M00000385
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ISO 6621-5 3rd Edition, October 1, 2013 Internal combustion engines - Piston rings - Part 5: Quality requirements
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Availability date: 07/13/2021
Description / Abstract:
This part of ISO 6621 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.e.
oil control rings in the form of strip steel components or steel
segments (rails) with spring expander components.
In addition to specifying certain of the limits of acceptance
relating to inspection measuring principles (covered by ISO
6621‑2), this part of ISO 6621 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.
This part of ISO 6621 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 2859 are followed.
This part of ISO 6621 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.