DIN 6923 — Hexagon nuts with flange — ISO 4161 or 1661 — sources disagree
What is the din standard for DIN 6923 — Hexagon nuts with flange — ISO 4161 or 1661 — sources disagree?
For DIN 6923, fastener description is Hexagon nuts with flange; iso equivalent is disputed: 4161 per fullerfasteners.com, 1661 per trfastenings.com; en iso number is 1661; date of current standard/modified is 1998-02; title of replacement standard is Hexagon nuts with flange, verified against its source on 2026-10-12.
Hexagon nuts with flange | 6923 | | 1661 | | 4161 | 1998-02 | Hexagon nuts with flange | Fine thread omitted to be included in a separate standard later); width across flat M10 changed |
— fullerfasteners.com, retrieved 2026-09-22
- DIN standard
- 6923 verified
- Fastener description
- Hexagon nuts with flange verified
- ISO equivalent
- 4161 sources disagree
- EN ISO number
- 1661 verified
- Date of current standard/modified
- 1998-02 verified
- Title of replacement standard
- Hexagon nuts with flange verified
- Modification notes
- Fine thread omitted to be included in a separate standard later); width across flat M10 changed sources disagree
- Interchangeability
- Check spec per monsterbolts.com
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.
ISO equivalent
fullerfasteners.com says iso equivalent is 4161, as of 2026-09-22.
Hexagon nuts with flange | 6923 | | 1661 | | 4161 | 1998-02 | Hexagon nuts with flange | Fine thread omitted to be included in a separate standard later); width across flat M10 changed |
https://fullerfasteners.com/tech/din-iso-en-crossover-chart/
trfastenings.com says iso equivalent is 1661, as of 2026-08-12.
DIN 6923 | ISO 1661 | | Hexagon Nuts with flange |
https://www.trfastenings.com/knowledge-base/engineering-data/fastener-standards
Modification notes
fullerfasteners.com says modification notes is Fine thread omitted to be included in a separate standard later); width across flat M10 changed, as of 2026-09-22.
Hexagon nuts with flange | 6923 | | 1661 | | 4161 | 1998-02 | Hexagon nuts with flange | Fine thread omitted to be included in a separate standard later); width across flat M10 changed |
https://fullerfasteners.com/tech/din-iso-en-crossover-chart/
monsterbolts.com says modification notes is Flange geometry/tolerance., as of 2026-09-21.
Hex Nut with Flange | DIN 6923 | DIN EN 1661 | Check spec | Flange geometry/tolerance.
https://monsterbolts.com/pages/common-din-numbers-for-metric-fasteners
Sources
- fullerfasteners.comhttps://fullerfasteners.com/tech/din-iso-en-crossover-chart/
- monsterbolts.comhttps://monsterbolts.com/pages/common-din-numbers-for-metric-fasteners
- trfastenings.comhttps://www.trfastenings.com/knowledge-base/engineering-data/fastener-standards