At Ananka Fasteners Pvt Ltd, we manufacture and supply fasteners certified to EN 14399-4. EN 14399-4 ‘High-strength structural bolting assemblies for preloading – Part 4: System HV – Hexagon bolt and nut assemblies’. Specifies the HV (short-thread, reduced height nut) preloadable assembly for steel structures, used with EN 14399-1/-2 and washers EN 14399-6. Property classes 10.9 (bolt)/10 (nut) and 8.8/8. CE/UKCA marked.
EN 14399-4 ‘High-strength structural bolting assemblies for preloading – Part 4: System HV – Hexagon bolt and nut assemblies’. Specifies the HV (short-thread, reduced height nut) preloadable assembly for steel structures, used with EN 14399-1/-2 and washers EN 14399-6. Property classes 10.9 (bolt)/10 (nut) and 8.8/8. CE/UKCA marked.
| Grade / Class | UNS / Designation | Type / Notes |
|---|---|---|
| Bolt class 10.9 (HV) | EN ISO 898-1 | Q&T alloy/carbon steel |
| Nut class 10 (HV) | EN ISO 898-2 | Reduced-height HV nut |
| Bolt class 8.8 (HV) | EN ISO 898-1 | Q&T carbon steel |
| Nut class 8 (HV) | EN ISO 898-2 | HV nut |
| Washer HV | EN 14399-6 | Hardened chamfered washer |
Minimum mechanical requirements per EN 14399-4.
| Grade / Class / Condition | Tensile Strength, min | Yield Strength, min | Elongation, min % | Hardness |
|---|---|---|---|---|
| Bolt class 10.9 | 145 (1000 min) | 131 (900) | 9 | 320-380 HV |
| Bolt class 8.8 | 116 (800 min) | 93 (640) | 12 | 250-320 HV |
| Nut class 10 (HV) | proof load to match 10.9 | – | – | <=353 HV |
| Nut class 8 (HV) | proof load to match 8.8 | – | – | <=302 HV |
| Grade | Key Composition, % |
|---|---|
| Class 10.9 bolt | Q&T alloy steel (e.g. 34Cr4/42CrMo4-type) per ISO 898-1, B <=0.003, P <=0.025, S <=0.025 |
| Class 8.8 bolt | C or C-B/Q&T steel per ISO 898-1 |
HV system is the German/European counterpart to the HR system (EN 14399-3). Broadly comparable in strength to ASTM F3125 Gr A325/A490 heavy hex structural bolts; property classes per ISO 898-1/-2.
For the official CEN (European Committee for Standardization) standards catalogue, see the CEN (European Committee for Standardization) standards listing. This external reference is provided for standards identification; the purchaser should verify the current edition applicable to the order.
We supply EN 14399-4 fasteners — bolts, screws, studs, nuts and washers as applicable — for energy, petrochemical, marine, structural and general engineering service, in a full range of sizes and finishes.
For technical documentation and quotations, buyers can also review the Ananka Fasteners manufacturing and supply range or contact the team through the fastener enquiry and technical support page.
Ananka Fasteners supplies every lot with full material traceability and third-party testing on request.
EN 14399-4 ‘High-strength structural bolting assemblies for preloading – Part 4: System HV – Hexagon bolt and nut assemblies’. Specifies the HV (short-thread, reduced height nut) preloadable assembly for steel structures, used with EN 14399-1/-2 and washers EN 14399-6. Property classes 10.9 (bolt)/10 (nut) and 8.8/8. CE/UKCA marked.
Ananka Fasteners supplies Bolt class 10.9 (HV), Nut class 10 (HV), Bolt class 8.8 (HV), Nut class 8 (HV), Washer HV to EN 14399-4. See the Grades / Classes Covered table above for full details of each grade.
Minimum tensile strength, yield strength, elongation and hardness requirements vary by grade — see the Mechanical Properties table above for the complete breakdown.
We supply EN 14399-4 fasteners — bolts, screws, studs, nuts and washers as applicable — for energy, petrochemical, marine, structural and general engineering service, in a full range of sizes and finishes.
Yes. For a quotation, provide the required fastener type, grade, nominal size, dimensional standard, quantity and any inspection or certificate requirements.
Need a fastener released to EN 14399-4 for an industrial project? Send the required fastener type, grade, size, quantity and certification requirements to Ananka Fasteners. Our team can review the requirement and provide technical and commercial information for standard or custom configurations.
Recommended RFQ details: EN 14399-4 requirement, material grade, fastener type, nominal size, dimensional standard, quantity, inspection requirements and EN 10204 certificate requirements where applicable.
Data compiled per EN 14399-4 and industry references; provided for reference only — confirm against the current edition of the standard and certified mill test reports before design use.
