Single Strand Sprocket Bore Diameter 1 3/16 in For Chain Pitch 1/2 in For Number of Strands Single Hub Type One Side Material Steel Maximum Bore Diameter 1 3/16 in Number of Teeth 15 Outside Diameter 2.65 in Pitch Diameter 2.405 in Bore Type Fixed Chain Number 40 Finish Black Oxide For Pitch Type Single Pitch Hub Diameter 1 13/16 in Hub Projection 0.591 in Includes Set Screws Keyway Yes Keyway Depth 1/8 in Keyway Width 1/4 in Length through Bore 7/8 in Material Grade 1045