A Large Diameter Lock Bolt Installation Tool is a hydraulic or air-hydraulic powered fastening system engineered to install high-strength, large-diameter lock bolts (commonly 7/16″, 1/2″, 5/8″, 3/4″, or larger). Lock bolts are two-piece, vibration-resistant fasteners consisting of a pin and a collar. They are widely used as a permanent mechanical alternative to nuts and bolts or welding in structural, transportation, and heavy equipment applications. The installation tool provides the pulling and swaging force necessary to deform (swage) the collar into the locking grooves of the pin — creating a tamper-proof, high-strength joint capable of withstanding extreme vibration, shear, and tensile loads.