本文件规定了可以定义但通常在图纸规范中找不到的质量方面。 它包括以下内容: -灰铸铁或钢制单件活塞环； -由铸铁零件和弹簧组件组成的多件式活塞环（控油环）；和 -单件式和多件式钢制控油环，即带钢部件或带弹簧膨胀部件的钢段（轨道）形式的控油环。 除了规定与检验测量原则（ISO 6621？2涵盖）有关的一些验收限制外，本文件还涵盖了那些不存在公认的定量测量程序且仅在正常视力（正常佩戴的眼镜）和无放大率的情况下进行目视检查的特征。 这些特征（表面缺陷）是环宽、径向壁厚和闭合间隙标准公差的补充。 本文件未建立可接受的质量水平（AQL），由制造商和客户共同决定合适的水平。在这种情况下，遵循ISO 2859-1的建议。 本文件规定了道路车辆和其他应用用往复式内燃机活塞环的质量要求。适用于标称直径为30 mm至200 mm（含）的所有此类环。

This document specifies quality aspects that can be defined but that are not normally found on a drawing specification. It covers the following: — single？piece piston rings of grey cast iron or steel; — multi？piece piston rings (oil control rings) consisting of cast iron parts and spring components; and — single？piece and multi？piece oil control rings of steel, i.e. oil control rings in the form of strip steel components or steel segments (rails) with spring expander components. In addition to specifying some of the limits of acceptance relating to inspection measuring principles (covered by ISO 6621？2), this document also covers those features for which no recognized quantitative measurement procedures exist and which are only checked visually with normal eyesight (glasses if worn normally) and without magnification. Such features (superficial defects) are additional to the standard tolerances of ring width, radial wall thickness and closed gap. This document does not establish acceptable quality levels (AQL), it being left to manufacturer and customer to decide the appropriate levels jointly. In this case, the recommendations of ISO 2859？1 are followed. This document specifies the quality requirements of piston rings for reciprocating internal combustion engines for road vehicles and other applications. It is applicable to all such rings of a nominal diameter from 30 mm up to and including 200 mm.