A hydraulic cylinder china Hydraulic cylinder is a mechanical actuator used to provide unidirectional force through a unidirectional stroke. Hydraulic cylinders are found in almost every industry and are available in a number of configurations. The two main types of hydraulic cylinders are Tie-rod and Welded. Each of these cylinder types can possess unique applications due to their styles. Tie-rod cylinders are often installed in light to medium duty applications and tend to be designed to be repaired or re-loaded if necessary. Welded cylinders are created for most applications and so are more complex in style but are generally more difficult to repair due to the welded design. Welded cylinders are typically a better solution due to their compact design and when a more robust design is important in an application.