HU type HI-LOCK UNITS are hydraulic units to which an SR pump (pneumatic-driven hydraulic pump) and air pilot type hydraulic selector valve (non-leak type) are built in. Selector valves, pressure switches, optional circuits, and stand-by circuits can be mounted with the manifold. HI-LOCK UNITS are designed to be flexible and compact for various applications. 

The SR pump can be selected freely according to the discharge rate (HU63 Series for standard type and HU100 Series for greater discharge rate). In addition, pressure gauges and air filters are standardly equipped. Where there is an air source, there are always HU70 HI-LOCK UNITS with high oil pressure. They can be used not only in clamping systems but also in other lock systems.