What is the HV Hexagon Bolt ?
An HV bolt refers to a high-strength preloaded hexagonal head bolt assembly. Its name is derived from the German term Hochfest Vorgespannt, where “Hochfest” means high-strength and “Vorgespannt” denotes preloaded. High-strength bolts typically refer to pre-tensioned bolt assemblies, including structural bolts, nuts, and washers that conform to EN 14399-4 standards, and are widely used in prestressed steel structures.
WHAT THE HV SET CONSISTS OF?
The HV bolt assembly includes the following bolts, nuts, and washers:
- 1 x HV 10.9 grade hexagonal head bolt, hot-dip galvanized, conforming to EN 14399-4 standard
- 1 x HV 10 grade hexagonal nut, hot-dip galvanized, conforming to EN 14399-4 standard
- 2 or 3 x HV 300-370 HV washers, hot-dip galvanized, conforming to EN 14399-6 standard
According to EN 14399-6 standard, high-strength bolt assemblies also include washers. All system components (bolts, nuts, and washers) must be sourced from the same manufacturer.
In which fields are HV bolt assemblies primarily used?
The EN 14399 standard was developed for high-strength preloaded fasteners, and therefore HV type bolt, nut, and washer assemblies are widely used in construction projects requiring pre-tensioned bolt assemblies. With our 15 years of experience in manufacturing and exporting HV bolt assemblies, our products are primarily used in construction projects such as steel structures, commercial or industrial buildings, bridges, wind turbines, and railway and road construction.
Gmetalparts manufactures and exports Grade 10.9 HV bolts conforming to EN 10684 standard, utilizing a hot-dip galvanizing process with a minimum coating thickness of 50 microns. These bolts offer excellent corrosion resistance, providing long-lasting protection even in the harsh environments of most construction projects.”
WHAT IS THE DIFFERENCE BETWEEN HR AND HV?
HR and HV are both preloaded high-strength bolt assemblies compliant with the EN 14399 standard for steel structure connections. HV :Derived from the German term hochfest vorgespannt, it represents the German-style preloaded bolt system. Its related standards correspond to EN 14399 – 4, and its previous corresponding DIN standard is DIN 6914.
HR:The abbreviation of high resistance, it represents the British – French style high – strength preloaded bolt system. It complies with EN 14399 – 3, and there is no corresponding old DIN standard like HV.
Differences Between HV Bolts and Regular Hexagon Bolts
| Feature | HV Bolts (HV Bolt Assemblies) | Regular Hexagon Bolts | ||||||
| Core Positioning & Design Purpose | A specialized high-strength preloaded structural bolt assembly (compliant with BS EN 14399-4), designed exclusively for critical load-bearing steel structure connections that demand high rigidity, fatigue resistance, and preload stability. | A general-purpose fastener (compliant with ISO 4014, etc.), used for ordinary low-to-medium load clamping (e.g., equipment brackets, scaffolding) where strict preload control is unnecessary. | ||||||
| Supply Form & Component Matching | Supplied as a factory-matched, non-separable kit (1×10.9-grade bolt + 1×HV10 thin nut + 2×chamfered washers). All components are performance-verified as a unit, and mixing with other bolt systems (e.g., HR) is strictly prohibited. | Sold individually; nuts and washers are selected separately and can be freely matched across brands, with no mandatory compatibility requirements. | ||||||
| Strength Grade & Structural Design | Fixed 10.9 strength grade (tensile strength ≥1000 N/mm²), paired with thin nuts (0.8D height) and short-thread bolts to save installation space, ideal for tight gaps. | Multiple grades available (4.6/8.8/10.9/A2-70), with standard-height nuts (≥0.9D) and long/full-thread designs, featuring a conventional, bulky structure. | ||||||
| Function Principle & Installation Requirements | Rely on controlled preload to clamp steel plates tightly; loads are transferred via friction between plates (not bolt shear). Installation requires a calibrated torque wrench to ensure accurate preload. | Transfer loads directly via bolt shear or tension; no strict preload control is needed, and installation can be done with an ordinary wrench. | ||||||
| Application Scenarios | Space-constrained heavy-load critical connections (wind turbine tower sections, bridge steel box girders, port crane frames). | General non-critical connections (furniture assembly, construction scaffolding, equipment mounting brackets). | ||||||
HV bolts are specialized high-performance assemblies for critical steel structure preloading, emphasizing compact design, stable preload, and safety. Regular hexagon bolts are general-purpose fasteners for daily clamping needs, with flexible selection and lower cost, but they cannot meet the strict requirements of heavy-load structural connections.
Hangzhou Gmetalparts Co., Ltd. manufactures and supplies HV bolts and HR bolts according to EN 14399-3 and EN 14399-4 standards, as well as SB bolts conforming to EN 15048 standards, with strength grades of 8.8 and 10.9, and offers hot-dip galvanized coatings, suitable for structural construction and industrial applications. If you are looking for HV bolts, HR bolts, or SB bolt assemblies conforming to EN15048 standards, please feel free to contact us via email at jenny@gmetalparts.com. We look forward to providing the best support for your project.
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Yes. Hangzhou Gmetalparts produce 304 and 316 stainless steel hex bolts that comply with AS 1110.1 – 2000. These bolts are optimized for corrosion resistance. The 316 grade ones are suitable for coastal or chemical – exposed environments in Australia and New Zealand, and their dimensional and thread standards are fully consistent with carbon steel AS/NZS hex bolts.
Hangzhou Gmetalparts has been dedicated to the R&D, manufacturing and trading of Australia-standard structural steel bolts since 2008. As a professional fasteners manufacturer in china , we strictly adhere to core Australian standards including AS/NZS 1252 and AS 1110.1, offering a full range of structural bolt products with strength grades of 8.8 and 10.9, together with matching nuts and washers . Our products fully meet the critical connection requirements of steel structure projects in Australia and New Zealand.
Equipped with advanced stamping and CNC machining equipment, coupled with a comprehensive quality inspection system, we maintain rigorous control over material stability, dimensional accuracy and mechanical properties of our bolts products. These bolts are ideal for heavy-load scenarios such as factory steel trusses and building beam-column joints, while also satisfying the auxiliary connection needs of general steel structures. Thanks to their reliable quality, our products have been exported to overseas markets on a large scale, establishing us as a trusted supplier in the Australia-standard structural steel bolt sector.To ensure the safety and longevity of of your structures, please feel free to ask us for high strength bolting solutions via sales@gmetalparts.com . Our fasteners experts are always here to support you at our best. Look forward to hear from you.
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