Work Supports

Hydra-Lock jacks are designed to be locked with no movement of the plunger. Light springs, or jets of air pressure, bring the plunger into deflection-free contact with the work piece, making our jacks unique among standard work supports.

When the part is properly located, the hydraulic line is opened and all jacks in the system are simultaneously locked, providing rigid support in all required areas for machining or grinding operations.

Hydra-Lock designs and produces a number of jacks that can be easily installed in existing or newly designed fixtures. We have an extensive set of designs where multiple units can be operated simultaneously, including:

  • Rectangular jack
  • Threaded body jack
  • Doughnut jack
  • Cylindrical jack

All jacks (except doughnut) have these features in common:

  • Ported for single or multiple operation
  • Series or parallel circuits from a single hydraulic line
  • Replaceable plungers (can be designed for your part)
  • Protection from coolant and chips
  • Very high support values (depending on hydraulic input)
  • Instantaneous action from a single valve


All work support designs can be customized to suit your requirements.

Custom Work Supports (Jacks)

Zero Deflection - Unique hydraulic locking action prevents all axial movement

These custom work supports (jacks) have these common features:

  • Ported for single or multiple operation
  • Series or parallel circuits from single hydraulic line
  • Replaceable plungers can be designed for your part
  • Protected from coolant and chips
  • Very high support values depending on hydraulic input
  • Instantaneous action from a single valve