BlackStar 60BS15 1 1/4 K2S - 60 Pitch Finished Bore Sprocket - 15 Tooth - 1-1/4" Bore Mariner What is the Megadyne 4/B57

What is the Megadyne 4/B57 used for

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The 320J7 is a micro-v belt from D&D Global's Dura-Prime Rib Pro Serpentine - J Series line

so a 2/BK117 from any major manufacturer shares the same cross-section and length and runs on the same sheaves

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BlackStar 60BS15 1 1/4 K2S - 60 Pitch Finished Bore Sprocket - 15 Tooth - 1-1/4" Bore Mariner What is the Megadyne 4/B57The BlackStar 60BS15 1 1 4 K2S is a 60 pitch Finished Bore roller chain sprocket with 15 teeth, precision manufactured from SAE 1045 steel and features machine cut tooth profiles for smooth, reliable chain engagement. This sprocket has a 1 1 4" bore with keyway and set screws and is ready for immediate installation. Specifications Part Number 60BS15 1 1 4 K2S Chain Pitch 60 Number of Teeth 15 Bore Size 1 1 4" Minimum Bore 3 4" Maximum Bore 1 3 4" Bore