BlackStar H100A54S - 100 Pitch A-Plate Sprocket - 54 Tooth Double Strand What does the H in

What does the H in 1550H100 mean

"name":"Gates 286XL025 PowerGrip Timing Belts"

16/5V2030 has a top width of 11

"mpn":"TB072053461329"

BlackStar H100A54S - 100 Pitch A-Plate Sprocket - 54 Tooth Double Strand What does the H inThe BlackStar H100A54S is a 100 pitch A Plate roller chain sprocket with 54 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 H100A54S Chain Pitch 100 Number of Teeth 54 Bore Type Plain Bore Hub Style A Plate Strand Count Single Material Steel Hardened Teeth Yes Approx. Weight 67. 44 lbs Cross