Durability is the most important criterion used to define the quality of a gear.
It has also brought many additional durability benefits to metals. The deep cryogenic tempering process for gears is an inexpensive, one-time, permanent treatment, affecting the entire part, nut just the surface. Gears may be new or used, sharp or dull, and re-sharpening will not destroy the treatment. The process has a number of obvious benefits, including increases in tensile strength, toughness, and stability through the release of internal stresses. Steel surfaces receiving wear, such as gears, shaper cutters, drill bits, end mills, taps, dies, surgical scissors, bearings, racing engines, slicer's, and granulator knives, all benefit from this inexpensive treatment.