The photo shows a cut sample of an automobile powertrain lebro joint
(cross groove universal joint) whose outer has been hardened by our machine.

We used our original SMT coil for lebro joint and BJ outer inner surface hardening.

By one-shot hardening the rotating workpiece, an ideal casing is achieved.

The stem section is hardened by single shot hardening using our specialized semi-open coil.
This method achieves an ideal hardened pattern along the outer diameter all the way to the corners while maintaining high productivity.