High-strength bolts are heavy-duty threaded fasteners manufactured from alloy steel through specialized heat treatment, featuring much higher tensile strength, yield strength, and clamping force than ordinary bolts.
Key Characteristics
High mechanical performance: Made from high‑strength alloy steel with quenching and tempering, providing excellent tensile and shear resistance.
Large pre‑tightening force: Installed with controlled torque to generate strong clamping force, effectively preventing relative slip between connected parts.
Good anti‑loosening performance: Stable under heavy loads, vibration, and impact, widely used in structural connections.
High dimensional accuracy: Strictly controlled dimensions to ensure reliable fitting and uniform stress distribution.
Common Grades
Common performance grades include 8.8, 10.9, 12.9, representing different levels of tensile strength and hardness.
Applications
High-strength bolts are mainly used in steel structure buildings, bridges, towers, rail transit, heavy machinery, automotive chassis, wind power equipment, and other fields requiring safe and rigid structural connections.