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 5/8 in Number of Teeth 17 Outside Diameter 2.97 in Pitch Diameter 2.721 in Bore Type Fixed Chain Number 41 Finish Black Oxide Hub Diameter 2 1/4 in Hub Projection 0.773 in Includes Set Screws Keyway Yes Keyway Width 3/16 in Length through Bore 1 in Number of Set Screws 2