EN 14399-3 HR Grade 8.8 Specifications
Parameter | Details |
Product Name | EN14399-3 System HR Grade 8.8 Structural Bolt Assembly |
Standard | EN 14399-1, EN 14399-3 European Standard |
System Type | HR Preloaded Structural Bolt System |
Grade | Bolt 8.8 / Nut 8 (HR8.8/8) |
Size Range | M12-M36 Full Sizes In Stock, Custom Length Available |
Components | HR Hex Bolt + HR Special Nut + EN14399-5/6 Hardened Washer |
Surface Finish | Black Oxide, Hot-dip Galvanized, Dacromet |
Feature | Stable Preload, Anti-slip, Anti-vibration, Fatigue Resistant |
Application | Steel Structure Workshop, Bridge, Building Frame, Overseas Construction Project |
Marking | HR8.8, HR8, H Standard Engraved Mark |
Quality Control | Tensile, Hardness, Torque Coefficient, Preload Full Inspection |
Package | Export Carton + Pallet, Neutral Packaging Supported |
Supply Capacity | Mass Stock, Bulk Order & Custom Processing Available |
Product Core Advantages
Complete European Standard System
EN14399-3 HR system bolt assembly is a standardized complete fastener solution. All components are strictly matched in accordance with EU standards, fully compliant with Eurocode3 steel structure specifications. Clear standard marking and complete test reports support strict overseas engineering acceptance, which ordinary bolt sets cannot replace.
Professional quenching and tempering treatment ensures stable torque coefficient and uniform preload force. It effectively prevents connection slip and structural deformation under dynamic load, vibration and temperature change, greatly improving the overall rigidity and safety of steel structure nodes.
Hardened Matching Washers
Matched EN14399-5/6 H-mark hardened washers feature high compression resistance and wear resistance. They evenly disperse pressure and avoid surface collapse and stress concentration, ensuring long-term stable connection performance of structural nodes.
Multi-scenario Anti-corrosion Solution
Multiple surface treatments meet different environmental requirements. Black finish for indoor steel structures, hot-dip galvanized for outdoor weather resistance, and Dacromet for corrosive environments, ensuring long service life of fasteners in overseas complex working conditions.
Production Process
High-quality Alloy Raw Material: Stable mechanical properties for structural engineering.
Precision Hot Forging: Regular hex head and integrated stable structure.
Precision Thread Rolling: Standard thread profile with 100% gauge pass rate.
Professional Heat Treatment: Grade 8.8 quenching and tempering for balanced strength and toughness.
Standard Marking Engraving: Clear HR grade and standard identification.
Custom Anti-corrosion Treatment: Multiple finishes for different projects.
Full Performance Inspection: Strict testing to ensure project qualification.
Application Industries
European Standard Steel Workshop: Frame and beam connection for overseas steel construction.
Bridge Structural Engineering: Load-bearing node fastening for municipal and highway bridges.
Heavy Equipment Support: Base fixing for generator sets and large machinery.
Building Curtain Wall Structure: High-rise steel structure enclosure connection.
Overseas Infrastructure Project: Supporting fasteners for international steel structure projects.
Steel Structure Renovation: Reinforcement and replacement of structural nodes.
Why Choose Our EN14399-3 HR8.8 Bolt Sets
We are a professional manufacturer of EN standard steel structure fasteners. All EN14399-3 HR system 8.8 grade preloaded bolt assemblies are produced in strict accordance with EU standards, with complete specifications and sufficient stock. We provide complete material certificates, torque coefficient test reports, mechanical property inspection reports and salt spray test reports, support bulk export orders and customized production, delivering reliable and compliant fastening solutions for global steel structure engineering.
Installation Notes
1. No Mixed Assembly: EN14399-3 HR system bolts, nuts and washers are specially matched sets. Mixing with ordinary standard fasteners is strictly prohibited, which will cause unstable preload and structural slip failure.
2. Standard Torque Installation: Professional torque wrench must be used for installation according to standard torque values. Over-tightening or under-tightening will affect structural stability and safety performance.
3. Hot-dip Galvanized Version Tips: Galvanized fasteners adopt professional surface treatment. Follow the standard galvanized torque parameters during installation to avoid thread galling and coating damage.
4. Strict Storage Protection: Store in dry and sealed environment to prevent thread damage and rust. Check product integrity before construction to ensure project qualification.
5. Disposable Engineering Fasteners: Preloaded structural bolt assemblies are not allowed to be reused after stress loading, ensuring long-term fatigue resistance and structural safety.
For EN14399 series structural bolt assemblies, customized steel structure fasteners and full-range supporting solutions, please contact us for accurate quotation and technical support.
