ISO 6621-5:2005
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Internal combustion engines -- Piston rings -- Part 5: Quality requirements

This standard has been revised by: ISO 6621-5:2013


ISO 6621-5:2005 specifies those quality aspects of piston rings that are capable of definition but 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;
  • 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.


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