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En14399-3 Hr Hot DIP Galvanizing 10.9 Bolt
EN 14399-3 HR Hot Dip Galvanizing 10.9 Bolt – A high-strength structural bolt designed for preloaded connections in steel structures, manufactured to EN 14399‑3 as part of the HR system (bolt, nut, and washer supplied as a matched assembly). Hot dip galvanized to provide corrosion resistance while maintaining the required tightening characteristics. Property class 10.9 ensures high preloading force, typically achieving at least 0.7 × tensile strength × stress area, with ductility achieved through plastic elongation of the bolt. The HR system relies on controlled tightening (e.g., torque or rotation) and is commonly used in bridges, buildings, and tower structures where slip‑resistant joints are required.
EN 14399-3 HR Hot Dip Galvanizing 10.9 Bolt – A high-strength structural bolt designed for preloaded connections in steel structures, manufactured to EN 14399‑3 as part of the HR system (bolt, nut, and washer supplied as a matched assembly). Hot dip galvanized to provide corrosion resistance while maintaining the required tightening characteristics. Property class 10.9 ensures high preloading force, typically achieving at least 0.7 × tensile strength × stress area, with ductility achieved through plastic elongation of the bolt. The HR system relies on controlled tightening (e.g., torque or rotation) and is commonly used in bridges, buildings, and tower structures where slip‑resistant joints are required.
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Product Details
Product Introduction
CE-marked high-strength structural bolting assemblies manufactured to EN 14399-3 for System HR (Hexagon head with Reinforcement). Designed for preloaded joints in steel structures to Eurocode 3 (EN 1993-1-8), each assembly includes a property class 10.9 hexagon bolt with large widths across flats, a property class 10 hexagon nut, and through-hardened washers to EN 14399-6. Sizes M12 to M36. HR assemblies achieve preload by bolt elongation, offering controlled ductility and insensitivity to moderate overtightening.
Thread Tolerance & Hot-Dip Galvanizing
Bolts are threaded before hot-dip galvanizing to tolerance class 6az per ISO 965-5, providing an oversize allowance that accommodates the zinc coating thickness (typically 40–80 μm). After galvanizing, the external thread mates correctly with internal thread tolerance 6H. Nuts to property class 10 feature 6H (or 6AZ if galvanized) internal threads with a proof load stress of 1160 MPa.
Mechanical Properties & Thread Length
Bolts conform to EN ISO 898-1 property class 10.9: minimum tensile strength 1000 MPa, yield strength 900 MPa. Nuts are property class 10 to EN ISO 898-2, style 1 normal height per EN ISO 4032. Thread length follows ISO 888—longer than standard—so preload reaches at least 0.7 × fub × As (70% of ultimate tensile load). This geometry ensures ductility through plastic elongation of the bolt shank; bolt breakage during tensioning is the designated failure mode, providing a clear indication of over-tension.
Washers & Assembly Compliance
Washers are supplied under the nut only, conforming to EN 14399-6: Vickers hardness 300–370 HV, through-hardened to distribute preload and prevent embedment. The complete hot-dip galvanized assembly complies with EN ISO 10684 for coating durability and EN 1090-2 for preloaded joint installation. Every component carries traceability codes and is backed by batch-specific inspection certificate 3.1 per EN 10204.
| Place of Origin | CHINA |
| Standard | En14399-3 Hr Hot DIP Galvanizing 10.9 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 |
Product Introduction
CE-marked high-strength structural bolting assemblies manufactured to EN 14399-3 for System HR (Hexagon head with Reinforcement). Designed for preloaded joints in steel structures to Eurocode 3 (EN 1993-1-8), each assembly includes a property class 10.9 hexagon bolt with large widths across flats, a property class 10 hexagon nut, and through-hardened washers to EN 14399-6. Sizes M12 to M36. HR assemblies achieve preload by bolt elongation, offering controlled ductility and insensitivity to moderate overtightening.
Thread Tolerance & Hot-Dip Galvanizing
Bolts are threaded before hot-dip galvanizing to tolerance class 6az per ISO 965-5, providing an oversize allowance that accommodates the zinc coating thickness (typically 40–80 μm). After galvanizing, the external thread mates correctly with internal thread tolerance 6H. Nuts to property class 10 feature 6H (or 6AZ if galvanized) internal threads with a proof load stress of 1160 MPa.
Mechanical Properties & Thread Length
Bolts conform to EN ISO 898-1 property class 10.9: minimum tensile strength 1000 MPa, yield strength 900 MPa. Nuts are property class 10 to EN ISO 898-2, style 1 normal height per EN ISO 4032. Thread length follows ISO 888—longer than standard—so preload reaches at least 0.7 × fub × As (70% of ultimate tensile load). This geometry ensures ductility through plastic elongation of the bolt shank; bolt breakage during tensioning is the designated failure mode, providing a clear indication of over-tension.
Washers & Assembly Compliance
Washers are supplied under the nut only, conforming to EN 14399-6: Vickers hardness 300–370 HV, through-hardened to distribute preload and prevent embedment. The complete hot-dip galvanized assembly complies with EN ISO 10684 for coating durability and EN 1090-2 for preloaded joint installation. Every component carries traceability codes and is backed by batch-specific inspection certificate 3.1 per EN 10204.
| Place of Origin | CHINA |
| Standard | En14399-3 Hr Hot DIP Galvanizing 10.9 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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