1.1 本规范涵盖了由钢和合金钢制造的淬火和回火螺栓的化学、物理和机械要求，尺寸为英寸和公制，具有两种强度等级、两种类型和两种样式。 1.1.1 本规范是对六个ASTM标准的巩固和替换，包括:；A325、A325M、A490、A490M、F1852和F2280。 1.1.2 该综合标准旨在确保具有相同预期最终用途的标准之间的一致性，并简化结构螺栓规范的使用和维护。 1.2 预期用途: 1.2.1 根据本规范制造的螺栓适用于《高强度结构接头规范》中涵盖的结构连接- 强度螺栓，由结构连接研究委员会批准。 1.2.2 本规范中的螺栓尺寸为 1. / 2. 至1- 1. / 2. 包括英寸和M12至M36。 1.3 分类 表1 : 1.3.1 螺栓按等级指定，表示英寸或公制强度和样式。 1.3.2 螺栓由表示原材料化学成分的类型指定。 1.3.3 螺栓由表示重型六角螺栓或“扭转”式组件的样式指定。 1.4 本规范中使用的术语定义见 F1789 。 1.5 单位-- 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。 1.6 表格脚注是要求。注释是建议性的。 1.7 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。 1.8 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 chemical, physical and mechanical requirements for quenched and tempered bolts manufactured from steel and alloy steel, in inch and metric dimensions, in two strength grades, two types and two styles. 1.1.1 This specification is a consolidation and replacement of six ASTM standards, including; A325, A325M, A490, A490M, F1852 and F2280. 1.1.2 This consolidated standard is to ensure alignment between standards with the same intended end use and to simplify the use and maintenance of structural bolt specifications. 1.2 Intended Use: 1.2.1 Bolts manufactured under this specification are intended for use in structural connections covered in the Specification for Structural Joints Using High-Strength Bolts, as approved by the Research Council on Structural Connections. 1.2.2 Bolts in this specification are furnished in sizes from 1 / 2 to 1- 1 / 2 in. inclusive and from M12 to M36 inclusive. 1.3 Classification, Table 1 : 1.3.1 Bolts are designated by grade, which indicates inch or metric strength and style. 1.3.2 Bolts are designated by type denoting raw material chemical composition. 1.3.3 Bolts are designated by style denoting Heavy Hex bolts or “Twist-Off” Style assemblies. 1.4 Terms used in this specification are defined in F1789 . 1.5 Units— 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. 1.6 Table footnotes are requirements. Notes are advisory. 1.7 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. 1.8 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.