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Estados Unidos
- HR 8.8 / 10.9 (EN 14399-3) and HV 10.9 (EN 14399-4)
- M12 – M36, heavy hex heads
- k-class K1 or K2 for the torque method
- CE marked as a complete assembly
- Washers EN 14399-5 / -6
- For EN 1090-2 EXC2 – EXC4
What it is
EN 14399 defines preloadable structural bolting assemblies sold and CE marked as a set: bolt, nut and washers from one manufacturer and lot. System HR has a long thread and full-strength nut; system HV (common in Germany) has a shorter thread and relies on a controlled nut stripping mode. They must not be mixed.
| Part | Content |
|---|---|
| EN 14399-1 | General requirements, CE marking |
| EN 14399-2 | Suitability test for preloading |
| EN 14399-3 | System HR – hexagon bolt and nut 8.8 / 10.9 |
| EN 14399-4 | System HV – hexagon bolt and nut 10.9 |
| EN 14399-5 / -6 | Plain and chamfered washers |
| EN 14399-9 | Direct tension indicators (HRD / HVD) |
| EN 14399-10 | System HRC – tension control bolts |
Preload
| Size | M16 | M20 | M24 | M30 | M36 |
|---|---|---|---|---|---|
| 8.8 (kN) | 88 | 137 | 198 | 314 | 458 |
| 10.9 (kN) | 110 | 172 | 247 | 393 | 572 |
Tightening by the torque method, the combined method, HRC bolts or DTIs per EN 1090-2. The k-class (K0, K1, K2) printed on the box tells the installer which methods the lot is qualified for.
Slip-resistant connections
Categories B and C (slip-resistant) use preloaded 8.8 or 10.9 assemblies with a controlled faying surface class – World Steel masks or treats the contact surfaces in the shop to the class on the drawings.
Normas y requisitos por mercado
Códigos con los que World Steel diseña, fabrica y documenta este producto, y los principales requisitos geométricos y de carga en cada mercado.
Europa
- EN 14399Preloadable structural bolting assemblies
- EN 1090-2 Certificación WSCExecution – bolting and tightening
- EN 1993-1-8Design of joints
- ISO 10684Hot-dip galvanized fasteners
- CE marking
- DoP per assembly lot
Resumen solo orientativo: prevalecen la especificación del proyecto, la edición del código adoptada y la autoridad competente.
Acabados
| Acabado | Normas / notas |
|---|---|
| Plain / black | Oiled, for painted or indoor connections |
| Hot-dip galvanized | ISO 10684, nuts oversize tapped and lubricated |
Preguntas frecuentes
Can I use an HR nut on an HV bolt?
No. HR and HV are separate systems – bolt, nut and washers must come from the same EN 14399 set and lot.
Germany
