What is micropitting? Micropitting is a surface fatigue phenomenon mainly observed in gears but can also occur in rolling element bearings. Micropitting causes destructive wear that can occur within the first few hours of operation. If left uncontrolled, significant equipment failures may occur. While many factors can contribute to the generation of micropitting, surface roughness and lubricant selection are key factors. Micropitting is not a new phenomenon. It has become much more prominent as gearbox design has evolved with the use of case hardened or carburized gears. Gearbox technology has achieved significant reductions in gearbox size while increasing power throughput capability. This has required all design components, including the gear oil, to improve their performance capabilities.