
Hydraulic modules
OK-VISE Hydraulic Actuators
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.

Applications
Multi-Rail RM Units + Hydraulics
Continuous hydraulic connection with horizontal machining center.
Grid System + Hydraulics
Continuous hydraulic connection with vertical machining center.
Blank System + Hydraulics
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
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
Compared 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
Installation
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 support@ok-vise.com.
OK-VISE CLAMPS
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.
Powerplate concept
The Powerplate concept gives users the most straightforward access to automation.
Hydraulic actuators (from 1 to 7 pcs) are built-in under a base plate, and the cylinder package can also be moved to various additional positions under the plate for optimal clamping. So,either a single workpiece can be clamped alone or up to 14 pcs simultaneously.
The Hydraulic actuator normally uses HA-VD1, creating a 29 kN clamping force with 350 bar maximum hydraulic pressure.
Fixtures can also be built on sub plates, which can be rapidly changed using a built-in Ball-Lock quick-change system.
Generic-purpose OK-VISE Fixturing Concept components like Multi-Rail RM units can be installed directly on the plate.
There are two sizes as standard: 240x400 mm and 400x700 mm.
Hydraulic actuator sets HA-JB1, HA-JD1, HA-VB1 and HA-VD1
In addition to hydraulic actuators (= cylinders) these sets include all the adapter bolts and fittings required to automatize B- or D-series clamps.
Depending on the clamp size, a 8 mm or 12 mm bolt goes through the clamp and fixture plate to the cylinder ‘s piston. The base cylinder is bolted on to a fixture plate.
The cylinders in the sets are single-acting, enabling the simplest possible actuation of OK-VISE clamps
PP2VD5-2440A Powerplate unit
PP2VD5-2440A with RM option
Plate size 240 x 400 mm.
Hydraulic cylinder package ( 2 actuators ) can be installed in the middle or at the end of the plate.
Positioning holes for RM-400 Multi-Rail units are included.
Applications
POWERPLATE WITH SUB-PLATE
Hydraulic actuator HA-VB1
Code | Dimensions | STEP |
HA-VB1 | ![]() | ![]() |
- Single acting cylinder with spring return
- Cylinder stroke 4,5 mm creates 2 x 2,0 mm clamp jaw movement
- M8 thread
- Height 51 mm
- JIC 1/4 connection
- Recommendation max 350 bar
Piston area/ pull (cm2) | 3.8 | |
Piston force (kN) | ||
at 250 bar / pull | 9.5 | |
at 350 bar / pull | 13.1 | |
Clamp force (kN) using BK2-VT clamp in standard conditions | ||
at 250 bar / pull | 7.0 | |
at 350 bar / pull | 9.7 |
Hydraulic actuator HA-VD1
Code | Dimensions | STEP |
HA-VD1 | ![]() | ![]() |
- Single acting cylinder with spring return
- Cylinder stroke 8 mm creates 2 x 3,3 mm clamp jaw movement
- Height 67 mm
- JIC 1/4 connection
- Recommendation 350 bar max
Piston area/ pull (cm2) | 11.6 | |
Piston force (kN) | ||
at 250 bar / pull | 29.0 | |
at 350 bar / pull | 40.0 | |
Clamp force (kN) using DK2-VT clamp in standard conditions | ||
at 250 bar / pull | 20 | |
at 350 bar / pull | 31 |
Installation principle
Hydraulic actuator HA-JB1
Code | Dimensions | STEP |
HA-JB1 | ![]() | ![]() |
- Hollow-rod cylinder
- M8 thread
- Height 48 mm
- Cylinder stroke 6,1 mm creates 2 x 2,6 mm clamp jaw movement
- JIC 1/4 connection
- Recommendation max 250 bar
Piston area/ pull (cm2) | 6.2 | |
Piston force (kN) | ||
at 250 bar / pull | 14.9 | |
at 350 bar / pull | 20.9 | |
Clamp force (kN) using BK2-VT clamp in standard conditions | ||
at 250 bar / pull | 11 | |
at 350 bar / pull | 15 |
Hydraulic actuator HA-JD1
Code | Dimensions | STEP |
HA-JD1 | ![]() | ![]() |
- Hollow-rod cylinder
- M12 thread
- Cylinder stroke 7,8 mm creates 2 x 3,3 mm clamp jaw movement
- Height 58 mm
- JIC 1/4 connection
- Recommendation max 250 bar
Piston area/ pull (cm2) | 12.3 | |
Piston force (kN) | ||
at 250 bar / pull | 29.6 | |
at 350 bar / pull | 41.4 | |
Clamp force (kN) using BK2-VT clamp in standard conditions | ||
at 250 bar / pull | 22 | |
at 350 bar / pull | 31 |