1.1 本规范涵盖用作机械卡套管的冷拔炉对焊碳钢管。 1.2 本规范涵盖圆形、方形、矩形和特殊形状的机械卡套管。 1.3 所涵盖的圆管尺寸范围为外径最大为3 1. / 2. 英寸[90毫米]，壁厚为0.035至0.500英寸[0.89至12.70毫米]。 1.4 提供了可选的补充要求，必要时应在订单中说明。 1.5 该产品有多种等级（第节 7. 表1和 2. 和条件（第节 6. ). 1.6 单位-- 本规范以两英寸表示- 磅单位和国际单位制；但是，除非采购订单或合同规定了适用的M规格名称（SI单位），否则应采用英寸磅单位。以英寸磅单位或国际单位制表示的数值应单独视为标准。在正文中，国际单位制显示在括号中。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。将两个系统的值结合起来可能会导致不符合标准。以英寸磅为单位的数值应视为标准。 括号中给出的值是国际单位制的数学转换，仅供参考，不被视为标准。 1.7 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 cold-drawn furnace-buttweld carbon steel tubes for use as mechanical tubing. 1.2 This specification covers round, square, rectangular, and special shape mechanical tubing. 1.3 Round tube size ranges covered are outside diameters up to 3 1 / 2 in. [90 mm] and wall thickness from 0.035 to 0.500 in. [0.89 to 12.70 mm]. 1.4 Optional supplementary requirements are provided and, when desired, shall be so stated in the order. 1.5 This product is available in various grades (Section 7 Tables 1 and 2 and conditions (Section 6 ). 1.6 Units— This specification is expressed in both inch-pound units and in SI units; however, unless the purchase order or contract specifies the applicable M specification designation (SI units), the inch-pound units shall apply. 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 nonconformance with the standard. The values stated in inch-pound units are to be regarded as standard. The values given in brackets are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.7 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.