# DIN 555 — DIN / ISO / BS fastener equivalents and the sizes where they are not interchangeable

For DIN 555, iso standard is ISO 4034; part is M5 to M100x6 Hexagon Nuts - product grade C, verified against its source on 2026-08-05.

- **DIN standard:** DIN 555 _(verified: appears in the quote below)_
- **ISO standard:** ISO 4034 _(verified: appears in the quote below)_
- **Part:** M5 to M100x6 Hexagon Nuts - product grade C _(verified: appears in the quote below)_

## What the source says

> DIN 555 | ISO 4034 | | M5 to M100x6 Hexagon Nuts - product grade C |

## 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/).