Single Strand Sprocket Bore Diameter 1/2 in For Chain Pitch 1/2 in For Number of Strands Single Hub Type One Side Material Steel Maximum Bore Diameter 1/2 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 No Keyway Depth Not Applicable Keyway Width Not Applicable Length through Bore 7/8 in