Before 2001, US and European gear manufacturers used different tolerance charts. This standard bridged that gap, allowing a gear graded "AGMA 10" to be roughly equivalent to an "ISO 8." However, note that AGMA 2015-1-A01 explicitly states that it is not a direct dual-number standard with ISO 1328, but rather a reinterpretation for the North American market.
A major change in this standard is the direction of its numbering system: Grade Range: A2 through A11. Precision Direction: Lower numbers equal higher precision (e.g., A2 is very precise; A11 is less precise). agma 2015-1-a01 pdf
The standard, titled "Accuracy Classification System – Tangential Measurements for Cylindrical Gears," is a critical document for gear manufacturers and engineers. It establishes a unified system for measuring and classifying the accuracy of spur and helical gears, replacing the older ANSI/AGMA 2000-A88 and ANSI/AGMA ISO 1328-1 standards. Before 2001, US and European gear manufacturers used
While newer standards exist (AGMA 2015-1-A14, and draft versions for 2025), the A01 revision remains alive in legacy equipment, spare parts manufacturing, and repair shops. Trying to interpret gear tolerances without this precision document leaves your quality control to guesswork. Precision Direction: Lower numbers equal higher precision (e
If you have typed into a search engine, you are likely a mechanical engineer, a gear designer, or a quality control specialist dealing with cylindrical gears. You aren't just looking for any document; you are looking for the definitive American National Standard for Accuracy Classification of Cylindrical Gears .