BlackStar 80BS56 2 7/16 K2S - 80 Pitch Finished Bore Sprocket - 56 Tooth - 2-7/16" Bore 22mm com/products/pix-4-3v1520-industrial-v-belt"

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so the 7/C255 interchanges with Gates 7/C255

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60 Super HC Sheaves - QD 78724106"

BlackStar 80BS56 2 7/16 K2S - 80 Pitch Finished Bore Sprocket - 56 Tooth - 2-7/16" Bore 22mm com/products/pix-4-3v1520-industrial-v-belt"The BlackStar 80BS56 2 7 16 K2S is a 80 pitch Finished Bore roller chain sprocket with 56 teeth, precision manufactured from SAE 1045 steel and features machine cut tooth profiles for smooth, reliable chain engagement. This sprocket has a 2 7 16" bore with keyway and set screws and is ready for immediate installation. Specifications Part Number 80BS56 2 7 16 K2S Chain Pitch 80 Number of Teeth 56 Bore Size 2 7 16" Minimum Bore 1 3 8" Maximum Bore 2 15