High precision grip with runout accuracy of “1μm” Superior accuracy allows for a wide range of applications spanning from forming processes to inspection. CONCENTRIC Rotary Hydraulic tools are tools to hold workpieces (products, tools, etc.) by taking advantage of the metallic deformation (elastic deformation) in thin cylindrical portions as a result of static hydraulic pressure. There are two types of hydraulic tools: • “Hydraulic mandrel”, where the outside diameter expands to hold workpieces in the shape of a hole • “Hydraulic chuck”, where the inside diameter contracts to hold workpieces in the shape of an axis