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Due to minimal-to-no distortion with UltraGlow® Ion Nitriding, this means there's no need to grind the tooth form after heat-treatment and the products can be put directly into service.


UltraGlow® Ion Nitriding increases wear and scuffing (scoring) resistance of the tooth flanks and bending fatigue resistance at the tooth root as well as the rolling contact fatigue (RCF) resistance of the gear teeth surface. It also produces high resistance to tempering i.e. increases the resistance of the steel to softening at slightly elevated temperatures. Stress studies on nitrided case show there are areas of compressive stresses beneath the surface of the diffusion zone. Additionally, these studies indicate that stress values are at their peak in the most highly alloyed steels.

UltraGlow® Ion Nitrided gears made from an appropriate material can replace carburized and carbonitrided gears. Comparison of tooth flank fatigue strength for different types of steel showed effect of case depth, core hardness, and microstructure on fatigue strength. The load bearing capacity at the flank and root of the gear tooth are affected by thickness of the compound zone; UltraGlow® Ion Nitrided gears with a maximum of one micron compound zone thickness have the highest load bearing capacity. Nitrided gears do not require as much case depth as required in carburized or other case hardened gears, and tensile strength of core material prior to UltraGlow® Ion Nitriding should be taken into account in assessment. 

Precision gears

AGMA quality class: 10-12 diametral pitch 24-96 precision gears.


Recommended case depth based on a diametral pitch of a gear:

Diametral Pitch Case Depth (inches)
72 0.0005-0.0001
48 0.001-0.002


30 0.002-0.004
10 0.008-0.015
6 0.015-0.020