ISO 6621-1:2018

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ISO 6621-1:2018 is an international standard that defines the terms used to describe piston rings for internal combustion engines. It also applies to piston rings for compressors that operate under similar conditions. 

ISO 6621-1:2018 defines the most commonly used terms for piston rings. These terms designate either types of piston rings or certain characteristics and phenomena of piston rings. The terms and definitions in this document apply to piston rings for reciprocating internal combustion engines..