# ISO 7181:1991 — Withdrawn and superseded ISO standards

For ISO 7181:1991, item title is Hydraulic fluid power — Cylinders — Bore and rod area ratios; status code is 9599; successor is ISO 3320:2013 | ISO/WD 7181; withdrawn / published date is 1991-10-10, recorded from its source on 2026-08-05.

- **Identifier:** ISO 7181:1991 _(verified: appears in the quote below)_
- **Item title:** Hydraulic fluid power — Cylinders — Bore and rod area ratios _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO 3320:2013 | ISO/WD 7181
- **Withdrawn / published date:** 1991-10-10 _(verified: appears in the quote below)_

## What the source says

> 13796,IS,,ISO 7181:1991,Hydraulic fluid power — Cylinders — Bore and rod area ratios,Transmissions hydrauliques — Vérins — Rapports entre surfaces d'alésage et de tige,1991-10-10,2,['23.100.20'],ISO/TC 131/SC 3,9599,[13795],"[61647,36110]","['en','fr']",3,<p>Specifies for each pair of diameters (AL = cylinder bore; MM = piston rod diameter) of cylinders a corresponding standard ratio between the useful areas A<sub>1</sub> and A<sub>2</sub>. This second edition cancels and replaces the first edition (1982).</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Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).