Single Strand Sprocket Bore Diameter 1 1/4 in For Chain Pitch 3/4 in For Number of Strands Single Hub Type One Side Material Steel Maximum Bore Diameter 1 1/4 in Number of Teeth 18 Outside Diameter 4.7 in Pitch Diameter 4.319 in Bore Type Fixed Chain Number 60 Finish Black Oxide For Pitch Type Single Pitch Hub Diameter 3 1/2 in Hub Projection 0.791 in Includes Set Screws Keyway Yes Keyway Depth 1/8 in Keyway Width 1/4 in Length through Bore 1 1/4 in Material Grade 1045