# DIN 972 — DIN / ISO / BS fastener equivalents and the sizes where they are not interchangeable

For DIN 972, iso standard is ISO 4034; part is M5 to M39 Hexagon Nuts; style 1; product grade C (modified version of ISO 4034), verified against its source on 2026-08-05.

- **DIN standard:** DIN 972 _(verified: appears in the quote below)_
- **ISO standard:** ISO 4034 _(verified: appears in the quote below)_
- **Part:** M5 to M39 Hexagon Nuts; style 1; product grade C (modified version of ISO 4034) _(verified: appears in the quote below)_

## What the source says

> DIN 972 | ISO 4034 | | M5 to M39 Hexagon Nuts; style 1; product grade C (modified version of ISO 4034) |

## Source

- https://www.trfastenings.com/knowledge-base/engineering-data/fastener-standards

Last verified: 2026-08-05. Review by: 2029-08-04.
Part of [DIN / ISO / BS fastener equivalents and the sizes where they are not interchangeable](https://referencesource.org/fastener-standard-interchangeability-exceptions/).