BlackStar 80BS55 1 1/2 K2S - 80 Pitch Finished Bore Sprocket - 55 Tooth - 1-1/2" Bore 35mm What does the 5M in

What does the 5M in 1105-5M-25 mean

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Specification Value Part Number 300-S8M-424 Belt Type Timing Belt Tooth Profile S8M STD (curvilinear) Tooth Pitch 8 mm Number of Teeth 53 Belt Width 30 mm Pitch Length 424 mm (Pitch Length) Construction Chloroprene (Neoprene)

BlackStar 80BS55 1 1/2 K2S - 80 Pitch Finished Bore Sprocket - 55 Tooth - 1-1/2" Bore 35mm What does the 5M inThe BlackStar 80BS55 1 1 2 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 1 1 2" bore with keyway and set screws and is ready for immediate installation. Specifications Part Number 80BS55 1 1 2 K2S Chain Pitch 80 Number of Teeth 55 Bore Size 1 1 2" Minimum Bore 1 3 8" Maximum Bore 2 15 16"