Double-acting hydraulic cylinders are hydraulic actuators that generate thrust in both extension and retraction directions by supplying hydraulic fluid to both sides of the piston. Unlike single-acting types, they use hydraulic pressure rather than springs for the return stroke, enabling high-precision positioning and stable operation. Widely used in press machine ram drives, injection molding machine clamping and injection, machine tool workpiece fixing, and conveying/lifting devices in automation lines. Available in extensive specifications: bore diameter 32-320mm, stroke 50-3000mm, operating pressure 7-35MPa, with cushioning mechanism and magnetic switch compatible options.