BlackStar 60BS48 1 1/8 K2S - 60 Pitch Finished Bore Sprocket - 48 Tooth - 1-1/8" Bore SPZ Section What does the AT5US in

What does the AT5US in 16AT5/390US mean

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BlackStar 60BS48 1 1/8 K2S - 60 Pitch Finished Bore Sprocket - 48 Tooth - 1-1/8" Bore SPZ Section What does the AT5US inThe BlackStar 60BS48 1 1 8 K2S is a 60 pitch Finished Bore roller chain sprocket with 48 teeth, precision manufactured from SAE 1045 steel and features machine cut tooth profiles for smooth, reliable chain engagement. This sprocket has a 1 1 8" bore with keyway and set screws and is ready for immediate installation. Specifications Part Number 60BS48 1 1 8 K2S Chain Pitch 60 Number of Teeth 48 Bore Size 1 1 8" Minimum Bore 1" Maximum Bore 2 7 16" Bore