BlackStar H100A90 - 100 Pitch A-Plate Sprocket - 90 Tooth 5.7/16" so the Megadyne 18/8V1500 interchanges

so the Megadyne 18/8V1500 interchanges with Gates

The 19/8V4500 has a 1" width

What is 300J8 used for

com/s/files/1/0666/7721/products/Double_V_Belt_5d636c00-4b03-40eb-8377-889297dd50c0

Is 6/A80 the same as other brands' 6/A80

BlackStar H100A90 - 100 Pitch A-Plate Sprocket - 90 Tooth 5.7/16" so the Megadyne 18/8V1500 interchangesThe BlackStar H100A90 is a 100 pitch A Plate roller chain sprocket with 90 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 H100A90 Chain Pitch 100 Number of Teeth 90 Bore Type Plain Bore Hub Style A Plate Strand Count Single Material Steel Hardened Teeth Yes Approx. Weight 184. 0 lbs Cross