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

For 985, fastener description is Prevailing torque type hexagon thin nuts with non-metallic insert; iso equivalent is 10511; interchangeability is Height of nut changed; width across flat according to ISO 272 included; modification notes is Height of nut changed; width across flat according to ISO 272 included, verified against its source on 2026-08-12.

- **DIN standard:** 985 _(verified: appears in the quote below)_
- **Fastener description:** Prevailing torque type hexagon thin nuts with non-metallic insert _(verified: appears in the quote below)_
- **ISO equivalent:** 10511 _(verified: appears in the quote below)_
- **Interchangeability:** Height of nut changed; width across flat according to ISO 272 included _(verified: appears in the quote below)_
- **Modification notes:** Height of nut changed; width across flat according to ISO 272 included _(verified: appears in the quote below)_

## What the source says

> Prevailing torque type hexagon thin nuts with non-metallic insert | 985 | 10511 | | | 10511 | 1998-02 | Prevailing torque type hexagon, thin nuts (with non-metallic insert) | Height of nut changed; width across flat according to ISO 272 included |

## 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 **Prevailing torque type hexagon thin nuts with non-metallic insert**, as of 2026-08-12.

> Prevailing torque type hexagon thin nuts with non-metallic insert | 985 | 10511 | | | 10511 | 1998-02 | Prevailing torque type hexagon, thin nuts (with non-metallic insert) | Height of nut changed; width across flat according to ISO 272 included |

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

monsterbolts.com says fastener description is **Thin pattern; verify heights.**, as of 2026-08-12.

> DIN 985 | ISO 10511 | Check spec

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

trfastenings.com says fastener description is **Prevailing torque type Hexagon Thin Nuts with non-metallic insert**, as of 2026-08-12.

> DIN 985 | ISO 10511 | | Prevailing torque type Hexagon Thin Nuts with non-metallic insert |

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


### Interchangeability

fullerfasteners.com says interchangeability is **Height of nut changed; width across flat according to ISO 272 included**, as of 2026-08-12.

> Prevailing torque type hexagon thin nuts with non-metallic insert | 985 | 10511 | | | 10511 | 1998-02 | Prevailing torque type hexagon, thin nuts (with non-metallic insert) | Height of nut changed; width across flat according to ISO 272 included |

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

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

> DIN 985 | ISO 10511 | Check spec

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


## Source

- https://fullerfasteners.com/tech/din-iso-en-crossover-chart/
- https://monsterbolts.com/pages/common-din-numbers-for-metric-fasteners
- 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/).