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BlackStar H120S60 - 120 Pitch Split Taper Sprocket - 60 Tooth 6.1/2" What does the S8M inThe BlackStar H120S60 is a 120 pitch Split Taper roller chain sprocket with 60 teeth, precision manufactured from SAE 1045 steel with induction hardened teeth for extended wear life and features machine cut tooth profiles for smooth, reliable chain engagement. This sprocket requires a Split Taper Bushing (sold separately). Specifications Part Number H120S60 Chain Pitch 120 Number of Teeth 60 Bore Type Plain Bore Hub Style Split Taper Bushing Required