This process is another way of altering the surface properties of a part for improving the resistance to surface indentation, fatigue and wear. It is achieved by using a low temperature process to control size change. This process will give parts a surface hardness up to 1100 HV and a case depth from 0.005 – 0.030 inches (0.1 – 0.6 mm). Gears, shafts and sprockets are just a few examples of parts that lend themselves to gas nitriding.