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Electric Stud Drive Tool (ESDT)

Hydratight's Electric Stud Drive Tool (ESDT) is now available under the Enerpac brand. Visit for product information.

Hydratight’s nuclear engineers converted and upgraded the earlier pneumatically driven Stud Drive Tool (SDT) to electric power. The new Electric Stud Drive Tool (ESDT) offers smooth, quiet operation in a noisy environment and relieves workers from the dangerous role of absorbing breakaway torque during stud rotation.

Its electronic control provides an exact stud positioning during thread-in to assure consistent stud projections around the vessel and to prevent binding due to hitting the bottom of the stud hole.

Stud weight compensation can be provided by connection to plant air supply or via a built in air compressor.


  • Load compensation provides zero stud weight effect during operation
  • Quick connect stud gripper
  • Electric drive provides smooth and quiet operation
  • Height of the stud during threading/unthreading is monitored and displayed on the digital read out indicator


  • Safely threads studs in and out of the nuclear reactor pressure vessel (RPV) in minutes
  • Easy to handle, position and operate by one person
  • The operator doesn’t experience any harmful torque during stud rotation
  • Pneumatic weight compensation keeps the stud ‘weightless’ during rotation which prevents any stud, stud hole or thread damage.

Read more about Hydratight’s Self Contained Tensioner (SCT) used to tighten reactor pressure vessel head studs.

Electric Stud Drive Tool (ESDT)

Download technical information about this product:


English PDF Document, 1.2 MB
English PDF Document, 1.2 MB

Technical data

English PDF Document, 358.7 KB
English PDF Document, 358.4 KB