BlackStar 2B64SDS - QD Sheave S8M Section The Turner UCP207 21 is

The Turner UCP207 21 is a 2-bolt pillow block mounted bearing unit with a 1-5/16" bore

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so a 32AT10/660US from any major manufacturer shares the same dimensions and runs on the same pulleys/sheaves

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BlackStar 2B64SDS - QD Sheave S8M Section The Turner UCP207 21 isThe BlackStar 2B64SDS is a 2 groove qd sheave for B section belts, manufactured from cast iron. Requires a QD Type SDS Bushing (sold separately) to mount to your shaft. Specifications Part Number 2B64SDS Product Type QD Sheave Number of Grooves 2 Belt Profile B Outside Diameter 6. 75" Material Cast Iron Approx. Weight 8. 200 lbs Bushing Required QD Type SDS Bushing Pitch Diameter 6. 4" Compatible Belts A, B, 4L, 5L Bushing Required This sheave