Single Strand Sprocket Bore Diameter 1 in For Chain Pitch 1/2 in For Number of Strands Single Hub Type One Side Material Steel Maximum Bore Diameter 1 in Number of Teeth 23 Outside Diameter 3.94 in Pitch Diameter 3.672 in Bore Type Fixed Chain Number 40 Finish Black Oxide For Pitch Type Single Pitch Hub Diameter 3 in Hub Projection 0.716 in Includes Set Screws Keyway Yes Keyway Depth 1/8 in Keyway Width 1/4 in Length through Bore 1 in Material Grade 1045