439

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 — deciding between them is yours, not ours.

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

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

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 |

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

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 |

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 |

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

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

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 |

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

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 |

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 |

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

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

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

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