BlackStar 2BK52 1 3/8 - Fixed Bore Sheave - 1 3/8" Bore Pitch-240 com/products/d-and-d-25t5-360us-timing-belt"

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The SPZ2137 has a 9

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so a 3500-14MK-55 from any major manufacturer shares the same dimensions and runs on the same pulleys/sheaves

BlackStar 2BK52 1 3/8 - Fixed Bore Sheave - 1 3/8" Bore Pitch-240 com/products/d-and-d-25t5-360us-timing-belt"The BlackStar 2BK52 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 2BK52 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. 275 lbs Cross references: Browning 2BK52 1 3 8, Martin 2BK52 1 3 8, Maska 2BK52 1 3 8 Compatible