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ISO 6621-4:2024

Internal combustion engines — Piston rings — Part 4: General specifications

General information

Valid from 01.05.2024
Directives or regulations
None

Standard history

Status
Date
Type
Name
01.05.2024
Main
18.03.2015
Main
This document specifies the general characteristics of piston rings for reciprocating internal combustion engines for road vehicles and other applications (the individual dimensional criteria for these rings are given in the relevant International Standards). It also provides a system for ring coding, designation, and marking. It is applicable to all such rings of a nominal diameter from 30 mm up to and including 200 mm.

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