Hydraulic self-centering vise is suitable for any metal cutting, drilling, tapping processing machinery, including CNC (HMC/VMC), etc. It has the characteristics of high precision, small size, light weight, large clamping range and flexible operation. Achieve positioning and clamping in one step. Regardless of the size of the workpiece, or whether its shape is round, square or irregular, the self-centering clamping system always ensures that the zero point position is the same. According to different workpieces, corresponding claws are customized to grip workpieces with complex contours. Workpieces with different contours can be processed by simply changing the jaws. The structure is simple and sturdy, the surface is flat and easy to clean. Can be used as a module on standard equipment.