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

For 439, fastener description is Chamfered/unchamfered covered by ISO pair; iso equivalent is 4035, 4036; interchangeability is Fully interchangeable, recorded from its source on 2026-08-12.

- **DIN standard:** 439 _(verified: appears in the quote below)_
- **Fastener description:** Chamfered/unchamfered covered by ISO pair.
- **ISO equivalent:** 4035, 4036 _(verified: appears in the quote below)_
- **Interchangeability:** Fully interchangeable _(verified: appears in the quote below)_

## What the source says

> DIN 439 | ISO 4035, 4036 | 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 **Chamfered/unchamfered covered by ISO pair.**, as of 2026-08-12.

> DIN 439 | ISO 4035, 4036 | Fully interchangeable

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

monsterbolts.com says fastener description is **Fine thread thin nut.**, as of 2026-08-12.

> DIN 439 | ISO 8675 | Fully interchangeable

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

trfastenings.com says fastener description is **Hexagon Thin Nuts**, as of 2026-08-12.

> DIN 439 | ISO 4035 | BS3692 | Hexagon Thin Nuts | DIN 439 | ISO 4036 |

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

monsterbolts.com says fastener description is **Edge prep varies; check bearing face.**, as of 2026-08-12.

> DIN 439 | ISO 4036 | Check spec

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

trfastenings.com says fastener description is **Hexagon Thin Nuts**, as of 2026-08-12.

> DIN 439 | ISO 4035 | BS3692 | Hexagon Thin Nuts | DIN 439 | ISO 4036 | BS3692 | Hexagon Thin Nuts | DIN 439 | ISO 8675 |

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

trfastenings.com says fastener description is **Hexagon Thin Nuts**, as of 2026-08-12.

> DIN 439 | ISO 4035 | BS3692 | Hexagon Thin Nuts |

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


### ISO equivalent

monsterbolts.com says iso equivalent is **4035, 4036**, as of 2026-08-12.

> DIN 439 | ISO 4035, 4036 | Fully interchangeable

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

monsterbolts.com says iso equivalent is **8675**, as of 2026-08-12.

> DIN 439 | ISO 8675 | Fully interchangeable

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

trfastenings.com says iso equivalent is **4036**, as of 2026-08-12.

> DIN 439 | ISO 4035 | BS3692 | Hexagon Thin Nuts | DIN 439 | ISO 4036 |

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

monsterbolts.com says iso equivalent is **4036**, as of 2026-08-12.

> DIN 439 | ISO 4036 | Check spec

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

trfastenings.com says iso equivalent is **8675**, as of 2026-08-12.

> DIN 439 | ISO 4035 | BS3692 | Hexagon Thin Nuts | DIN 439 | ISO 4036 | BS3692 | Hexagon Thin Nuts | DIN 439 | ISO 8675 |

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

trfastenings.com says iso equivalent is **4035**, as of 2026-08-12.

> DIN 439 | ISO 4035 | BS3692 | Hexagon Thin Nuts |

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


### Interchangeability

monsterbolts.com says interchangeability is **Fully interchangeable**, as of 2026-08-12.

> DIN 439 | ISO 4035, 4036 | Fully interchangeable

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

monsterbolts.com says interchangeability is **Fully interchangeable**, as of 2026-08-12.

> DIN 439 | ISO 8675 | Fully interchangeable

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

monsterbolts.com says interchangeability is **Check spec**, as of 2026-08-12.

> DIN 439 | ISO 4036 | Check spec

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


## 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
- 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/).