A hydraulic cylinder china hydraulic cylinder is a mechanical actuator used to supply unidirectional force through a unidirectional stroke. Hydraulic cylinders are used in almost every market and so are available in a variety of configurations. The two primary types of hydraulic cylinders are Tie-rod and Welded. Each one of these cylinder types can have unique applications because of their designs. Tie-rod cylinders are usually set up in light to moderate duty applications and tend to be designed to become repaired or re-loaded if necessary. Welded cylinders are made for most applications and are more technical in design but are usually more difficult to repair because of the welded design. Welded cylinders are usually a better solution because of their compact design so when a more robust style is important within an application.