本规范涵盖了适用于按公制尺寸订购的铝合金和镁合金挤压棒材、棒材、线材、形状和管材的既定公制制造公差。对于某些形状，可能需要大于标准的公差；其他产品的公差可能接近标准。然而，除非买方和卖方另有约定，否则此处所示的公差适用，并且除非另有说明，否则适用于所有温度。

This specification covers established metric manufacturing tolerances applicable to aluminum alloy and magnesium alloy extruded bar, rod, wire, shapes, and tubing ordered to metric dimensions. Tolerances greater than standard may be necessary for some shapes; tolerances closer than standard may be possible for others. Tolerances shown herein, however, apply unless otherwise agreed upon by purchaser and vendor and apply to all tempers, unless otherwise noted.