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BlackStar 80C72 - 80 Pitch C-Hub Sprocket - 72 Tooth Narrow 2-Bolt Flange Block com/products/d-and-d-1048-8m-450-timing-belt"The BlackStar 80C72 is a 80 pitch C Hub roller chain sprocket with 72 teeth, precision manufactured from SAE 1045 steel and features machine cut tooth profiles for smooth, reliable chain engagement. Specifications Part Number 80C72 Chain Pitch 80 Number of Teeth 72 Minimum Bore 1 1 2" Maximum Bore 4 1 4" Bore Type Plain Bore Hub Style C Hub Strand Count Single Material Steel Outside Diameter 23. 50" Pitch Diameter 22. 926" Approx. Weight 81. 4 lbs