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Tructural Bolt Assembiles
EN14399 HV Hexagon Head Structural Bolt
EN 14399-4 HV Hexagon Head Structural Bolt – HV system hexagon bolt and nut assembly per EN 14399-4. Property class 10.9/10. Thread sizes M12–M36. Preload ≥0.7 fub × As per Eurocode 3. Ductility via plastic deformation of engaged threads within nut. Nut height ≈0.8d; bolt with short thread length. Supplied with washers per EN 14399-6 (under nut only). CE marked per CPR 305/2011. Applications: preloaded slip-resistant joints in steel bridges, buildings, towers, and heavy structures subject to vibration or load reversal.
EN 14399-4 HV Hexagon Head Structural Bolt – HV system hexagon bolt and nut assembly per EN 14399-4. Property class 10.9/10. Thread sizes M12–M36. Preload ≥0.7 fub × As per Eurocode 3. Ductility via plastic deformation of engaged threads within nut. Nut height ≈0.8d; bolt with short thread length. Supplied with washers per EN 14399-6 (under nut only). CE marked per CPR 305/2011. Applications: preloaded slip-resistant joints in steel bridges, buildings, towers, and heavy structures subject to vibration or load reversal.
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Product Details
EN 14399-4 High-Strength Structural Bolting Assemblies – System HV, Property Class 10.9/10, Hexagon Head Bolt
This product is a high-strength structural bolting assembly manufactured and CE-marked to EN 14399-4 for System HV (Hochfest Vorgespannt – high-strength preloaded), specifically designed for preloaded joints in steel structures. The assembly comprises a property class 10.9 hexagon head bolt, a property class 10 hexagon nut, and two washers to EN 14399-6. Available in metric thread sizes M12 to M36 with large widths across flats. The bolt features a partial thread design and is engineered to achieve preloading of at least 0.7 × fub × As (70% of ultimate tensile load) per EN 1993-1-8 (Eurocode 3), with ductility obtained predominantly by plastic deformation of the engaged threads.
What are the specific mechanical property requirements for EN 14399-4 System HV property class 10.9 bolts?
The property class 10.9 bolt conforms to EN ISO 898-1, requiring a minimum tensile strength of 1040 MPa and a minimum yield strength of 940 MPa. The mating nut is property class 10 to EN ISO 898-2, with proof load stress verified to EN 20898-2. Washers to EN 14399-6 are through-hardened with Vickers hardness 300–370 HV. The System HV is designed with a reduced nut height of approximately 0.8d and a short thread length on the bolt to achieve ductility predominantly by plastic deformation of the engaged threads rather than bolt elongation.
What are the dimensional range, partial thread configuration, and hot-dip galvanized coating specifications for HV bolts?
Thread sizes range from M12 to M36, with lengths available from 30 mm to 240 mm. The bolt features a partial thread (half-thread) design, with thread length (b) specified per EN 14399-4 dimensional tables; for example, an M20×105 bolt has a thread length of 33 mm. Width across flats (sw) is enlarged characteristic of System HV, with M24 featuring 41 mm across flats. For hot-dip galvanized versions, the coating to EN ISO 10684 provides a sacrificial zinc layer with a minimum thickness of 50 microns. Threads are manufactured with oversize tolerance before galvanizing to maintain proper fit after coating, and nuts are typically supplied with molybdenum disulphide (MoS₂) lubricant resulting in a characteristic black appearance. Friction coefficient classification is defined as K‑class K1, enabling precise control of preload.
What are the mandatory system requirements, CE marking, traceability, and certification for HV bolt assemblies?
The complete System HV assembly comprises one bolt (EN 14399-4, grade 10.9), one nut (EN 14399-4, grade 10), and two washers (EN 14399-6, grade HV300). To ensure valid CE marking under the Construction Products Regulation (CPR, System 2+), all three components must be supplied by the same manufacturer as a matched assembly. The bolt head must be permanently marked with 'HV' (identifying System HV), the property class 10.9, the manufacturer's identification mark, and a unique lot traceability code. Each assembly is accompanied by a Declaration of Performance (DoP) and bears the CE mark. Batch lot marking on the bolt head provides full traceability, and the assembly can be supplied with EN 10204 Type 3.1 inspection certificates upon request.
| Place of Origin | CHINA |
| Standard | EN14399 HV Hexagon Head Structural Bolt |
| HS CODE | 7318159001 |
| Brand Name | QBH |
| Certification | ISO9001 |
| Material | 35K, 40Cr, 35CrMo, SCM435，etc. |
| Size | M3-M64 |
| Production Process | Cold forging≤300mm, Hot forging≤1000mm |
| Class | 4.8/ 6.8/ 8.8/ 10.9/ 12.9 |
| Delivery Time | Within 30 Days |
EN 14399-4 High-Strength Structural Bolting Assemblies – System HV, Property Class 10.9/10, Hexagon Head Bolt
This product is a high-strength structural bolting assembly manufactured and CE-marked to EN 14399-4 for System HV (Hochfest Vorgespannt – high-strength preloaded), specifically designed for preloaded joints in steel structures. The assembly comprises a property class 10.9 hexagon head bolt, a property class 10 hexagon nut, and two washers to EN 14399-6. Available in metric thread sizes M12 to M36 with large widths across flats. The bolt features a partial thread design and is engineered to achieve preloading of at least 0.7 × fub × As (70% of ultimate tensile load) per EN 1993-1-8 (Eurocode 3), with ductility obtained predominantly by plastic deformation of the engaged threads.
