Roller Chain Sprocket Bore Diameter 5/8 in For Chain Pitch 1/2 in For Number of Strands Double Hub Type One Side Material Steel Maximum Bore Diameter 2 1/4 in Number of Teeth 26 Outside Diameter 4.42 in Pitch Diameter 4.148 in Bore Type Plain Chain Number 40-2 Finish Black Oxide Hub Diameter 3 1/4 in Hub Projection 0.784 in Keyway No Keyway Depth Not Applicable Keyway Width Not Applicable Length through Bore 1 5/8 in Number of Set Screws 0 Set Screw Location Not Applicable