本规范涵盖了适用于按公制尺寸订购的铝合金和镁合金薄板和板材的既定制造公差。除非另有说明，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。贯穿本说明书，术语“度量”旨在指代SI系统。

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.