Single Strand Sprocket, Bore Diameter 5/8 in, For Chain Pitch 1/2 in, For Number of Strands Single, Hub Type One Side, Material Steel, Maximum Bore Diameter 5/8 in, Number of Teeth 19, Outside Diameter 3.3 in, Pitch Diameter 3.038 in, Bore Type Fixed, Chain Number 40, Finish Black Oxide, For Pitch Type Single Pitch, Hub Diameter 2 1/2 in, Hub Projection 0.716 in, Includes Set Screws, Keyway Yes, Keyway Depth 3/32 in, Keyway Width 3/16 in, Length through Bore 1 in, Material Grade 1045