Sprocket Bore Diameter 1/2 in For Chain Pitch 3/8 in For Number of Strands Single Hub Type One Side Material Steel Maximum Bore Diameter 11/16 in Number of Teeth 13 Outside Diameter 1.75 in Pitch Diameter 1.567 in Bore Type Plain Chain Number 35 Finish Black Oxide For Pitch Type Single Pitch Hub Diameter 1 1/4 in Hub Projection 0.582 in Includes Set Screws Keyway Yes Keyway Depth 1/16 in Keyway Width 1/8 in Length through Bore 3/4 in Material Grade 1045