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TRITAN Finished Bore B-Hub Sprocket features one setscrew over the keyway and a second setscrew at 90 degrees. With high quality carbon steel construction, this sprocket with 1/2 inch pitch has 12 teeth, 3/4 inch finished bore and a recessed groove in hub for chain clearance. Sprocket has a black oxide finish and is heat treated. ANSI sprocket # 40. TRITAN produces world class power transmission products using select alloy steel, advanced quality control and testing systems to ensure the highest quality.