Historical
ISO 6621-2:2003
Internal combustion engines - Piston rings - Part 2: Inspection measuring principles
ISO 6621-2:2003 specifies the principles to be used in the measuring for inspection purposes of piston rings for both reciprocating internal combustion engines and compressors working under analogous conditions. It is applicable to all such rings of a diameter greater than or equal to 200 mm.
International Organization for Standardization [iso]