1.1 本规范涵盖了用于混凝土钢筋的切割长度的变形钢筋，其一端或两端附有头部。封头由锻造成型、棒材机加工或板材切割而成。附件可以通过以下方式完成: 1.1.1 焊接； 1.1.2 从钢筋端部整体热锻头部； 1.1.3 头部内螺纹与杆端螺纹配合； 1.1.4 将外螺纹联接套筒冷锻到钢筋上； 1.1.5 将外部联接套筒冷挤压到钢筋上； 1.1.6 将外部联接套筒或带头套筒冷锻到钢筋上； 1.1.7 用铁将联接套筒连接到钢筋的末端- 填料介质；或 1.1.8 分离螺母，将头部固定到杆上。 注1: 本规范的要求仅适用于通过以下方法之一完成头部连接的带头钢筋 1.1 . 1.2 封头尺寸的限制以及封头支承面上非平面特征上杆变形的障碍和中断见 附件A1 .中的要求 附件A1 仅在买方指定时适用（见 4.2.5 ). 1.3 本规范适用于规格A970的英寸-磅单位订单或规格A970M的国际单位订单。 1.4 以英寸表示的值- 磅单位或国际单位制应单独视为标准单位。在文本中，国际单位制显示在括号中。每个系统中所述的值可能不是完全等效的；因此，每个系统都应独立使用。结合两个系统的值可能会导致不符合规范。 1.5 本标准并不旨在解决与其使用相关的所有安全问题（如果有的话）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。 1.6 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 deformed steel reinforcing bars in cut lengths, with a head attached to one or both ends, for concrete reinforcement. Heads are forge-formed, machined from bar stock, or cut from plate. Attachment can be accomplished through: 1.1.1 Welding; 1.1.2 Integrally hot forging of a head from the reinforcing bar end; 1.1.3 Internal threads in the head mating to threads on the bar end; 1.1.4 Cold-swaging an externally threaded coupling sleeve onto the reinforcing bar; 1.1.5 Cold-extruding an external coupling sleeve onto the reinforcing bar; 1.1.6 Cold-swaging an external coupling sleeve or headed sleeve onto the reinforcing bar; 1.1.7 Attaching a coupling sleeve to the end of the reinforcing bar by means of the means of a ferrous-filler medium; or 1.1.8 Separate threaded nut to secure the head to the bar. Note 1: The requirements of this specification are only applicable to headed bars where the attachment of the head is accomplished by one of the methods listed in 1.1 . 1.2 Limitations on head dimensions and on obstructions and interruptions of bar deformations on the non-planar features on the bearing face of the head are presented in Annex A1 . The requirements in Annex A1 only apply when specified by the purchaser (see 4.2.5 ). 1.3 This specification is applicable for orders in either inch-pound units as Specification A970 or SI units as Specification A970M. 1.4 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. 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 specification. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.6 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.