Internal combustion engines — Piston rings — Part 5: Quality requirements This standard has been revised by ISO Abstract ISO specifies those quality aspects that are capable of definition but not normally found on a drawing specification. It is applicable to 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; single-piece and multi-piece oil control rings of steel, i. In addition to specifying certain of the limits of acceptance relating to inspection measuring principles covered by ISO , ISO also covers those features for which no recognized quantitative measurement procedures exist and which are only checked visually with normal eyesight spectacles 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. ISO does not establish acceptable quality levels AQL , it being left to manufacturer and client to decide the appropriate levels jointly. In this case, the recommendations of ISO are followed.
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