Turner Take-Up Unit - 55mm Bore, Eccentric Locking Collar - L3 Heavy-Duty Seal Cogged Metric V-Belt The AX56 has a 1/2"

The AX56 has a 1/2" width

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so a 12/A81 from any major manufacturer shares the same cross-section and length and runs on the same sheaves

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Turner Take-Up Unit - 55mm Bore, Eccentric Locking Collar - L3 Heavy-Duty Seal Cogged Metric V-Belt The AX56 has a 1/2"The Turner HCST211 55MM L3 is a take up unit mounted bearing unit with a 55mm bore. It features a HC series insert with eccentric locking in a cast iron housing. This unit includes enhanced sealing for extended service life. Product Specifications Bore Size 55mm Housing Style Take Up Unit Insert Series HC Shaft Attachment Eccentric Housing Material Cast Iron Bearing Type Ball Bearing Lubrication Seal L3 Heavy Duty Dynamic Load Rating 9,743 lbs Static