10 Outside Diameter 1.84 in Pitch Diameter 1.618 in Bore Type Plain Chain Number 40 Finish Black Oxide Hub Diameter 1 1/4 in Hub Projection 0.591 in Keyway No Keyway Depth Not Applicable Keyway Width Not Applicable Length through Bore 7/8 in Number of Set Screws 0 Set Screw Location Not Applicable