Hydraulic bolt tensioner puts the tensile force from manual or electric high  pressure cylinder on bolts to elongate within elastic bent region, its diameter  changes micro-scale, so nut can be move bottom easily, tighten works  finished after release the tensioner. Conversely, can remove nut easily and  no damage thread, accuracy tensile force, it’s safe, efficiency and easy tools  to tighten or remove bolts.  There are advantages of easy operate, small size, light weight, tensile force  output equably, high accuracy and simultaneous multiple tensioning, long  using life, less maintenances etc.  It’s widely applied in various industrial fields, electricity power, oil chemical  industry, steel, mining, cement, traffic, machines, military industry etc.

Technical Parameters