Large Diameter Lockbolts often called Huckbolts or Hucks are high‑strength structural fasteners designed for permanent joints in heavy‑duty applications. Combining a precision‑engineered pin and collar, lockbolts deliver exceptional shear and tensile strength with consistent clamp force and excellent vibration resistance. Once installed, the collar is swaged and mechanically locked, eliminating loosening under dynamic loads. Large diameter lockbolts are ideal for steel structures, transport equipment, mining, construction and heavy fabrication applications where reliability, strength and long‑term performance are critical.