自2007年6月起，SAE航空航天材料部已宣布本规范“取消”，并已被AMS 2251取代。每当提及已取消的MAM 2251时，应满足最新版AMS 2253的要求。通过这一行动，本文件将保留在航空航天材料规范索引的数字部分中，并注明其已被AMS 2251取代。本规范涵盖了适用于订购公制尺寸的低合金钢筋的既定公制制造公差。除非另有说明，否则这些公差适用于所有条件。术语“排除”用于适用于规定范围内的较高疲劳。没有明确的界限来区分棒材和线材产品，因此不包括这些产品的定义。

This specification has been declared "CANCELLED" by the Aerospace Materials Division, SAE, as of June 2007, and has been superseded by AMS 2251. The requirements of the latest issue of AMS 2253 shall be fulfilled whenever reference is made to the cancelled MAM 2251. By this action, this document will remain listed in the Numerical Section of the Index of the Aerospace Materials Specifications noting that is it superseded by AMS 2251.This specification covers established metric manufacturing tolerances applicable to low-alloy steel bars ordered to metric dimensions. These tolerances apply to all conditions, unless otherwise noted. The term "exclusive" is used to apply to the higher fatigue of the specified range. No clear cut demarcation is available to differentiate between bar and wire products, so no definitions of these products are included.