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ISO 6621-2:2020
Internal combustion engines - Piston rings - Part 2: Inspection measuring principlesstandard by International Organization for Standardization, 03/01/2020
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ISO 6621-2:2020 defines the measuring principles to be used for measuring piston rings; it applies to piston rings up to and including 200 mm diameter for reciprocating internal combustion engines.
This document can be used for piston rings for compressors working under analogous conditions.