1.1 本规范涵盖了四种不同等级的圆形和异形普通碳钢和合金钢弹簧丝，其质量和回火均匀，用于制造能够在相对较低的循环次数内承受中等疲劳应力的机械弹簧。质量水平介于电线的商业质量等级之间，如规格 A401/A401米 ， A231/A231米 和 A229/a29m 以及阀门弹簧质量等级，如规范 A230/A230M ， A232/A232M 和 A877/A877M 它类似于用于中等疲劳水平的TD级（参考EN 10270-2），例如离合器弹簧所需的。该电线应处于退火和冷态- 买方规定的拉伸或淬火回火条件。 1.2 以国际单位制或英寸磅单位表示的数值应单独视为标准。每个系统中规定的值可能不是完全相等的；因此，每个系统应独立使用。将两个系统的值合并可能导致不符合标准。 1.3 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。

1.1 This specification covers four different grades of round and shaped plain carbon and alloy steel spring wire, uniform in quality and temper, intended for the manufacture of mechanical springs that can withstand moderate fatigue stresses over some relatively low number of cycles. The quality level is between the commercial quality grades of wire such as Specifications A401/A401M , A231/A231M , and A229/A229M and the valve spring quality grades such Specifications as A230/A230M , A232/A232M , and A877/A877M . It is similar to the grade TD (referenced in EN 10270-2) intended for medium fatigue levels, such as required for clutch springs. This wire shall be either in the annealed and cold-drawn or quenched and tempered condition as specified by purchaser. 1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. 1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.