Roller Chain Sprocket Bore Diameter 5/8 in For Chain Pitch 3/8 in For Number of Strands Single Hub Type One Side Material Steel Maximum Bore Diameter 5/8 in Number of Teeth 27 Outside Diameter 3.43 in Pitch Diameter 3.23 in Bore Type Fixed Chain Number 35 Finish Black Oxide Hub Diameter 2 in Hub Projection 0.707 in Includes Set Screws Keyway Yes Keyway Width 3/16 in Length through Bore 7/8 in Number of Set Screws 2