BlackStar H667A8 - 667 Pitch A-Plate Sprocket - 8 Tooth Roller Clutch Bearing What does the S8M in

What does the S8M in 250-S8M-2272 mean

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Specification Value Part Number 250-S5M-525 Belt Type Timing Belt Tooth Profile S5M STD (curvilinear) Tooth Pitch 5 mm Number of Teeth 105 Belt Width 25 mm Pitch Length 525 mm (Pitch Length) Construction Chloroprene (Neoprene)

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BlackStar H667A8 - 667 Pitch A-Plate Sprocket - 8 Tooth Roller Clutch Bearing What does the S8M inThe BlackStar H667A8 is a 667 pitch A Plate roller chain sprocket with 8 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. Specifications Part Number H667A8 Chain Pitch 667 Number of Teeth 8 Bore Type Plain Bore Hub Style A Plate Strand Count Single Material Steel Hardened Teeth Yes Approx. Weight 6. 500 lbs Cross