Steel Structure Building High-Strength Hex Bolts

Reliable connection is the foundation of safe construction. Steel Structure Building High-Strength Hex Bolts are core fasteners tailored for high-rise buildings, industrial workshops and large infrastructure projects. Manufactured by Ningbo Gangtong Zheli Fasteners Co., Ltd., the bolts boast outstanding tensile strength and excellent anti-fatigue performance, keeping stable under long-term heavy load and dynamic vibration.

The picture shows the complete bolt assembly with matched nuts and washers. The finely processed threads and even surface finish guarantee tight fitting and consistent using performance.

Product Features & Technical Parameters

Adopting premium alloy steel as raw material, all products go through professional heat treatment. Grade 8.8 bolts reach a minimum tensile strength of 830 MPa, while Grade 10.9 bolts hit 1040 MPa, fully complying with ISO 898-1 and ASTM A325 international standards. We provide multiple surface treatments including black oxide and hot-dip galvanizing, which deliver great anti-corrosion ability for both indoor and outdoor construction environments. The precisely rolled threads effectively prevent loosening caused by vibration.

This image records key working procedures such as heat treatment and finished product inspection, following strict production specifications all the way.

Application & Quality Control

Our products are widely applied to steel frames, bridge connections and heavy mechanical assembly. Every batch of Steel Structure Building High-Strength Hex Bolts will undergo strict tests on hardness, torque and salt spray. At Ningbo Gangtong Zheli Fasteners Co., Ltd., we have established a full product traceability system. Complete inspection documents and thoughtful after-sales service are available to fully protect your engineering projects.

The real-scene photo displays the practical application of the bolts. They firmly connect steel beams to form solid and durable structural joints.