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Self-locking cylinders are very uncommon kind ofcylinders, are the most difficult, highest technology required,and particularly used cylinders . Because of its wonderful function ,it Got excellent reputation in the plastic injection field even with high price. Self-locked by is the key point for a Self-locking cylinder.As the inner mechanicalcomponents,the cylinder is lockedby hydraulic automatic, then, no another oil portinto the oil is unable open the mechanical lock. When the mechanical lock is closed, it can holdpressure at1-1.5 tonne. Self-locking cylinders aresuitable formany perforated structure mold, such as automotive bumper mold, dustbin mold, etc., We highly appreciate your visiting.