DIN 558 — Hexagon screws, Thread Approximately to Head, Metric Thread, Type g — ISO 4018
What is the din standard for DIN 558 — Hexagon screws, Thread Approximately to Head, Metric Thread, Type g — ISO 4018?
For DIN 558, fastener description is Hexagon screws, Thread Approximately to Head, Metric Thread, Type g; iso equivalent is 4018; interchangeability is Nominal size extended; width across flats according to DIN ISO 272 included; modification notes is Nominal size extended; width across flats according to DIN ISO 272 included, verified against its source on 2026-08-12.
Hexagon screws, Thread Approximately to Head, Metric Thread, Type g | 558 | 4018 | 24018 | 4018 | 4018 | 2001-03 | Hexagon head screws – Product grade C | Nominal size extended; width across flats according to DIN ISO 272 included |
— fullerfasteners.com, retrieved 2026-08-12
- DIN standard
- 558 verified
- Fastener description
- Hexagon screws, Thread Approximately to Head, Metric Thread, Type g verified
- ISO equivalent
- 4018 verified
- Interchangeability
- Nominal size extended; width across flats according to DIN ISO 272 included verified
- Modification notes
- Nominal size extended; width across flats according to DIN ISO 272 included verified
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.
Fastener description
fullerfasteners.com says fastener description is Hexagon screws, Thread Approximately to Head, Metric Thread, Type g, as of 2026-08-12.
Hexagon screws, Thread Approximately to Head, Metric Thread, Type g | 558 | 4018 | 24018 | 4018 | 4018 | 2001-03 | Hexagon head screws – Product grade C | Nominal size extended; width across flats according to DIN ISO 272 included |
https://fullerfasteners.com/tech/din-iso-en-crossover-chart/
monsterbolts.com says fastener description is Alt coarse hex FT., as of 2026-08-12.
DIN 558 | ISO 4018 | Fully interchangeable
https://monsterbolts.com/pages/common-din-numbers-for-metric-fasteners
trfastenings.com says fastener description is Hexagon Head Screws, as of 2026-08-12.
DIN 558 | ISO 4018 | | Hexagon Head Screws |
https://www.trfastenings.com/knowledge-base/engineering-data/fastener-standards
Interchangeability
fullerfasteners.com says interchangeability is Nominal size extended; width across flats according to DIN ISO 272 included, as of 2026-08-12.
Hexagon screws, Thread Approximately to Head, Metric Thread, Type g | 558 | 4018 | 24018 | 4018 | 4018 | 2001-03 | Hexagon head screws – Product grade C | Nominal size extended; width across flats according to DIN ISO 272 included |
https://fullerfasteners.com/tech/din-iso-en-crossover-chart/
monsterbolts.com says interchangeability is Fully interchangeable, as of 2026-08-12.
DIN 558 | ISO 4018 | Fully interchangeable
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