Sprocket Bore Diameter 3/4 in For Chain Pitch 5/8 in For Number of Strands Single Hub Type One Side Material Steel Maximum Bore Diameter 2 in Number of Teeth 26 Outside Diameter 5.52 in Pitch Diameter 5.185 in Bore Type Plain Chain Number 50 Finish Black Oxide For Pitch Type Single Pitch Hub Diameter 3 in Hub Projection 0.907 in Includes Set Screws Keyway Yes Keyway Depth 3/32 in Keyway Width 3/16 in Length through Bore 1 1/4 in Material Grade 1045