This series of hydraulic stretcher is specially used for calibrating and press-fitting of the parts of axial and axie sleeve varieties, and for shaping, punchine and embossing of relative components, the machine bldy is selded by steel plates with the characteristics of high sensitive of direction-changing,non-contact or non-vacant stroke, and of accuracy being calibrated to 3dmm,It is specially suitable for the caliabration of rollers of textile, axles and link levels of automobiles and motorcycles,. Hsteel,channels,roundbars,angle steels etc,Both of its pressure and stroke can be regulated,controlled with easy operating.