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BlackStar 50BS45 2 K2S - 50 Pitch Finished Bore Sprocket - 45 Tooth - 2" Bore Urethane com/products/gates-3l630k-powerated-v-belt"The BlackStar 50BS45 2 K2S is a 50 pitch Finished Bore roller chain sprocket with 45 teeth, precision manufactured from SAE 1045 steel and features machine cut tooth profiles for smooth, reliable chain engagement. This sprocket has a 2" bore with keyway and set screws and is ready for immediate installation. Specifications Part Number 50BS45 2 K2S Chain Pitch 50 Number of Teeth 45 Bore Size 2" Minimum Bore 3 4" Maximum Bore 1 15 16" Bore Type Finished