Gear Technology Magazine
www.geartechnology.com/articles/22638-optimum-carburized-and-hardened-case-depth

Optimum Carburized and Hardened Case Depth

January 1, 2020
The optimum carburized and hardened case depth for each gear failure mode is different and must be defined at different locations on the gear tooth. Current gear rating standards do not fully explain the different failure modes and do not clearly define the different locations that must be considered.