TS ISO 6621-1

TS ISO 6621-1 is a terminology standard for piston rings used in internal combustion engines. A piston ring is a functional component that helps seal the combustion chamber, control oil, and transfer heat between the piston and the cylinder wall; this document focuses on the common technical language used to describe those rings and their characteristics.

What the vocabulary covers

This part of ISO 6621 defines the most commonly used terms for piston rings, including terms that identify ring types, certain characteristics, and related phenomena. The definitions apply to piston rings for reciprocating internal combustion engines. The same vocabulary may also be used for piston rings in compressors working under analogous conditions, which makes the terminology broadly useful in adjacent mechanical applications without turning this part into a design or testing standard.

Relationship to measurement and languages

The standard points users to ISO 6621-2 for additional terms covering measuring principles, so the present part should be read as the vocabulary foundation rather than a complete measurement manual. It also presents equivalents in German, Spanish, Portuguese, Italian, and Japanese in addition to the three official ISO languages. Only the terms given in the official languages are considered ISO terms.

In practice, controlled terminology supports clearer drawings, specifications, procurement documents, and maintenance instructions. For piston rings, that means designers, manufacturers, and service engineers can refer to the same concepts consistently when discussing ring types, characteristics, and behavior in engine operation.

• Covers piston-ring vocabulary for reciprocating internal combustion engines.
• May also be used for compressor piston rings under analogous conditions.
• Additional measuring-principle terms are given in ISO 6621-2.
• Includes non-official-language equivalents alongside the official ISO languages.
• This listing is for a withdrawn standard.