Roller Chain Sprocket Bore Diameter 1/4 in For Chain Pitch 1/4 in For Number of Strands Single Hub Type One Side Material Steel Maximum Bore Diameter 1 in Number of Teeth 23 Outside Diameter 1.969 in Pitch Diameter 1.836 in Bore Type Plain Chain Number 25 Finish Black Oxide Hub Diameter 1 1/2 in Hub Projection 0.515 in Keyway No Keyway Depth Not Applicable Keyway Width Not Applicable Length through Bore 5/8 in Number of Set Screws 0 Set Screw Location Not Applicable