EN 14399 Structural Bolting - HR and HV Systems
EN 14399 is the European standard for preloaded structural bolting. It defines matched bolt, nut and washer assemblies in two main systems, HR and HV, in property classes 8.8 and 10.9.
| Assemblies | Bolt, nut and washer supplied as a set, from one manufacturer |
|---|---|
| k-class | K0 / K1 / K2 torque-tension characterization |
Main parts of EN 14399
| Part | Covers |
|---|---|
| -1 | General requirements |
| -2 | Suitability test for preloading |
| -3 | System HR: hexagon bolt and nut assemblies |
| -4 | System HV: hexagon bolt and nut assemblies |
| -5 / -6 | Plain washers / chamfered washers |
| -7 / -8 | HR countersunk bolts / HV fit bolts |
| -9 | HR or HV with direct tension indicators |
| -10 | HRC tension-control assemblies |
HR vs HV
| HR | HV | |
|---|---|---|
| Origin | UK / French practice | German practice |
| Thread length | Longer | Shorter |
| Ductility from | Bolt elongation | Nut thread deformation |
| Classes | 8.8 and 10.9 | 10.9 |
| Marking | HR + class + maker | HV + class + maker |
These tables carry the same figures as the printed sheet below.
The printed sheet
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Text version of this sheet
EN 14399 · European high-strength structural bolting assemblies for preloading
What it is
FIELD IDENTIFICATION
EN 14399 is the European standard for preloaded structural bolting. It defines matched bolt, nut and
washer assemblies in two main systems, HR and HV, in property classes 8.8 and 10.9.
MFG
MFG
HR
HV
HR (UK style)
Assemblies
Bolt, nut and washer supplied as a set, from one manufacturer
k-class
K0 / K1 / K2 torque-tension characterization
HV (German style)
HR and HV are different systems
Main parts of EN 14399
Part
Covers
-1
General requirements
-2
Suitability test for preloading
-3
System HR: hexagon bolt and nut assemblies
-4
System HV: hexagon bolt and nut assemblies
-5 / -6
Plain washers / chamfered washers
-7 / -8
HR countersunk bolts / HV fit bolts
-9
HR or HV with direct tension indicators
-10
HRC tension-control assemblies
HR vs HV
HR
HV
Origin
UK / French practice
German practice
Thread length
Longer
Shorter
Ductility from
Bolt elongation
Nut thread deformation
Classes
8.8 and 10.9
10.9
Marking
HR + class + maker
HV + class + maker
Key points
HR and HV components are not interchangeable with each other or with ASTM F3125 parts.
Installation follows EN 1090-2 in Europe.
Governing standards: EN 14399-1 to -10; EN 1090-2. Editions shown are the latest confirmed as of September 2026. The drawing and the governing standard always take
precedence over this sheet.
torquing any fastener. Verify the current governing standard, project documents, OEM requirements, size, thread, coating and lot certification. To the fullest extent permitted by law, The Fastener App disclaims liability
arising from reliance on this reference.
Fastener Guide reference FG-5335CC · thefastenerapp.com/fastener-guide/technical-reference/en-14399-structural-bolting-hr-hv · © The Fastener App. Reference only — verify the current governing standard, drawing and manufacturer data before specifying or installing.
