1.1本规范仅涵盖特殊设计的碳钢起重机轨道，起重机跑道使用的标称重量为104 lb/yd（51.6 kg/m）至175 lb/yd（86.8 kg/m）。 1.2当需要标准三通轨段时，应根据规范订购 A1 . 1.3提供了可选性质的补充要求S1至S3。仅当买方在订单中指定时，才适用。 1.4以英寸-磅为单位的数值应视为标准值。括号中给出的值是到国际单位制的数学转换，仅供参考，不被视为标准值。

1.1 This specification covers carbon steel crane rails of special designs only, and nominal weights of 104 lb/yd (51.6 kg/m) through 175 lb/yd (86.8 kg/m) for crane runway use. 1.2 When standard tee rail sections are desired, they shall be ordered in accordance with Specification A1 . 1.3 Supplementary Requirements S1 through S3 of an optional nature are provided. They shall apply only when specified by the purchaser in the order. 1.4 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.