# DIN 963 — DIN / ISO / BS fastener equivalents and the sizes where they are not interchangeable

For DIN 963, iso standard is ISO 2009; part is Slotted Flat Head (Countersunk); interchangeability verdict is Check spec, verified against its source on 2026-08-05.

- **DIN standard:** DIN 963 _(verified: appears in the quote below)_
- **ISO standard:** ISO 2009 _(verified: appears in the quote below)_
- **Part:** Slotted Flat Head (Countersunk) _(verified: appears in the quote below)_
- **Interchangeability verdict:** Check spec _(verified: appears in the quote below)_
- **BS standard:** BS3692 _(per trfastenings.com, not stated by the source above)_

## What the source says

> Slotted Flat Head (Countersunk) | DIN 963 | ISO 2009 | Check spec | Countersink/head geometry differences.

## 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 Flat Head (Countersunk)**, as of 2026-08-05.

> Slotted Flat Head (Countersunk) | DIN 963 | ISO 2009 | Check spec | Countersink/head geometry differences.

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

trfastenings.com says part is **Slotted Countersunk Head Screws (with countersunk heads as specified in ISO 2009-1972)**, as of 2026-08-05.

> DIN 963 | ISO 2009 | BS3692 | Slotted Countersunk Head Screws (with countersunk heads as specified in ISO 2009-1972) |

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/).