Agma: 21801 Pdf

| 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 |