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

For 553, fastener description is Slotted set screws with cone point; iso equivalent is 7434; en iso number is 27434; interchangeability is No modifications of dimensions; modification notes is No modifications of dimensions, verified against its source on 2026-08-12.

- **DIN standard:** 553 _(verified: appears in the quote below)_
- **Fastener description:** Slotted set screws with cone point _(verified: appears in the quote below)_
- **ISO equivalent:** 7434 _(verified: appears in the quote below)_
- **EN ISO number:** 27434 _(verified: appears in the quote below)_
- **Interchangeability:** No modifications of dimensions _(verified: appears in the quote below)_
- **Modification notes:** No modifications of dimensions _(verified: appears in the quote below)_

## What the source says

> 553 | | 27434 | | 7434 | 1992-10 | Slotted set screws with cone point | No modifications of dimensions |

## 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 **Slotted set screws with cone point**, as of 2026-08-12.

> 553 | | 27434 | | 7434 | 1992-10 | Slotted set screws with cone point | No modifications of dimensions |

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

monsterbolts.com says fastener description is **Point geometry.**, as of 2026-08-12.

> DIN 553 | ISO 7434 | Check spec

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

trfastenings.com says fastener description is **Slotted Set Screws with cone point**, as of 2026-08-12.

> DIN 553 | ISO 7434 | | Slotted Set Screws with cone point |

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


### Interchangeability

fullerfasteners.com says interchangeability is **No modifications of dimensions**, as of 2026-08-12.

> 553 | | 27434 | | 7434 | 1992-10 | Slotted set screws with cone point | No modifications of dimensions |

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

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

> DIN 553 | ISO 7434 | 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/).