| Standard | Focus | Key Difference | |----------|-------|----------------| | | Butting principle, double flank testing | North American standard, grade numbers A3–A15 | | ISO 1328-1:2013 | Involute gear tooth tolerances | International standard, grades 0–12 (0 is finest) | | DIN 3961-3967 | German gear tolerances | Older system, still used in Europe | | AGMA 2000-A88 | Gear classification (obsolete) | Replaced by AGMA 21801 |
The standard focuses primarily on preventing two destructive failure modes in gear teeth: Pitting Resistance (Surface Fatigue) agma 21801 pdf
Every tolerance value is derived from mathematical formulas tied to the gear's pitch diameter, face width, and module (or diametral pitch). The PDF provides tables and equations for: | Standard | Focus | Key Difference |
is a landmark engineering standard published by the American Gear Manufacturers Association (AGMA) that establishes the baseline mathematical framework for rating the pitting resistance and bending strength of spur and helical involute gear teeth. Released originally in December 1982, this document fundamentally changed how mechanical engineers calculate load capacities, modify safety coefficients, and predict gear failures like tooth breakage or surface fatigue. to provide formulae for calculating the load capacity
to provide formulae for calculating the load capacity of various types of bevel gears. Key Details of AGMA 218.01
(Pitting Geometry Factor) : Evaluates the radius of curvature of the contacting tooth profiles at the point of interest to determine surface load capacity.