Roller Chain Sprocket Bore Diameter 3/4 in For Chain Pitch 1/4 in For Number of Strands Single Hub Type One Side Material Steel Maximum Bore Diameter 3/4 in Number of Teeth 22 Outside Diameter 1.889 in Pitch Diameter 1.757 in Bore Type Fixed Chain Number 25 Finish Black Oxide Hub Diameter 1 7/16 in Hub Projection 0.515 in Includes Set Screws Keyway Yes Keyway Width 3/16 in Length through Bore 5/8 in Number of Set Screws 2