Roller Chain Sprocket Bore Diameter 14 mm For Chain Pitch 3/4 in For Number of Strands Single Hub Type No Hub Material Steel Maximum Bore Diameter 52 mm Number of Teeth 17 Outside Diameter 4.55 in Pitch Diameter 103.67 mm Bore Type Plain Chain Number 12B Finish Black Oxide Hub Diameter Not Applicable Hub Projection Not Applicable Keyway No Keyway Depth Not Applicable Keyway Width Not Applicable Length through Bore 7/16 in Number of Set Screws 0