Single acting hydraulic cylinder is a type of actuator that uses hydraulic pressure to generate force in only one direction, typically for extension. Retraction is achieved by an external force such as a spring, gravity, or load weight. This simple design includes a single port for fluid entry and is cost-effective, compact, and easy to maintain. Single acting cylinders are widely used in applications where force is needed in only one direction, such as in lifting devices, hydraulic jacks, clamps, and some agricultural or construction equipment. Their efficiency and simplicity make them ideal for systems with limited space and straightforward operational needs.