High Tensile Hex Head Bolts

Handan Hengmai Fasteners Manufacturing Co., Ltd. is one of the most reliable manufacturers and suppliers of high tensile hex head bolts in China. As we have world-leading production equipment and strong manufacturing capabilities, we warmly welcome you to buy bulk high quality high tensile hex head bolts for sale here from our factory. Customized orders are welcome.

High Tensile Hex Head Bolts are heavy-duty carbon steel fasteners produced in accordance with DIN931, DIN933, ISO4014 and ISO4017 standards. Through precise quenching and tempering heat treatment, the bolts achieve outstanding tensile strength and yield performance, suitable for applications under heavy load, alternating stress and long-term vibration. We manufacture matching high tensile hex nuts in‑house and supply complete bolt-nut sets for one-stop procurement, helping clients simplify multi-supplier sourcing. Our factory supplies Class 8.8, Class 10.9 and Class 12.9 specifications, supports multiple surface treatments, and provides reliable fastening solutions for steel structure, engineering machinery, energy equipment and infrastructure projects along Belt-and-Road regions.

1. Strict heat treatment process ensures uniform internal metal structure, strong resistance to tensile deformation and thread slippage under heavy load;

2. Precision rolled threads realize full engagement with matched nuts, evenly distributing stress and improving overall connection safety factor;

3. Excellent fatigue resistance, stable performance under long-term alternating load and vibration conditions;

4. Diversified surface treatment options meet indoor dry workshop and outdoor anti-corrosion engineering demands.

Widely applied in steel structure construction, bridge engineering, wind power equipment, mining machinery, petrochemical pipeline supports, truck chassis and large mechanical assembly. These high tensile bolts are essential for key structural joints requiring high load-bearing capacity and high safety standards.

Every batch undergoes Rockwell hardness test, torque-tensile performance test, thread go/no-go gauge inspection and dimensional calibration. Complete heat treatment records and raw material certificates are kept on file. SGS third-party mechanical test reports can be provided for engineering bidding and project acceptance. All production complies with ISO9001 quality management system.

Standard packing: inner moisture-proof PE bags + thickened outer woven bags, palletized for sea shipment. Large engineering orders support customized wooden case packaging. Store in dry and ventilated warehouses, stay away from humid and corrosive surroundings to avoid thread rust. We provide FOB, CIF, DDP multi-mode logistics solutions with stable delivery cycle.

Pre-sales technicians can recommend appropriate strength grade, length and surface treatment based on your load parameters and service environment. If factory-caused defective products are delivered, we support free replacement and bear corresponding logistics costs. We can offer professional construction torque reference suggestions.

Q1: What strength grade should I choose for steel structure projects?

A: Class 8.8 and Class 10.9 are widely used for general steel structures. Class 12.9 is recommended for equipment with extreme heavy load requirements.

Q2: Can you provide matched high tensile nuts together with bolts?

A: Yes. Our self-produced high tensile hex nuts can be shipped together with bolts in one consolidated order.

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