The "M" in A480M indicates that the standard includes . Professionals often seek the ASTM A480 A480M PDF to access critical tolerance tables and finish definitions required for procurement and quality control. Key Components of the Specification
Many buyers assume a 0.250" plate is exactly 0.250". A480 allows for minus tolerances. For strip products, the tolerance varies by width. Always check Table A2.1 (inch-pound) or Table A2.1M (SI). astm a480 a480m pdf