# DIN 553 — DIN / ISO / BS fastener equivalents and the sizes where they are not interchangeable

For DIN 553, iso standard is ISO 7434; part is Slotted Set Screw – Cone; interchangeability verdict is Check spec, verified against its source on 2026-08-05.

- **DIN standard:** DIN 553 _(verified: appears in the quote below)_
- **ISO standard:** ISO 7434 _(verified: appears in the quote below)_
- **Part:** Slotted Set Screw – Cone _(verified: appears in the quote below)_
- **Interchangeability verdict:** Check spec _(verified: appears in the quote below)_

## What the source says

> Slotted Set Screw – Cone | DIN 553 | ISO 7434 | Check spec | Point geometry.

## 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.

### Part

monsterbolts.com says part is **Slotted Set Screw – Cone**, as of 2026-08-05.

> Slotted Set Screw – Cone | DIN 553 | ISO 7434 | Check spec | Point geometry.

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

trfastenings.com says part is **Slotted Set Screws with cone point**, as of 2026-08-05.

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

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

Last verified: 2026-08-05. Review by: 2029-08-04.
Part of [DIN / ISO / BS fastener equivalents and the sizes where they are not interchangeable](https://referencesource.org/fastener-standard-interchangeability-exceptions/).