# 601 — Fastener standard equivalences: DIN to ISO / EN crossover

For 601, fastener description is Hexagon Bolts without Hexagon Nut – with Hexagon Nut, Type g; iso equivalent is 4016; 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, recorded from its source on 2026-08-12.

- **DIN standard:** 601 _(verified: appears in the quote below)_
- **Fastener description:** Hexagon Bolts without Hexagon Nut – with Hexagon Nut, Type g
- **ISO equivalent:** 4016 _(verified: appears in the quote below)_
- **Interchangeability:** Nominal size extended; width across flats according to DIN ISO 272 included _(verified: appears in the quote below)_
- **Modification notes:** Nominal size extended; width across flats according to DIN ISO 272 included _(verified: appears in the quote below)_

## What the source says

> 601 | 4016 | 24016 | 4016 | 4016 | 2001-03 | Hexagon head bolts – Product grade C | Nominal size extended; width across flats according to DIN ISO 272 included |

## 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.

### Fastener description

fullerfasteners.com says fastener description is **Hexagon Bolts without Hexagon Nut – with Hexagon Nut, Type g**, as of 2026-08-12.

> 601 | 4016 | 24016 | 4016 | 4016 | 2001-03 | Hexagon head bolts – Product grade C | Nominal size extended; width across flats according to DIN ISO 272 included |

Source: https://fullerfasteners.com/tech/din-iso-en-crossover-chart/

monsterbolts.com says fastener description is **Alt coarse hex PT.**, as of 2026-08-12.

> DIN 601 | ISO 4016 | Fully interchangeable

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

trfastenings.com says fastener description is **M5 to M52 Hexagon Head Bolts; product grade C**, as of 2026-08-12.

> DIN 601 | ISO 4016 | | M5 to M52 Hexagon Head Bolts; product grade C |

Source: 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.

> 601 | 4016 | 24016 | 4016 | 4016 | 2001-03 | Hexagon head bolts – Product grade C | Nominal size extended; width across flats according to DIN ISO 272 included |

Source: https://fullerfasteners.com/tech/din-iso-en-crossover-chart/

monsterbolts.com says interchangeability is **Fully interchangeable**, as of 2026-08-12.

> DIN 601 | ISO 4016 | Fully interchangeable

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


## Source

- https://fullerfasteners.com/tech/din-iso-en-crossover-chart/
- https://monsterbolts.com/pages/common-din-numbers-for-metric-fasteners
- https://www.trfastenings.com/knowledge-base/engineering-data/fastener-standards

Last verified: 2026-08-12. Review by: 2028-08-11.
Part of [Fastener standard equivalences: DIN to ISO / EN crossover](https://referencesource.org/fastener-thread-standard-equivalence/).