These metal disc-spring couplings with ultra-high torsional stiffness were developed for servo motor applications. The disc-spring method provides exnt properties: firmness in the torsional direction but flexibility in the bending, step-difference, and axial directions. The disc spring that serves as the beatable theoretically derived shape that is the result of rigorous analysis with the latest finite hese couplings are available in a full or many different applications. Compact and lightweight SFC models use high-strength aluminum alloy for the hub material.Â