Roller Chain Sprocket Bore Diameter 1 1/4 in For Chain Pitch 3/8 in For Number of Strands Single Hub Type One Side Material Steel Maximum Bore Diameter 1 1/4 in Number of Teeth 30 Outside Diameter 3.79 in Pitch Diameter 3.588 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 1/4 in Length through Bore 7/8 in Number of Set Screws 2