本规范涵盖了适用于订购公制尺寸的铝合金标准结构形状的既定公制制造公差。标准结构形状是某些标准合金、回火、尺寸和截面的形状，例如用于结构目的的角钢、槽钢、T形三通、ZEE、工字钢和H型钢。除非另有说明，否则这些公差适用于所有条件。自1994年9月起，SAE航空航天材料部已宣布本规范为“非现行”。因此，建议本规范不适用于新设计。

This specification covers established metric manufacturing tolerances applicable to aluminum alloy standard structural shapes ordered to metric dimensions. Standard structural shapes are shapes in certain standard alloys, tempers, sizes, and sections such as angles, channels, Tees, Zees, I-Beams, and H-Beams commonly used for structural purposes. These tolerances apply to all conditions, unless otherwise noted. This specification has been declared 'NONCURRENT' by the Aerospace Materials Division, SAE, as of September 1994. It is recommended, therefore, that this specification not be specified for new designs.