Roller Chain Sprocket Bore Diameter 3/4 in For Chain Pitch 5/8 in For Number of Strands Double Hub Type One Side Material Steel Maximum Bore Diameter 2 in Number of Teeth 25 Outside Diameter 5.32 in Pitch Diameter 4.987 in Bore Type Plain Chain Number 50-2 Finish Black Oxide Hub Diameter 3 in Hub Projection 0.83 in Keyway No Keyway Depth Not Applicable Keyway Width Not Applicable Length through Bore 1 7/8 in Number of Set Screws 0 Set Screw Location Not Applicable