What are the specific mechanical property requirements for EN 14399-4 System HV property class 10.9 bolts?
The property class 10.9 bolt conforms to EN ISO 898-1, requiring a minimum tensile strength of 1040 MPa and a minimum yield strength of 940 MPa. The mating nut is property class 10 to EN ISO 898-2, with proof load stress verified to EN 20898-2. Washers to EN 14399-6 are through-hardened with Vickers hardness 300–370 HV. The System HV is designed with a reduced nut height of approximately 0.8d and a short thread length on the bolt to achieve ductility predominantly by plastic deformation of the engaged threads rather than bolt elongation.
What are the dimensional range, partial thread configuration, and hot-dip galvanized coating specifications for HV bolts?
Thread sizes range from M12 to M36, with lengths available from 30 mm to 240 mm. The bolt features a partial thread (half-thread) design, with thread length (b) specified per EN 14399-4 dimensional tables; for example, an M20×105 bolt has a thread length of 33 mm. Width across flats (sw) is enlarged characteristic of System HV, with M24 featuring 41 mm across flats. For hot-dip galvanized versions, the coating to EN ISO 10684 provides a sacrificial zinc layer with a minimum thickness of 50 microns. Threads are manufactured with oversize tolerance before galvanizing to maintain proper fit after coating, and nuts are typically supplied with molybdenum disulphide (MoS₂) lubricant resulting in a characteristic black appearance. Friction coefficient classification is defined as K‑class K1, enabling precise control of preload.
What are the mandatory system requirements, CE marking, traceability, and certification for HV bolt assemblies?
The complete System HV assembly comprises one bolt (EN 14399-4, grade 10.9), one nut (EN 14399-4, grade 10), and two washers (EN 14399-6, grade HV300). To ensure valid CE marking under the Construction Products Regulation (CPR, System 2+), all three components must be supplied by the same manufacturer as a matched assembly. The bolt head must be permanently marked with 'HV' (identifying System HV), the property class 10.9, the manufacturer's identification mark, and a unique lot traceability code. Each assembly is accompanied by a Declaration of Performance (DoP) and bears the CE mark. Batch lot marking on the bolt head provides full traceability, and the assembly can be supplied with EN 10204 Type 3.1 inspection certificates upon request.
| Place of Origin | CHINA |
| Standard | EN14399 HV Hexagon Head Structural Bolt |
| HS CODE | 7318159001 |
| Brand Name | QBH |
| Certification | ISO9001 |
| Material | 35K, 40Cr, 35CrMo, SCM435，etc. |
| Size | M3-M64 |
| Production Process | Cold forging≤300mm, Hot forging≤1000mm |
| Class | 4.8/ 6.8/ 8.8/ 10.9/ 12.9 |
| Delivery Time | Within 30 Days |
FAQ
1. How do you let me trust you.
Jiaxing City Qunbang Hardware Co.,ltd hs its own right of import and export,QBH trademark in China,United States,European Union have been registered.At the same time,you can also check the registration information of our company in the China industry and Commerce system.
2. How about your price.
We will be based on different markets,for different quality and quantity,tailor-made prices for customers,in order to achieve win-win goal.
3. How do you control your quality.
Incoming quality contral( IQC)→Process Quality control(PQC)→Output quality control(OQC),and the random samples is sent to TUV for testing.If the customer received the goods and found quality problems,QBH company promises to be responsible for returning money or replenishing the goods
4. Could you provide free samples?
For new customer, We can provide free samples for standard fastener, But the clients will pay the express
charges. For old customer, We will send you free samples and pay express charges by ourself.
5. What is your packing.
Usually 25KG/carbon,36CTNS on the pallets,or 20-30kg/Bags,then on the pallet,QBH company personalized packagingis also available,like 10PCS/plastic bag or 10pcs/box,it can print some information
such as LOGO and pattern of customers.
6. What is your payment term
Normally,our terms of payment are TT and L/C,if we cooperate for a long time,we can reach the point of mutual trust,and fully support our customers to become bigger and stronger in the local market.Not only in the price concessions,but also in the payment can also be made on credit,Specific credit sales time needs to be negotiated separately.
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