# ISO 521:1975 — Withdrawn and superseded ISO standards

For ISO 521:1975, item title is Machine chucking reamers with parallel shanks or Morse taper shanks; status code is 9599; successor is ISO 521:2011; withdrawn / published date is 1975-09-01, recorded from its source on 2026-08-05.

- **Identifier:** ISO 521:1975 _(verified: appears in the quote below)_
- **Item title:** Machine chucking reamers with parallel shanks or Morse taper shanks _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO 521:2011
- **Withdrawn / published date:** 1975-09-01 _(verified: appears in the quote below)_

## What the source says

> 4584,IS,,ISO 521:1975,Machine chucking reamers with parallel shanks or Morse taper shanks,"Alésoirs à machine, à queue cylindrique et à queue cône Morse",1975-09-01,1,['25.100.30'],ISO/TC 29/SC 9,9599,,[51322],"['en','fr']",5,"<p>Lays down only metric dimensions. For each type of reamer mentioned above ISO 521 gives two tables, one showing preferred sizes with corresponding dimensions and the other, a general table set out as functions of diameter steps. Provision is also made for tolerances on length, cutting diameters and the diameters of parallel shank.</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Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).