# ISO 6624-4:2003 — Withdrawn and superseded ISO standards

For ISO 6624-4:2003, item title is Internal combustion engines — Piston rings — Part 4: Half keystone rings made of steel; status code is 9599; successor is ISO 6624-4:2016; withdrawn / published date is 2003-10-01, recorded from its source on 2026-08-05.

- **Identifier:** ISO 6624-4:2003 _(verified: appears in the quote below)_
- **Item title:** Internal combustion engines — Piston rings — Part 4: Half keystone rings made of steel _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO 6624-4:2016
- **Withdrawn / published date:** 2003-10-01 _(verified: appears in the quote below)_

## What the source says

> 27930,IS,,ISO 6624-4:2003,Internal combustion engines — Piston rings — Part 4: Half keystone rings made of steel,Moteurs à combustion interne — Segments de piston — Partie 4: Segments semi-trapézoïdaux en acier,2003-10-01,1,['43.060.10'],ISO/TC 22/SC 34,9599,,[59243],['en'],18,"<p>ISO 6624-4:2003 specifies the essential dimensional features of half keystone rings made of steel, types HK and HKB, having diameters of from 38 mm up to and including 160 mm, used in reciprocating internal combustion piston engines.</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Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).