EN 1661 Hex Flange Nuts
EN 1661 is the European standard for hexagon flange nuts, which has superseded DIN 6923. These nuts feature an integrated flange that distributes clamping pressure over a wider area, eliminating the need for separate washers. The standard incorporates updated dimensional specifications, including revised widths across flats for certain sizes.
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Product introduction
EN 1661 is the European standard for hexagon flange nuts, which has superseded DIN 6923. These nuts feature an integrated flange that distributes clamping pressure over a wider area, eliminating the need for separate washers. The standard incorporates updated dimensional specifications, including revised widths across flats for certain sizes.
Common Specifications
| Materials | Carbon steel |
| Class | 5, 6, 8, 10 |
| Range | M3 – M20 |
| Thread | Coarse , Fine, Extra Fine, Special-Fine |
| Surface | Plain, zinc plated, hot-dip galvanized, GEOMET, ZINC-NICKLE, DACROMATE etc. |
Key Features
- Integrated flange for improved load distribution
- Supersedes DIN 6923 with updated dimensions
- M10 size features 16mm width across flats (was 15mm)
- No fine thread series under this standard
- Conforms to EN 1661 European specifications
Application industry
- European automotive manufacturing
- Industrial machinery assembly
- Construction equipment
- General engineering applications
data table
| Size | M1.6 | M2 | M2.5 | M3 | (M3.5) | M4 | M5 | M6 | M8 | M10 |
| Coase | 0.35 | 0.4 | 0.45 | 0.5 | 0.6 | 0.7 | 0.8 | 1 | 1.25 | 1.5 |
| Fine | - | - | - | 0.35 | - | 0.5 | 0.5 | 0.75 | 1 | 1.25 |
| Extra Fine | - | - | - | - | - | - | - | - | 0.75 | 1 |
| s Min (mm) | 2.90 | 3.70 | 4.70 | 5.20 | 5.70 | 6.64 | 7.64 | 9.64 | 12.57 | 15.57 |
| s Max (mm) | 3.20 | 4.00 | 5.00 | 5.50 | 6.00 | 7.00 | 8.00 | 10.00 | 13.00 | 16.00 |
| e Min (mm) | 3.28 | 4.18 | 5.31 | 5.88 | 6.44 | 7.50 | 8.63 | 10.89 | 14.20 | 17.59 |
| m Min (mm) | 1.00 | 1.20 | 1.60 | 1.80 | 2.00 | 2.20 | 2.70 | 3.20 | 4.00 | 5.00 |
| m Max (mm) | 0.75 | 0.95 | 1.35 | 1.55 | 1.75 | 1.95 | 2.45 | 2.90 | 3.70 | 4.70 |
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