TECHNICAL INFORMATION
High-Strength Structural
Bolting Assemblies
for Preloading
System HR hexagon bolt and nut assemblies, manufactured by Baaz Fasteners to full EN 14399 compliance.
High-Strength Structural
Intro
What Is EN 14399?
EN 14399 is the European standard governing high-strength structural bolting assemblies for preloading — the same HSFG bolts used in slip-critical structural connections. Part 3 of the standard (System HR) covers hexagon bolt and nut assemblies, defining dimensions, tolerances, material properties, and marking requirements. As a HSFG Bolts Manufacturer, Baaz Fasteners produces to full EN 14399-3 compliance, alongside IS 3757 and ASTM A325.
Dimensional reference for EN 14399-3 System HR bolts, Grade 8.8 and 10.9.
Material & Mechanical Properties
| Property | Requirement |
|---|---|
| General Requirements | EN 14399-1, EN 14399-2 |
| Thread Tolerance Class | 6g |
| Thread Standards | ISO 261, ISO 965-2 |
| Property Class | 8.8 or 10.9 |
| Mechanical Property Standard | EN ISO 898-1 |
| Product Grade | C (except dimensions c and r) |
| Finish — Uncoated | As processed |
| Finish — Hot Dip Galvanized | EN ISO 10684 |
| Finish — Other | To be agreed |
EN 14399 Assembly Manufacturers in India
Baaz Fasteners is a trusted name among EN 14399 assembly manufacturers in India, producing preloaded structural bolt sets engineered for high-strength steel connections. Each assembly follows the EN 14399-1 to EN 14399-10 series and is manufactured as a matched bolt, nut, and washer system so the three components perform together reliably once tightened to the specified preload — a requirement the standard treats as non-negotiable for slip-resistant structural joints.
Our EN 14399 assemblies are available in grades 8.8 and 10.9, across a diameter range of M12 to M36, and are built to both the HV and HR bolting systems. Bolts are manufactured to a minimum tensile strength of 1000 MPa with hardened washers rated at HRC 35–45 to maintain consistent clamping force under dynamic and vibrational loads. Coating options include hot-dip galvanizing (HDG) and zinc-flake finishes for added corrosion resistance in demanding outdoor and industrial environments.
As one of the reliable EN 14399 assembly manufacturers in India, Baaz Fasteners supplies these bolt sets for steel bridge construction, seismic-resistant buildings, high-rise structures, crane rail systems, wind turbine towers, and offshore engineering projects — applications where joint reliability and long-term structural integrity cannot be compromised.