# DIN 439-1 — DIN / ISO / BS fastener equivalents and the sizes where they are not interchangeable

For DIN 439-1, iso standard is ISO 4036; part is Unchamfered Hexagon Thin Nuts - product grade B, verified against its source on 2026-08-05.

- **DIN standard:** DIN 439-1 _(verified: appears in the quote below)_
- **ISO standard:** ISO 4036 _(verified: appears in the quote below)_
- **Part:** Unchamfered Hexagon Thin Nuts - product grade B _(verified: appears in the quote below)_

## What the source says

> DIN 439-1 | ISO 4036 | | Unchamfered Hexagon Thin Nuts - product grade B |

## 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/).