BlackStar H60BS21 1 K2S - 60 Pitch Finished Bore Sprocket - 21 Tooth - 1" Bore AT5 com/products/pix-2-5v1650-industrial-v-belt"

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What does the T5US in 16T5/455US mean

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"name": "Is C61 interchangeable with Gates C61

The 5/8V1180 ships from the Texas Belting & Supply warehouse in Houston

BlackStar H60BS21 1 K2S - 60 Pitch Finished Bore Sprocket - 21 Tooth - 1" Bore AT5 com/products/pix-2-5v1650-industrial-v-belt"The BlackStar H60BS21 1 K2S is a 60 pitch Finished Bore 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. This sprocket has a 1" bore with keyway and set screws and is ready for immediate installation. Specifications Part Number H60BS21 1 K2S Chain Pitch 60 Number of Teeth 21 Bore Size 1"