Infrastructure Engineering

• Material: Manufactured from Grade 10.9 / 12.9 high-strength alloy structural steel and high-strength carbon steel, with Grade 14.9 ultra-high-strength material used for key load-bearing parts. Bolts undergo quenched and tempered heat treatment and reinforcement processing, with tensile strength ≥ 1040MPa, yield strength ≥ 940MPa, and ultra-high-strength versions reaching over 1400MPa. Featuring excellent pull-out and shear resistance, the products withstand heavy loads, long-span forces, and long-term static loads in infrastructure, eliminating risks of bolt fracture, deformation, and loosening to meet high-reliability fastening demands.
• Core Advantages: Large-size, high-load, fatigue-resistant and impact-resistant, ideal for core load-bearing applications such as bridge bearing connections, high-rise steel structure splicing, and tunnel anchoring. They sustain heavy loads, vibration, and environmental stress over the long term, complying with strict infrastructure load-bearing standards, resisting loosening and breakage, improving structural stability, and reducing later maintenance costs.
• Common Specifications: Large-diameter hex bolts, high-strength anchor bolts, large-size steel structure bolts, and anchor bolts (M24–M100 and above). Custom sizes, thread pitches, lengths, and head styles are available per engineering drawings and standards (GB, ISO, GB/T 1499.2, etc.), adapting to various load scenarios while balancing installation convenience and load stability.

• Material Selection: Matched with large-size high-load bolts using Grade 8 / 10 / 12 high-strength alloy steel, with strength precisely coordinated with bolts. Enhanced heat treatment delivers superior compression and shear resistance, preventing thread stripping, cracking, and seizing caused by uneven stress or heavy-load extrusion. Nuts perform reliably under heavy-duty outdoor conditions, forming a high-load fastening system with bolts.
• Core Advantages: Large-size compatible and high-load certified, with integrated multi-level locking structures to resist stress from vibration and structural settlement. They also offer outdoor weather resistance (rust and corrosion prevention), avoiding loosening and seizing during service, simplifying maintenance disassembly, and supporting long-term infrastructure use.
• Common Specifications: Large-diameter hex lock nuts, flange high-load nuts, anchor bolt matching nuts, and steel structure special nuts (M24–M100 and above). They accurately fit various large-size infrastructure bolts, adapting to assembly spaces and load requirements in bridges, tunnels, high-rise buildings, and other scenarios.

To meet high-load and long-span demands, dedicated auxiliary fasteners are provided to work with main bolts and nuts, further enhancing load stability and structural safety:

• High-strength flat/elastic washers: Made of high-strength alloy steel with increased thickness and bearing area to distribute stress, prevent substrate damage, and improve fastening stability for large-size bolts.
• Anchor series: Chemical and mechanical anchors (large-size) for tunnel, wall, and foundation anchoring, delivering strong pull-out resistance and stable fixation for deep, high-load applications.
• Locking components: High-strength lock washers and locking pins to enhance anti-loosening performance under vibration and settlement, ensuring long-term stability under heavy loads.

Products pass specialized load tests (pull-out, shear, tensile) to withstand heavy loads, long-span forces, and long-term static loads. The bolt-nut system eliminates loosening and breakage, providing reliable support for bridges, high-rises, and other critical structures while reducing safety risks.

Primarily M24 and above large-size series, with customizable larger dimensions to meet bridge, tunnel, and steel structure needs. Balancing universality and customization, they solve the pain points of undersized and underloaded conventional fasteners.

Full-process quality control covers raw material inspection, dimensional accuracy, mechanical performance, and high-load testing. Third-party reports from SGS, BV are available. Products conform to ISO/TS 16949 and infrastructure standards including GB/T 1499.2, with full quality traceability for high-end projects.

Bolts and nuts use hot-dip galvanizing, Dacromet, and other anti-corrosion finishes, resisting weathering, corrosion, and aging. They perform reliably outdoors under long-term exposure, humidity, and temperature fluctuations, extending service life and lowering maintenance costs.

Designed for on-site infrastructure construction, with precise large-size threads and user-friendly locking structures. Suitable for high-altitude and underground environments, they enable fast installation with professional tools, reducing construction time and supporting tight project schedules.