DIN 931 vs ISO 4014 vs GB/T 5782
Hexagon Head Bolt
18of 22 diameters identical4differ — the spanner size only
Interchangeable except for the width across flats (the spanner size) — 8 recorded dimensions differ. ISO 4014 replaced DIN 931 as the current document.
M10 Across flats17 → 16 mmM10 Across corners18.9 → 17.77 mmM22 weightGB/T 5782 +6.7%
We produce to whichever standard your drawing calls out, DIN 931 included. ISO 4014 is the reference to specify on a new drawing.
What each number is
- DIN 931Superseded by ISO 4014
- Hex Head Bolt — Partially ThreadedEdition 1987 · 22 recorded sizes · M1.6 to M36
- ISO 4014Current
- Hexagon Head BoltEdition 2022 · 30 recorded sizes · M1.6 to M64
- GB/T 5782Current
- Hexagon Head BoltEdition 2025 · 30 recorded sizes · M1.6 to M64
Check your size
At M1.6 every recorded dimension is identical.
| DIN 931 | ISO 4014 | GB/T 5782 | |
|---|---|---|---|
| kgper 1000 pcs at 30 mm | 0.51 | 0.51 | 0.51 |
| RFQwe produce to the standard you name |
We produce to whichever standard your order names.
Where they differ
8 recorded values across 4 diameters. Every other diameter is listed identically in all of them.
| Size | Dimension | DIN 931 | ISO 4014 | GB/T 5782 |
|---|---|---|---|---|
| M10 | s · Width Across Flats | 17 | 16 | 16 |
| M10 | e · Width Across Corners | 18.9 | 17.77 | 17.77 |
| M12 | s · Width Across Flats | 19 | 18 | 18 |
| M12 | e · Width Across Corners | 21.1 | 20.03 | 20.03 |
| M14 | s · Width Across Flats | 22 | 21 | 21 |
| M14 | e · Width Across Corners | 24.49 | 23.36 | 23.36 |
| M22 | s · Width Across Flats | 32 | 34 | 34 |
| M22 | e · Width Across Corners | 35.72 | 37.72 | 37.72 |
Identical in 18 diameters— show them
M1.6M2M2.5M3M3.5M4M5M6M7M8M16M18M20M24M27M30M33M36
Differences on this page come from the TaurusFix confirmed dimension library, compared value by value and strictly against the standards themselves — not from a third-party equivalence chart.
Dimensions by sizeM6M8M10M12M16M20M24
ContinueHexagon Head Bolt supplied sizesDIN 931 standard pageAll comparisons