There are many manufacturers of machines for Bolt and Tensioning, Torqing, etc., most of which incorporate an air driven liquid pump as the hydraulic power means. These machines are normally used to accurately tighten large diameter bolts, the type found on large turbines, generators, compressors, engines, etc., where the use of spanners is impracticable or laborious. Hydraulic force is used to stretch the bolt.

The nut can then be easily run down the stud up to the flange face where it is seated. The hydraulic pressure is then released, the bolt tensioned and the Operation is complete.

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