SPA V-belt pulleys for BK-RZ bush

SPA V-belt pulleys for BK-RZ bush have a plain bore that takes a keyless locking bush. When the screws are tightened, the bush expands in the pulley and clamps onto the shaft, transmitting torque by friction alone - without a key and without a keyway in the shaft.

SPA pulley for BK-RZ - any position on the shaft without a keyway

You can set the pulley at any point along the shaft and at any angular position, which makes it easier to align with the mating pulley. A shaft without a keyway is stronger, and the connection copes well with variable loads, which is why such pulleys are popular in agricultural machinery.

SPA V-belt pulleys with a bore for a keyless locking bush

Single and multi-groove SPA pulleys with a bore for a keyless locking bush. The bush bore diameter is given in the pulley name as D, and exact dimensions - on the product page. Bushes can be found in the Keyless locking bushes group.

Frequently asked questions about SPA pulleys for BK-RZ locking bushes

Is a keyway needed on the shaft?

No. A keyless locking bush transmits torque by friction alone, so a plain shaft with a diameter matching the bush bore is sufficient.