1.1 本规范 2. 涵盖各种尺寸范围内的碳、合金和马氏体不锈钢螺母 1. / 4. 至4英寸，公制M12至M100标称值。它还包括尺寸范围内的奥氏体不锈钢螺母 1. / 4. in.和M12标称值及以上。这些螺母适用于高压或高温环境，或两者兼而有之。未经买方许可，不得进行等级替换。 1.2 制作螺母的棒材应为热锻棒材。材料可以通过无心磨削或冷拉进一步加工。奥氏体不锈钢可以进行固溶退火或退火和应变硬化。当根据补充要求S1订购退火和应变硬化奥氏体不锈钢时，买方应特别注意确保 8.2.2 ，补充要求S1，以及 附录X1 完全理解。 1.3 提供了可选性质的补充要求。这些仅在询价、合同和订单中有规定时适用。 1.4 本规范以英寸磅单位和国际单位制表示。但是，除非订单规定了适用的“M”规格名称（SI单位），否则材料应以英寸-磅单位提供。 1.5 以英寸磅单位或国际单位制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。在正文中，国际单位制显示在括号中。 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 2 covers a variety of carbon, alloy, and martensitic stainless steel nuts in the size range 1 / 4 through 4 in. and metric M12 through M100 nominal. It also covers austenitic stainless steel nuts in the size range 1 / 4 in. and M12 nominal and above. These nuts are intended for high-pressure or high-temperature service, or both. Grade substitutions without the purchaser's permission are not allowed. 1.2 Bars from which the nuts are made shall be hot-wrought. The material may be further processed by centerless grinding or by cold drawing. Austenitic stainless steel may be solution annealed or annealed and strain-hardened. When annealed and strain hardened austenitic stainless steel is ordered in accordance with Supplementary Requirement S1, the purchaser should take special care to ensure that 8.2.2 , Supplementary Requirement S1, and Appendix X1 are thoroughly understood. 1.3 Supplementary requirements of an optional nature are provided. These shall apply only when specified in the inquiry, contract, and order. 1.4 This specification is expressed in both inch-pound units and in SI units. However, unless the order specifies the applicable “M” specification designation (SI units), the material shall be furnished to inch-pound units. 1.5 The values stated in either inch-pound units or SI 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. Within the text, the SI units are shown in brackets. 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.