BlackStar 4C80E STL - QD Sheave 10-Groove 12/C112 is a standardized industry

12/C112 is a standardized industry size

2500-20M-230 is a timing belt used on positive

"text": "The 7/D270 has a 1-1/4\" width

com/s/files/1/0666/7721/products/3M_5M_8M_14M_HTD_Timing_Belt_fe49e488-320e-448c-a06e-bf3536c2620f

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BlackStar 4C80E STL - QD Sheave 10-Groove 12/C112 is a standardized industryThe BlackStar 4C80E STL is a 4 groove qd sheave, manufactured from cast iron. Requires a QD Type E Bushing (sold separately) to mount to your shaft. Specifications Part Number 4C80E STL Product Type QD Sheave Number of Grooves 4 Outside Diameter 8. 40" Material Cast Iron Approx. Weight 33. 000 lbs Belt Profile C Bushing Required QD Type E Bushing Pitch Diameter 8. 0" Compatible Belts C Bushing Required This sheave requires a QD Type E Bushing to mount