Gear Technology Magazine
www.geartechnology.com/articles/21688-case-depth-and-load-capacity-of-case-carburized-gears

Case Depth and Load Capacity of Case-Carburized Gears

March 1, 2002
Compared to non-heat-treated components, case-carburized gears are characterized by a modified strength profile in the case-hardened layer. The design of case-carburized gears is based on defined allowable stress numbers. These allowable stress numbers are valid only for a defined "optimum" case depth. Adequate heat treatment and optimum case depth guarantee maximum strength of tooth flank and tooth root.