BlackStar 2BK57 1 3/8 - Fixed Bore Sheave - 1 3/8" Bore flexco-alligator-15h The 4/5V2120 has a 5/8"

The 4/5V2120 has a 5/8" width

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Megadyne C390 V-Belt

BlackStar 2BK57 1 3/8 - Fixed Bore Sheave - 1 3/8" Bore flexco-alligator-15h The 4/5V2120 has a 5/8"The BlackStar 2BK57 1 3 8 is a 2 groove fixed bore sheave for B section belts, manufactured from cast iron. Features a 1 3 8" finished bore with keyway and set screws for direct shaft mounting. Specifications Part Number 2BK57 1 3 8 Product Type Fixed Bore Sheave Number of Grooves 2 Belt Profile B Bore Size 1 3 8" Material Cast Iron Approx. Weight 4. 925 lbs Cross references: Browning 2BK57 1 3 8, Martin 2BK57 1 3 8, Maska 2BK57 1 3 8 Compatible