1.1 本规范涵盖了可压缩垫圈型直接张力指示器（DTI）的要求，该指示器能够指示结构螺栓组件中达到规定的最小张力。 1.2 标称直径尺寸的八种DTI 1. / 2. 到1 1. / 2. 英寸以及M16至M36都包括在内: 1.2.1 325-1型-- 与规范一起使用的DTI F3125 等级 A325 1型螺栓或等级 F1852 组件。 1.2.2 325–3型-- 与规范一起使用的DTI F3125 等级 A325 3型螺栓或等级 F1852 类型3组件。 1.2.3 490–1型-- 与规范一起使用的DTI F3125 等级 A490 1型螺栓或等级 F2280 组件。 1.2.4 490–3型-- 与规范一起使用的DTI F3125 等级 A490 3型螺栓等级 F2280 类型3组件。 1.2.5 8.8-1型-- 与规范一起使用的DTI F3125 等级 325万 1型螺栓。 1.2.6 8.8-3型-- 与规范一起使用的DTI F3125 等级 325万 类型3螺栓。 1.2.7 10.9-1型-- 与规范一起使用的DTI F3125 等级 490万 1型螺栓。 1.2.8 10.9-3型-- 与规范一起使用的DTI F3125 等级 490万 类型3螺栓。 1.3 DTI用于将突起安装在硬化表面上，如螺栓头、硬化螺母或硬化垫圈。（参见结构连接研究委员会:使用高强度螺栓的结构连接规范。） 1.4 本规范规定，根据制造商的判断，提供符合化学成分要求或耐腐蚀指数（CRI）的3型DTI。 1.5 本规范中使用的术语在术语中进行了定义 F1789 除非另有规定。 1.6 以国际单位制或英寸表示的数值- 磅单位应单独视为标准单位。每个系统中规定的值不一定是完全相等的；因此，为了确保符合标准，每个系统应独立使用，并且两个系统的值不得组合。 1.7 以下预防声明仅适用于第节中的试验方法部分 10 和 附录X1 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。 1.8 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 the requirements for compressible-washer-type direct tension indicators, (DTIs) capable of indicating the achievement of a specified minimum tension in a structural bolting assembly. 1.2 Eight types of DTIs in nominal diameter sizes 1 / 2 through 1 1 / 2 in. as well as M16 through M36 are covered: 1.2.1 Type 325-1— DTIs for use with Specification F3125 Grade A325 Type 1 bolts or Grade F1852 assemblies. 1.2.2 Type 325–3— DTIs for use with Specification F3125 Grade A325 Type 3 bolts or Grade F1852 Type 3 assemblies. 1.2.3 Type 490–1— DTIs for use with Specification F3125 Grade A490 Type 1 bolts or Grade F2280 assemblies. 1.2.4 Type 490–3— DTIs for use with Specification F3125 Grade A490 Type 3 bolts Grade F2280 Type 3 assemblies. 1.2.5 Type 8.8-1— DTIs for use with Specification F3125 Grade A325M Type 1 bolts. 1.2.6 Type 8.8-3— DTIs for use with Specification F3125 Grade A325M Type 3 bolts. 1.2.7 Type 10.9-1— DTIs for use with Specification F3125 Grade A490M Type 1 bolts. 1.2.8 Type 10.9-3— DTIs for use with Specification F3125 Grade A490M Type 3 bolts. 1.3 DTIs are intended for installation with the protrusions against a hardened surface such as a bolt head, a hardened nut, or a hardened washer. (See Research Council on Structural Connections: Specification for Structural Joints Using High–Strength Bolts.) 1.4 This specification provides for furnishing Type 3 DTIs to a Chemical Composition Requirement or a Corrosion Resistance Index (CRI) at the manufacturer’s discretion. 1.5 Terms used in this specification are defined in Terminology F1789 unless otherwise specified. 1.6 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. 1.7 The following precautionary statement pertains only to the test method portions, Section 10 and Appendix X1 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. 1.8 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.