The "M" in A480M indicates units. Because the global steel market uses both systems, ASTM fused them into one document.
| Standard | Focus | Relation to A480 | | :--- | :--- | :--- | | | Chemical & Mechanical properties (Chromium & Chromium-Nickel steels) | Refers to A480 for dimensions & tolerances | | ASTM A480 | General requirements (How to measure, edge, finish) | The master document | | ASTM A370 | Mechanical testing methods (Tensile, hardness) | Complement (A480 references A370 for test procedures) | | ASTM A693 | Precipitation hardening alloys | Refers to A480 for delivery | astm a480 a480m pdf
Using an outdated PDF can lead to non-compliance. For example, recent revisions have updated the flatness tolerances for thinner gauges and clarified definitions for "slit edge" vs. "mill edge." The "M" in A480M indicates units