Sprocket Bore Diameter 3/4 in For Chain Pitch 1/2 in For Number of Strands Single Hub Type One Side Material Steel Maximum Bore Diameter 2 3/8 in Number of Teeth 45 Outside Diameter 7.45 in Pitch Diameter 7.168 in Bore Type Plain Chain Number 40 Finish Black Oxide For Pitch Type Single Pitch Hub Diameter 3 1/2 in Hub Projection 0.841 in Includes Set Screws Keyway Yes Keyway Depth 3/32 in Keyway Width 3/16 in Length through Bore 1 1/8 in Material Grade 1045