Custom-built universal shaft hardening machines are designed to harden a maximum variety of shaft sizes. Shafts are typically loaded and unloaded manually or using lifting devices, while the hardening cycle is automatic. These machines are controlled via PLC, allowing different parameters to be set for various points on the parts. Inductors are easily replaceable and can be equipped with quenching showers if necessary. The inductor can move along the shaft at varying speeds, optimizing the process.