The original inventor of the wedge-operated low-profile clamp, OK-VISE, has introduced a new method of Hydraulic clamping. Innovative design of the hydraulic actuators is optimized to utilize the maximum effectiveness the key property of the OK-VISE clamps - extreme clamping force in a small space combined with the accuracy of the clamping force.

As an integral part of the OK-VISE Fixturing Concept, hydraulic actuators can be used to build genuinely modular fixtures.

Hydraulic clamping can be used in combination with:

  • Automated or manual workpiece loading
  • Vertical or horizontal machining centers and 5-axis machines
  • A continuous pressure source or a hydraulic connection that is uncoupled after loading.

    hydraulic actings


Hydraulic pressure (p) is first converted to the downwards force and by the use of the clamping force of the wedge clamp(F) is applied in two directions. Just like in manual clamping, a stopper is needed on both sides of the clamp.

The simplest way of creating a hydraulic fixture is to use a a single acting hydraulic actuator. Please note that in the double acting hydraulic actuator, pushing force is stronger than the pulling force.


Multi-Rail RM Units + Hydraulics

Grid System + Hydraulics

Blank System + Hydraulics

 mrh  gsh  bsh
Continuous hydraulic connection with horizontal machining center. Continuous hydraulic connection with vertical machining center. The hydraulic connection is disconnected after loading. Used in the FMS systems.

There are copule of ways for easy access to automated clamping

  • Using hydraulic cylinders
  • Powerplate concept


Retro-fit option

retro fit option

OK-VISE hydraulic modules can also be used with manually operated fixtures. This is the easiest way to enter the world of an automated clamping!

Benefits of hydraulic clamping

HA-2S1 HA-1S1Compared to manual clamping, using hydraulic clamping in the system ensures a consistent clamping force on the workpiece, makes clamping process faster and enables automated or robotic loading of workpieces.

Compared to the other hydraulic systems on the market, the OK-VISE hydraulic clamping module:

  • is based on the world-renowned wedge clamp  
  • has a wedge design that hinders compression of hydraulic oil  and prevents vibration
  • creates clamping force with a pull stroke
  • has a return stroke performed by a spring or hydraulics
  • uses a HA-Series actuator designed for 350 bar pressure, hence a compact size

Some basic components

hydraulic comp



Fixturing assembly can be supplied together with the hydraulic actuators. OK-VISE partners from the global distribution network offer assistance with the hydraulic installations. Sample connection diagrams are available from


all based on original

OK-VISE low-profile clamps are worldwide known for their quality and accuracy. D-series and B-series clamps are particularly recommended for use with the OK-VISE hydraulic actuators.

Download the brochure

core 2017 fixturing16