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الولايات المتحدة
- 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.
المعايير والمتطلبات حسب السوق
المعايير التي تصمم World Steel هذا المنتج وتصنّعه وتوثّقه وفقها – والمتطلبات الهندسية الرئيسية ومتطلبات الأحمال في كل سوق.
أوروبا
- EN 14399Preloadable structural bolting assemblies
- EN 1090-2 معتمد لدى WSCExecution – bolting and tightening
- EN 1993-1-8Design of joints
- ISO 10684Hot-dip galvanized fasteners
- CE marking
- DoP per assembly lot
ملخص للاسترشاد فقط – تسري مواصفات المشروع وإصدار المعيار المعتمد والجهة المختصة.
التشطيبات
| التشطيب | المعايير / ملاحظات |
|---|---|
| Plain / black | Oiled, for painted or indoor connections |
| Hot-dip galvanized | ISO 10684, nuts oversize tapped and lubricated |
الأسئلة المتكررة
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
