# ISO 6621-4:2003 — Withdrawn and superseded ISO standards

For ISO 6621-4:2003, item title is Internal combustion engines — Piston rings — Part 4: General specifications; status code is 9599; successor is ISO 6621-4:2015; withdrawn / published date is 2003-10-14, recorded from its source on 2026-08-05.

- **Identifier:** ISO 6621-4:2003 _(verified: appears in the quote below)_
- **Item title:** Internal combustion engines — Piston rings — Part 4: General specifications _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO 6621-4:2015
- **Withdrawn / published date:** 2003-10-14 _(verified: appears in the quote below)_

## What the source says

> 38306,IS,,ISO 6621-4:2003,Internal combustion engines — Piston rings — Part 4: General specifications,Moteurs à combustion interne — Segments de piston — Partie 4: Spécifications générales,2003-10-14,2,['43.060.10'],ISO/TC 22,9599,[13036],[59170],['en'],28,"<p>ISO 6621-4:2003 specifies the general characteristics of piston rings for both reciprocating internal combustion engines and compressors (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 diameter greater than or equal to 200 mm.</p>"

## Source

- https://isopublicstorageprod.blob.core.windows.net/opendata/_latest/iso_deliverables_metadata/csv/iso_deliverables_metadata.csv

Last verified: 2026-08-05. Review by: 2027-02-01.
Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).