Sprocket Bore Diameter 1 3/16 in For Chain Pitch 1 in For Number of Strands Single Hub Type One Side Material Steel Maximum Bore Diameter 3 1/4 in Number of Teeth 30 Outside Diameter 10.11 in Pitch Diameter 9.567 in Bore Type Plain Chain Number 80 Finish Black Oxide For Pitch Type Single Pitch Hub Diameter 4 3/4 in Hub Projection 1.425 in Includes Set Screws Keyway Yes Keyway Depth 1/8 in Keyway Width 1/4 in Length through Bore 2 in Material Grade 1045