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

For 125, fastener description is Normal vs chamfered faces; iso equivalent is 7089, 7090; interchangeability is Fully interchangeable, recorded from its source on 2026-08-12.

- **DIN standard:** 125 _(verified: appears in the quote below)_
- **Fastener description:** Normal vs chamfered faces.
- **ISO equivalent:** 7089, 7090 _(verified: appears in the quote below)_
- **Interchangeability:** Fully interchangeable _(verified: appears in the quote below)_

## What the source says

> DIN 125 | ISO 7089, 7090 | Fully interchangeable

## 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

monsterbolts.com says fastener description is **Normal vs chamfered faces.**, as of 2026-08-12.

> DIN 125 | ISO 7089, 7090 | Fully interchangeable

Source: https://monsterbolts.com/pages/common-din-numbers-for-metric-fasteners

trfastenings.com says fastener description is **Washers; medium type, primarily for hexagon bolts**, as of 2026-08-12.

> DIN 125 | ISO 7089 | | Washers; medium type, primarily for hexagon bolts | DIN 125 | ISO 7090 |

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

trfastenings.com says fastener description is **Washers; medium type, primarily for hexagon bolts**, as of 2026-08-12.

> DIN 125 | ISO 7089 | | Washers; medium type, primarily for hexagon bolts |

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


### ISO equivalent

monsterbolts.com says iso equivalent is **7089, 7090**, as of 2026-08-12.

> DIN 125 | ISO 7089, 7090 | Fully interchangeable

Source: https://monsterbolts.com/pages/common-din-numbers-for-metric-fasteners

trfastenings.com says iso equivalent is **7090**, as of 2026-08-12.

> DIN 125 | ISO 7089 | | Washers; medium type, primarily for hexagon bolts | DIN 125 | ISO 7090 |

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

trfastenings.com says iso equivalent is **7089**, as of 2026-08-12.

> DIN 125 | ISO 7089 | | Washers; medium type, primarily for hexagon bolts |

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


## Source

- https://monsterbolts.com/pages/common-din-numbers-for-metric-fasteners
- https://www.trfastenings.com/knowledge-base/engineering-data/fastener-standards
- 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/).