We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Metal V-belt pulley with single groove and quick-detachable bushed bore

Tb Wood'S

Tb Wood'S 521B Quick Detachable Bushed Bore 1 Groove V-Belt

SKU CH-S916-EDW24

Quick-detachable bushed bore sheave with one groove accepts 4L, 5L, A, AX, B and BX belts at 4.8 in and 5.2 in pitch diameters

  • TypeSheaves & Pulleys
  • Quick-detach bushing speeds belt changes
  • Single-groove design fits 4L, 5L, A, AX, B, BX belts
  • 8 in pitch diameter on A/AX and 4L sizes
  • 2 in pitch diameter on B/BX and 5L sizes
  • New condition ready for immediate installation

Quick Detachable Bushed Bore

The Tb Wood'S 521B is a single groove V-belt pulley designed for power transmission systems that use a quick detachable bushing. It accepts belt trade sizes 4L, 5L, A, AX, B and BX, making it suitable for maintenance crews and machine shops standardising on these common profiles.

Pitch Diameter Range 4.8 to 5.2 Inches

Under continuous operation the sheave presents a 4.8 inch pitch diameter for A and AX belts and a 5.2 inch pitch diameter for B and BX belts. These fixed diameters deliver consistent speed ratios and belt grip during sustained load cycles without the vibration that can develop on worn or mismatched grooves.

Replaces Fixed Bore Sheaves

This bushed bore model replaces fixed bore pulleys when shaft sizes vary between 1/2 inch and 1-15/16 inch, allowing the same sheave to serve multiple motor or driven equipment frames. The upgrade is worth it when inventory reduction and faster changeovers outweigh the cost of stocking compatible QD bushings.

Highlights

  • Quick-detach bushing speeds belt changes
  • Single-groove design fits 4L, 5L, A, AX, B, BX belts
  • 8 in pitch diameter on A/AX and 4L sizes
  • 2 in pitch diameter on B/BX and 5L sizes
  • New condition ready for immediate installation

Specifications

TypeSheaves & Pulleys

Questions about this item

How much heat or noise does the 521B pulley generate during continuous operation?

The 521B pulley is a passive metal component with no motor or fan, so it produces no measurable heat or noise of its own; any sound or temperature rise comes from the belt friction and the driven machinery.

What bushing must I already own to mount this 521B pulley on a shaft?

This pulley requires a Quick Detachable bushing that matches your shaft diameter; the bore accepts bushings covering 1/2 in to 1-15/16 in, so you need the correct QD bushing size for your shaft.

Will the 521B work with the A and B belts on my older drive?

Yes, the 521B lists pitch diameters of 4.8 in for A and AX belts and 5.2 in for B and BX belts, so it matches standard A and B belt drives.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.