Single Strand Sprocket Bore Diameter 5/8 in For Chain Pitch 1/2 in For Number of Strands Single Hub Type One Side Material Steel Maximum Bore Diameter 5/8 in Number of Teeth 13 Outside Diameter 2.33 in Pitch Diameter 2.089 in Bore Type Fixed Chain Number 40 Finish Black Oxide For Pitch Type Single Pitch Hub Diameter 1 9/16 in Hub Projection 0.591 in Includes Set Screws Keyway Yes Keyway Depth 3/32 in Keyway Width 3/16 in Length through Bore 7/8 in Material Grade 1045