EN 14399 / EN 15048 High Strength Hex Bolt System
Structural-grade high strength hex bolt systems manufactured and tested in accordance with EN 14399 (HV/HR bolt-nut-washer assemblies) and EN 15048 (non-preloaded assemblies). Our facility was the first in China to obtain dual certification to both standards (2010).
Applications
- Steel structure construction (EN 1090 execution classes EXC1–EXC4)
- Industrial plant structures & pipe racks
- Bridge connections (preloaded & non-preloaded)
- Wind turbine tower & foundation connections
- Heavy equipment & machinery base plates
- Marine & offshore structural connections
Product Range
| System | Standard | Grade | Size | Key Feature |
|---|---|---|---|---|
| HV System (Preloaded) | EN 14399-1 to -6 | 10.9 | M12 – M36 | Controlled tightening, torque coefficient 0.11–0.15 |
| HR System (Preloaded) | EN 14399-1 to -6 | 10.9 | M12 – M36 | Direct tension indicator (DTI) or nut rotation method |
| Non-preloaded | EN 15048-1 / -2 | 8.8 / 10.9 | M12 – M36 | General structural bolting, no specific preload required |
| Hex Bolts (general) | ISO 4014 / ISO 4017 | 8.8 / 10.9 | M12 – M64 | Full / partial thread, per ISO 898-1 |
Mechanical Properties (Per ISO 898-1)
| Property Class | UTS (MPa) | Yield (MPa) | Hardness (HV) | Suitable Coatings |
|---|---|---|---|---|
| 8.8 | 800 | 640 | 250 – 320 | HDG, zinc flake, plain |
| 10.9 | 1040 | 940 | 320 – 380 | Zinc flake, Dacromet (HDG requires oversize thread) |
Standards Coverage
| Standard | Scope |
|---|---|
| EN 14399-1 | General requirements for HV & HR bolt assemblies |
| EN 14399-2 | Suitable nuts for use with HV/HR bolts |
| EN 14399-3 | System HR — hexagon fitted bolt assemblies |
| EN 14399-4 | System HV — hexagon head bolt & nut assemblies |
| EN 14399-5 | System HV — hexagon head bolt & nut with chamfered washer |
| EN 14399-6 | System HR — hexagon head bolt & nut assemblies |
| EN 15048-1 | Non-preloaded structural bolting assemblies — general requirements |
| EN 15048-2 | Non-preloaded — suitability testing |
| ISO 898-1 | Mechanical properties of fasteners — carbon & alloy steel |
Surface Treatment Options
- Hot-dip galvanized (HDG) — ISO 10684 / ASTM A153, ≥ 50 μm, for 8.8 grade (10.9 requires oversize thread compensation)
- Zinc flake coating — ISO 10683, no hydrogen embrittlement risk, preferred for 10.9
- Dacromet / Geomet — excellent corrosion resistance, low friction
- Phosphated + oiled — temporary protection, for further painting
- Plain (black) — indoor or painted structures
Quality Assurance
- In-house laboratory: OES spectrometry, 600 kN universal testing machine, hardness testers, salt spray chamber (1000H+)
- Torque coefficient testing for HV systems (per EN 14399-1, Annex A)
- Decarburization check (micro-hardness method)
- Wedge tension test per ISO 898-1
- Head quality test (impact & ductility)
- Dimensional inspection: thread gauge go/no-go, length, across-flats
- CE marking & DoC available for EN 1090 compliance
- MTC per EN 10204 Type 3.1 with every shipment
- Third-party inspection: SGS / BV / TÜV
Why Source From SINOFASTENER
SINOFASTENER is an integrated manufacturer and trader. Our capability is not limited to this catalog — custom materials, non-standard sizes, special coatings, project-specific drawings: if your project requires it, we manufacture and supply it.
- First in China with EN 14399 / EN 15048 dual certification (since 2010) — verified by notified body
- 50,000 tonnes annual capacity, 2,500 t/month — large project volume ready
- M12–M64 full range — one source for all structural fastener sizes
- Own packaging factory — custom palletization, fumigated crates, barcode labeling per your warehouse spec
- EU trade advantage:
- Anti-dumping duty: 39.6% (TARIC C824) vs. industry rate 86.5% (C999) — 46.9 percentage points lower
- CBAM measured carbon: 1.698 tCO₂/t vs. EU default 7.013 — 93.5% lower carbon tax cost
- Estimated CBAM saving: €400/t for carbon steel bolts vs. competitors
Packaging & Delivery
- Standard: export carton + pallet, 25 kg cartons
- Custom: wooden crate (fumigated ISPM-15), bulk bag, customer-branded packaging
- Anti-rust: VCI paper + PE bag + desiccant sachet
- Lead time: 15–25 days for standard items, 25–40 days for custom orders
Get Your Quote
Send us your BOM or drawing list. We return a full quotation with EN 14399/15048 certificate reference, test report scope, and FOB/CIF pricing within 24 hours.
Email:sales@sinofastener.com
Frequently Asked Questions
Q1: What is the difference between EN 14399 HV and HR bolt systems?
HV (Hexagon head bolt with Nut and chamfered Washer) uses torque control method with torque coefficient K = 0.11–0.15 per EN 14399-1 Annex A. HR (Hexagon fitted bolt with Nut) uses direct tension indicator (DTI) washers or nut rotation method. Both are Grade 10.9 preloaded assemblies, but installation procedures differ. We supply both systems with full torque coefficient test reports.
Q2: Can you supply EN 14399 certified bolts for EU steel structure projects?
Yes. SINOFASTENER was the first manufacturer in China to obtain dual EN 14399 / EN 15048 certification in 2010, verified by EU notified body. Every shipment includes CE marking, Declaration of Conformity (DoC), and Mill Test Certificate per EN 10204 Type 3.1. Our certificates are valid for EN 1090 structural steelwork execution classes EXC1–EXC4.
Q3: Do you provide torque coefficient test reports for HV bolts?
Yes. Every production lot undergoes torque coefficient testing per EN 14399-1 Annex A in our in-house laboratory. Test reports include individual bolt torque coefficient values (K), axial force, and nut rotation angle. Reports are shipped with MTC and available for third-party verification (SGS / BV / TÜV).
Q4: What size range and grades can you supply?
We supply M12–M64 in Grade 8.8 and 10.9 per ISO 898-1. EN 14399 systems (HV/HR) cover M12–M36. For sizes beyond M36 or special grades, contact us with your specification — we manufacture to order based on project requirements.
Q5: What is your EU anti-dumping duty rate?
SINOFASTENER (Ningbo Zhonglian Fastener Manufacturing Co., Ltd.) benefits from a 39.6% anti-dumping duty (TARIC code C824) under EU Regulation 2022/191, compared to the 86.5% rate for non-cooperative exporters (C999). This 46.9 percentage point advantage significantly reduces landed cost for EU buyers. CBAM carbon cost is also 93.5% lower than EU default values.
For complete product catalog and company information, visit www.sinofastener.com
