本规范涵盖了适用于订购公制尺寸的铝合金和镁合金板材和板材的既定制造公差。除非另有说明，否则这些公差适用于所有条件。这些表基于逻辑度量值和首选度量大小。在本规范中，“公制”一词指的是国际单位制。

This specification covers established manufacturing tolerances applicable to aluminum alloy and magnesium alloy sheet and plate ordered to metric dimensions. These tolerances apply to all conditions, unless otherwise noted. These tables are based on logical metric values and preferred metric sizes. Throughout this specification, the term 'metric' is intended to refer to the SI system.