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

For 440, fastener description is Plain washers – Extra large series, product grade C; iso equivalent is 7094; interchangeability is Nominal sizes changed, nominal size 24 size “a” redefined to the maximum, square-end hole Form R omitted; (standard DIN 440 still valid); modification notes is Nominal sizes changed, nominal size 24 size “a” redefined to the maximum, square-end hole Form R omitted; (standard DIN 440 still valid), recorded from its source on 2026-08-12.

- **DIN standard:** 440 _(verified: appears in the quote below)_
- **Fastener description:** Plain washers – Extra large series, product grade C
- **ISO equivalent:** 7094 _(verified: appears in the quote below)_
- **Interchangeability:** Nominal sizes changed, nominal size 24 size “a” redefined to the maximum, square-end hole Form R omitted; (standard DIN 440 still valid)
- **Modification notes:** Nominal sizes changed, nominal size 24 size “a” redefined to the maximum, square-end hole Form R omitted; (standard DIN 440 still valid)

## What the source says

> 440 | 7094 |

## Sources disagree

More than one authority states this, and they do not state the same
thing. Both are reproduced with the source each came from.

### Fastener description

fullerfasteners.com says fastener description is **Plain washers – Extra large series, product grade C**, as of 2026-08-12.

> 440 | 7094 |

Source: https://fullerfasteners.com/tech/din-iso-en-crossover-chart/

trfastenings.com says fastener description is **Washers for use in timber constructions**, as of 2026-08-12.

> DIN 440 | ISO 7094 | | Washers for use in timber constructions |

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


## Source

- https://fullerfasteners.com/tech/din-iso-en-crossover-chart/
- 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/).