We, at Ionitech, receive different tools and parts for nitriding from different Industries. And some of them pose challenges and requirements that stand out. We got a very interesting requirement - nitriding small gears made of steel grade AISI 4142 (42CrMo4), with a request to achieve a very small diffusion layer of less than 100 microns depth. This case stands out, and it is interesting because this steel grade is usually very good for nitriding and achieves a great balance of surface hardness and diffusion depth, as we will look into it in another of our studies. Still, the requirement was for a small diffusion depth of less than 100 microns.