1.1 本规范涵盖了具有高强度要求材料性能的调质合金钢六角凹头螺钉（SBHCS）0.060至0.625螺纹尺寸、平沉头螺钉（SFHCS）.060至1.5螺纹尺寸和低（SLHCS）0.1120至0.625螺栓尺寸的要求。 1.2 符合本规范的紧固件适用于剪切型应用，其抗拉要求范围为122至150千磅/平方英寸。 1.3 以英寸磅为单位的数值应视为标准。 本标准中不包括其他计量单位。 1.4 危险说明仅适用于试验方法章节，第 11 ，本规范的。 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.5 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 the requirements for quenched and tempered alloy steel hexagon socket button (SBHCS) 0.060 through 0.625 thread sizes, flat countersunk (SFHCS) 0.060 through 1.5 thread sizes and low (SLHCS) 0.1120 through 0.625 thread sizes head cap screws having material properties for high-strength requirements. 1.2 Fasteners meeting this specification are intended for shear-type applications and have tensile requirements ranging from 122 to 150 ksi. 1.3 The values stated in inch-pound units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 The hazard statement applies only to the test method section, Section 11 , of this specification. 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. 1.5 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.