DIN 6921 — Hexagon flange bolts — ISO 8102 or 1665 — sources disagree
What is the din standard for DIN 6921 — Hexagon flange bolts — ISO 8102 or 1665 — sources disagree?
For DIN 6921, fastener description is Hexagon flange bolts; iso equivalent is disputed: 8102 per fullerfasteners.com, 1665 per trfastenings.com; en iso number is 1665; date of current standard/modified is 1998-11; title of replacement standard is Hexagon bolts with flange, heavy series, verified against its source on 2026-10-12.
Hexagon flange bolts | 6921 | | 1665 | | 8102 | 1998-11 | Hexagon bolts with flange, heavy series | Dimensions partially changed; width across flats according to ISO 272; strength 12.9 omitted |
— fullerfasteners.com, retrieved 2026-09-22
- DIN standard
- 6921 verified
- Fastener description
- Hexagon flange bolts verified
- ISO equivalent
- 8102 sources disagree
- EN ISO number
- 1665 verified
- Date of current standard/modified
- 1998-11 verified
- Title of replacement standard
- Hexagon bolts with flange, heavy series verified
- Modification notes
- Dimensions partially changed; width across flats according to ISO 272; strength 12.9 omitted 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 8102, as of 2026-09-22.
Hexagon flange bolts | 6921 | | 1665 | | 8102 | 1998-11 | Hexagon bolts with flange, heavy series | Dimensions partially changed; width across flats according to ISO 272; strength 12.9 omitted |
https://fullerfasteners.com/tech/din-iso-en-crossover-chart/
trfastenings.com says iso equivalent is 1665, as of 2026-08-12.
DIN 6921 | ISO 1665 | | Hexagon Flange Bolts |
https://www.trfastenings.com/knowledge-base/engineering-data/fastener-standards
Modification notes
fullerfasteners.com says modification notes is Dimensions partially changed; width across flats according to ISO 272; strength 12.9 omitted, as of 2026-09-22.
Hexagon flange bolts | 6921 | | 1665 | | 8102 | 1998-11 | Hexagon bolts with flange, heavy series | Dimensions partially changed; width across flats according to ISO 272; strength 12.9 omitted |
https://fullerfasteners.com/tech/din-iso-en-crossover-chart/
monsterbolts.com says modification notes is Flange OD/serrations/tolerance windows., as of 2026-09-21.
Hex Head Bolts with Flange | DIN 6921 | DIN EN 1665 | Check spec | Flange OD/serrations/tolerance windows.
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