BlackStar D80B14 1 1/2 K2S - Double Strand 80 Pitch B-Hub Sprocket - 14 Tooth - 1-1/2" Bore 3.3/16" com/products/d-and-d-1040-8mk-30-timing-belt"

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What does the T10US in 16T10/1520US mean

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BlackStar D80B14 1 1/2 K2S - Double Strand 80 Pitch B-Hub Sprocket - 14 Tooth - 1-1/2" Bore 3.3/16" com/products/d-and-d-1040-8mk-30-timing-belt"The BlackStar D80B14 1 1 2 K2S is a 80 pitch double strand B Hub roller chain sprocket with 14 teeth, precision manufactured from SAE 1045 steel and features machine cut tooth profiles for smooth, reliable chain engagement. This sprocket has a 1 1 2" bore and is ready for immediate installation. Specifications Part Number D80B14 1 1 2 K2S Chain Pitch 80 Number of Teeth 14 Bore Size 1 1 2" Bore Type Plain Bore Hub Style B Hub Strand Count Double