The gear industry has moved toward global harmonization. Most modern AGMA standards are now aligned with ISO 6336 and ISO 1328 . 3. Current Replacements

Place both the test gear and master gear in the inspection lab at 20°C (±2°C) for at least 2 hours.

Many websites claiming to offer a free "agma 21801 pdf" are either providing outdated scanned copies (circa 1982) or are distributing copyrighted material illegally. AGMA standards are protected intellectual property. Using a counterfeit PDF can lead to non-conformance during ISO audits (ISO 9001 requires using current, traceable standards).