BlackStar 80BS55 2 15/16 K2S - 80 Pitch Finished Bore Sprocket - 55 Tooth - 2-15/16" Bore TL2525 What does the 5M in

What does the 5M in 1690-5M-09 mean

a 40° sheave angle and a 8500 mm (Pitch Length)

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BlackStar 80BS55 2 15/16 K2S - 80 Pitch Finished Bore Sprocket - 55 Tooth - 2-15/16" Bore TL2525 What does the 5M inThe BlackStar 80BS55 2 15 16 K2S is a 80 pitch Finished Bore roller chain sprocket with 55 teeth, precision manufactured from SAE 1045 steel and features machine cut tooth profiles for smooth, reliable chain engagement. This sprocket has a 2 15 16" bore with keyway and set screws and is ready for immediate installation. Specifications Part Number 80BS55 2 15 16 K2S Chain Pitch 80 Number of Teeth 55 Bore Size 2 15 16" Minimum Bore 1 3 8" Maximum Bore 2