1.1 本规范涵盖了紧固件六级防腐的基本要求。A级由不含额外密封剂（干）的重磷酸锌涂层组成，B级由含干有机密封剂的重磷酸锌涂层组成，C级由含补充干触油型化合物的重磷酸锌涂层组成，D级由含补充保护油型化合物的重磷酸锌涂层组成，E级由晶粒细化微晶磷酸锌和补充油型化合物组成，F级由磷酸锰涂层和补充油型化合物组成。 1.2 本规范主要适用于需要防腐和润滑的紧固件，如螺母、夹子、垫圈和其他含铁螺纹和非螺纹紧固件。 1.3 这些涂层可能有也可能没有装饰饰面。 1.4 以国际单位制或英寸-磅单位表示的数值应单独视为标准值。每个系统中规定的值可能不是精确的等效值；因此，每个系统应相互独立使用。将两个系统的值合并可能会导致不符合标准。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）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》中确立的国际公认标准化原则制定的。

1.1 This specification covers the basic requirements for six grades of corrosion protection for fasteners. Grade A consists of a heavy zinc phosphate coating with no additional sealer (dry), Grade B consists of a heavy zinc phosphate coating with a dry organic sealer, Grade C consists of a heavy zinc phosphate coating with supplemental dry-to-touch oil type compound, Grade D consists of a heavy zinc phosphate coating with supplemental protective oil type compound, Grade E consists of a grain-refined microcrystalline zinc phosphate with supplemental oil type compound, and Grade F consists of a manganese phosphate coating with supplemental oil type compound. 1.2 This specification is intended primarily for fasteners such as nuts, clips, washers, and other ferrous threaded and non-threaded fasteners that require corrosion protection and lubrication. 1.3 These coatings may or may not have a decorative finish. 1.4 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. 1.5 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.