BlackStar H78BS12 2 7/16 K2S - 78 Pitch Finished Bore Sprocket - 12 Tooth - 2-7/16" Bore QD-N What does the T5US in

What does the T5US in 16T5/455US mean

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"name": "What are the dimensions of 19/B315

BlackStar H78BS12 2 7/16 K2S - 78 Pitch Finished Bore Sprocket - 12 Tooth - 2-7/16" Bore QD-N What does the T5US inThe BlackStar H78BS12 2 7 16 K2S is a 78 pitch Finished Bore roller chain sprocket with 12 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. This sprocket has a 2 7 16" bore with keyway and set screws and is ready for immediate installation. Specifications Part Number H78BS12 2 7 16 K2S Chain Pitch 78 Number of Teeth 12