Sprocket, Industry Chain Size 50, Industry Chain Pitch 5/8 in, Number of Teeth - Sprockets 13, Fixed Bore, Bore Dia. - Sprockets 1 1/8 in, Outside Dia. 2.913 in, Single Number of Chain Rows, Material - Sprockets Steel, Pitch Dia. 0.625 in, Type B, Length through Bore 1.0 in, Hub Dia. 1.875 in, Set Screw Hole Dia. 0.313 in, Keyway Size 1/4 in x 1/8 in, Setscrew Location One Setscrew Over The Keyway and A Second Setscrew At 90 Degrees , For Use With Roller Chain