High Preload Capacity
Designed for friction-type structural joints, EN 14399 bolts provide stable clamping force to prevent joint slipping under heavy loads.
EN 14399 High-strength structural bolting assemblies for preloading-system HR-Hex bolt
- Standard: EN 14399
- Material: Stainless Steel
- Thread Size: M12-M36
- Surface Treatment: Plain, Zinc Plated
- Min Order: 5000pcs
- Sample: Free sample (after quote)
- Delivery time: 30 – 45 Days
Product Overview
Product Application
EN 14399 bolts are the most important high-strength, preloaded hexagonal bolts (HSFG) used in steel structure connections. Their key features include a larger hexagon head width across flats (WAF)—often referred to as “large hexagon”—and a wider bearing surface; these are designed to generate substantial axial preload through high torque, enabling the transfer of external loads via friction between the contact surfaces of the connected components. They are widely used in bridges, high-rise buildings, and heavy-load steel structure projects. In European and international engineering, System HV bolts (EN 14399-4) and System HR bolts (EN 14399-3) are the most commonly used types.
Draw
Specification
EN 14399 Bolt Types
EN 14399-3 HR System
High Strength Hexagon Bolt Assembly
- Bolt and nut assembly with controlled preload performance
- Provides excellent ductility through bolt elongation
- Suitable for heavy structural connections
EN 14399-4 HV System
High Strength Structural Hexagon Bolt Assembly
- Most commonly used EN 14399 bolt type
- Grade 10.9/10
- Large head design for steel structures
- Comparable to DIN 6914 structural bolts
EN 14399-10 HRC System
Tension Control Bolt Assembly
- Calibrated preload system
- Enables controlled tightening during installation
- Suitable for projects requiring precise bolt tension control
EN 14399 Bolt vs DIN 6914 Bolt
EN 14399 Bolt
- European standard for complete preloaded structural bolting assemblies
- Includes performance requirements for bolt, nut, washer combinations
DIN 6914 Bolt
- German standard mainly defining high-strength structural hexagon bolts
- Commonly replaced by EN 14399-4 in European projects
Product Advantages
Complete Matched Assembly
Bolt, nut, and washer are supplied as a tested set to ensure reliable installation performance.
Heavy-Duty Structural Reliability
Manufactured for demanding applications including bridges, steel frames, wind power towers, and industrial structures.
Common Questions
What is an EN 14399 bolt?
EN 14399 bolt is a high-strength structural bolt assembly designed for preloaded steel structures. It consists of a bolt, nut, and washer set that is tested and matched to provide reliable clamping force for critical steel connections.
What is the difference between EN 14399 and standard structural bolts?
EN 14399 bolts are specifically designed for preloaded structural joints where controlled tightening force is required. Unlike standard bolts, EN 14399 assemblies must meet strict requirements for preload performance, tightening behavior, and component compatibility.
Can EN 14399 bolts be hot dip galvanized?
Yes. EN 14399 bolts can be supplied with suitable corrosion protection finishes, including hot dip galvanizing and zinc flake coatings, depending on project requirements and installation conditions.
Can EN 14399 bolts be customized?
Yes. Manufacturers can provide customization options, including: Bolt length; Thread length; Surface coating; Packaging; Marking requirements; OEM production
