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BlackStar H160A21R - 160 Pitch A-Plate Sprocket - 21 Tooth Neoprene com/products/gates-650j25-micro-v-belt"The BlackStar H160A21R is a 160 pitch A Plate roller chain sprocket with 21 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. Specifications Part Number H160A21R Chain Pitch 160 Number of Teeth 21 Bore Type Plain Bore Hub Style A Plate Strand Count Single Material Steel Hardened Teeth Yes Outside Diameter 14. 47" Pitch