Sprocket, Bore Diameter 5/8 in, For Chain Pitch 3/8 in, For Number of Strands Single, Hub Type One Side, Material Steel, Maximum Bore Diameter 1 1/2 in, Number of Teeth 40, Outside Diameter 4.99 in, Pitch Diameter 4.78 in, Bore Type Plain, Chain Number 35, Finish Black Oxide, For Pitch Type Single Pitch, Hub Diameter 2 1/4 in, Hub Projection 0.832 in, Includes Set Screws, Keyway Yes, Keyway Depth 3/32 in, Keyway Width 3/16 in, Length through Bore 1 in, Material Grade 1045