# 972 — Fastener standard equivalences: DIN to ISO / EN crossover

For 972, fastener description is M5 to M39 Hexagon Nuts; style 1; product grade C (modified version of ISO 4034); iso equivalent is 4034, verified against its source on 2026-08-12.

- **DIN standard:** 972 _(verified: appears in the quote below)_
- **Fastener description:** M5 to M39 Hexagon Nuts; style 1; product grade C (modified version of ISO 4034) _(verified: appears in the quote below)_
- **ISO equivalent:** 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: 2026-08-12. Review by: 2028-08-11.
Part of [Fastener standard equivalences: DIN to ISO / EN crossover](https://referencesource.org/fastener-thread-standard-equivalence/).