Single Strand Sprocket Bore Diameter 1 1/4 in For Chain Pitch 1/2 in For Number of Strands Single Hub Type One Side Material Steel Maximum Bore Diameter 1 1/4 in Number of Teeth 16 Outside Diameter 2.81 in Pitch Diameter 2.563 in Bore Type Fixed Chain Number 40 Finish Black Oxide For Pitch Type Single Pitch Hub Diameter 2 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