The Z3 Expansion Sleeve designed to replace traditional keyed joints and utilizes the principle of mechanical wedging to ensures excellent concentricity between the shaft and the driven component, significantly reducing vibration and runout in high-speed machinery.

By tightening the high-strength bolts, the inner and outer tapered surfaces slide against each other, generating immense radial pressure. This creates a secure, friction-based lock capable of transmitting high torque and axial loads without the need for keyways.