本规范涵盖标称直径或厚度为5.000英寸（127.00 mm）及以下、横截面积为32平方英寸（206 cm2）及以下的挤压棒材、棒材、线材、型材形式的铝合金，以及壁厚为3.000英寸（76.20 mm）及以上、横截面积为20平方英寸（129 cm2）及以上的管材（见8.5）。

This specification covers an aluminum alloy in the form of extruded bars, rods, wire, profiles 5.000 inches (127.00 mm) and under in nominal diameter or thickness and 32 square inches (206 cm2) and under in cross-sectional area, and tubing 3.000 inches (76.20 mm) and under in wall thickness and 20 square inches (129 cm2) and under in cross-sectional area (see8.5).