Single-stage Self-return hydraulic bolt tensioner  BHC series single stage self-return hydraulic bolt tensioner.  Self-return plunger,Website:http://www.dudemachinery.com, suitable for frequent use.  Suitable for extend bolts of single specification, high accuracy.  It can be driven by hand pump, pneumatic pump or electric pump. Several tensioners can work together simultaneously.  Standard working pressure: 150Mpa  Application range: to tighten or loosen bolts of big machines in ship building plants, steel plants, fire power plants, wind power plants and nuclear power plants.  5. It will be designed specially as per its particular working spaces.