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.

Preloadable bolting assemblies EN 14399 – HV & HR

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.

EN 14399 parts
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

Preload Fp,C = 0.7 fub As (EN 1993-1-8)
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.

Normes et exigences par marché

Les codes selon lesquels World Steel conçoit, fabrique et documente ce produit – et les principales exigences géométriques et de charge sur chaque marché.