The product shown in the picture is a cut sample of a small diameter precise ball screw.
The bottom (diagonally right) product has been processed using an ordinary quenching technique.

The top (center) product’s appearances are exactly as before processing.
However, inner portion is quenched completely.

As one can see, our “non-oxidation quenching” will not cause any scale as ordinary quenching.
This method requires no after treatment as shot blast.
In other words, scales and sands which can cause reduction of after treatment preciseness will not be problematic.