BlackStar H50B30 - 50 Pitch B-Hub Sprocket - 30 Tooth VS v=1698973552"

v=1698973552"

The 12/C197 is a banded v-belt from D&D Global's Dura-Prime Band Classical - C Series line

"mpn":"TB072053747621"

so the 4/5V670 interchanges with Gates 4/5V670

BlackStar H50B30 - 50 Pitch B-Hub Sprocket - 30 Tooth VS v=1698973552"The BlackStar H50B30 is a 50 pitch B Hub roller chain sprocket with 30 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 H50B30 Chain Pitch 50 Number of Teeth 30 Minimum Bore 3 4" Maximum Bore 2 1 4" Bore Type Plain Bore Hub Style B Hub Strand Count Single Material Steel Hardened Teeth Yes