BlackStar H120A21Q - 120 Pitch A-Plate Sprocket - 21 Tooth 4L Section What does the 8M in

What does the 8M in 2736-8M-85 mean

"name":"Gates P64-20M-115 PowerGrip HTD Sprockets 78824054"

The 5/B101 is used for high-shock and high-vibration drives

Specifications Part Number D60B12H 1 K2S Chain Pitch 60 Number of Teeth 12 Bore Size 1" Bore Type Plain Bore Hub Style B-Hub Strand Count Double Material Steel Outside Diameter 3

so a 2/D345 from any major manufacturer shares the same dimensions and runs on the same pulleys/sheaves

BlackStar H120A21Q - 120 Pitch A-Plate Sprocket - 21 Tooth 4L Section What does the 8M inThe BlackStar H120A21Q is a 120 pitch A Plate roller chain sprocket with 21 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 H120A21Q Chain Pitch 120 Number of Teeth 21 Bore Type Plain Bore Hub Style A Plate Strand Count Single Material Steel Hardened Teeth Yes Outside Diameter 10. 85" Pitch