Hot Dip Galvanized Structural Bolts for Construction are high-strength fasteners engineered specifically for critical load-bearing scenarios in construction projects. These bolts undergo a hot-dip galvanization process—a technique where they are fully immersed in molten zinc—to form a thick, metallurgic-ally bonded zinc coating.
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Product Description
This coating provides superior corrosion resistance in environments with high humidity, salt exposure, or temperature fluctuations. Manufactured to align with international standards such as GB/T 13912-2020 and ASTM A325, they ensure consistent performance in structural steel connections, bridge frameworks, and industrial facility installations.
Corrosion Resistance: The galvanized coating withstands 2,000+ hours of salt spray testing (67% above GB/T 13912-2020 requirements), making them suitable for coastal regions, industrial zones with chemical emissions, and high-moisture areas like water treatment plants.
High Tensile Strength: The tensile strength of Grade 10.9 bolts is measured at 1080-1150MPa, exceeding national standards by 10%, with a yield strength of 940-1020MPa. Even at -40°C, the impact toughness retention rate remains ≥95%, ensuring reliability in cold climates.
Superior Durability: The triple-layer zinc coating (pure zinc layer + zinc-iron alloy layer + diffusion layer) achieves the highest adhesion level 0 (GB/T9793-2015), far exceeding the industry average. This structure resists chipping during installation and maintains integrity under mechanical stress.
Precision Manufacturing: An intelligent temperature control system (zinc pot temperature accuracy ±2°C ) ensures a uniform and dense zinc layer, with bolt dimensional accuracy complying with ASTM A325 standards. Threads are rolled rather than cut to enhance fatigue resistance.
Building Structures: Essential for steel frame connections in high-rise buildings, stadiums, and industrial warehouses, where long-term stability and corrosion resistance are critical.
Infrastructure Projects: Used in bridge girders, highway overpasses, and railway tracks, providing secure fastening in dynamic load environments.
Energy Facilities: Applied in power transmission towers, wind turbine bases, and solar panel mounting systems, withstanding outdoor exposure for decades.
Q: Are these bolts compatible with pre-painted steel structures?
A: Yes, their smooth galvanized surface minimizes paint damage during installation, but care should be taken to avoid scratching the coating.
Q: What is the recommended storage condition?
A: Store in a dry, well-ventilated area away from direct sunlight and moisture. Use sealed packaging to prevent white rust formation.
Q: Can they be reused after removal?
A: Reuse is not recommended for critical load applications, as tension characteristics may degrade after initial installation.
