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:
: This standard covers generated straight, Zerol, and spiral bevel gears. agma 21801 pdf
| Feature | AGMA 21801 (AGMA 2015-1) | ISO 1328 | DIN 3962/63 | | :--- | :--- | :--- | :--- | | | 3 to 15 (higher = better) | 0 to 12 (lower = better) | 1 to 12 (lower = better) | | Focus | Involute cylindrical gears | General cylindrical gears | Helical & spur gears | | Composite Testing | Strong emphasis (legacy) | Less emphasis | Moderate | | Common Industries | US industrial, off-highway, defense | Global automotive, general industrial | European machinery, wind energy | Every tolerance value is derived from mathematical formulas
: For official, up-to-date, and certified engineering standards, you should visit the AGMA Store , where they provide current standards that replace 218.01. First, plays a massive role
First, plays a massive role. Mechanical systems are designed to last decades. Engineers maintaining gearboxes designed in the 1980s or 90s often encounter drawings referencing AGMA 218.01 Quality Numbers (e.g., "Q10 per AGMA 218.01"). To properly inspect or reverse-engineer these parts, the original standard is required. Modern standards like AGMA 2015 do not map one-to-one with the older Quality Numbers, making the old PDF a necessary reference tool.