Finished Bore with Keyway & SS Bore Roller Chain Sprocket, 40 Chain Size, 21 # of Teeth, Tritan, Mfr#: 40BS21H X 1 1/8

Roller Chain Sprocket, Bore Diameter 1 1/8 in, For Chain Pitch 1/2 in, For Number of Strands Single, Hub Type One Side, Material Steel, Maximum Bore Diameter 1 1/8 in, Number of Teeth 21, Outside Diameter 3.62 in, Pitch Diameter 3.355 in, Bore Type Fixed, Chain Number 40, Finish Black Oxide, Hub Diameter 2 3/4 in, Hub Projection 0.716 in, Includes Set Screws, Keyway Yes, Keyway Width 1/4 in, Length through Bore 1 in, Number of Set Screws 2