Roller Chain 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 5/8 in Number of Teeth 18 Outside Diameter 3.14 in Pitch Diameter 2.879 in Bore Type Plain Chain Number 41 Finish Black Oxide Hub Diameter 2 3/8 in Hub Projection 0.773 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