Tie-rod hydraulic cylinders have four rods (bolts) that connect the ends of a double-acting hydraulic cylinder to add strength and stability to the cylinder and prevent it from coming apart under pressure. Double-acting tie-rod hydraulic cylinders provide power in both directions (extending and retracting), which allows for more precise movement. They have a linear actuator and are used in agricultural equipment, industrial machinery, and construction equipment to support, lift, and press heavy loads.