Low-profile Clamp is the core component of OK-VISE Fixturing Concept.

OK-VISE low-profile clamps expand when they are tightened down, simultaneously pressing the workpieces against the guide and preventing their movement. They are designed to take up very little space on the fastening base. Small in size, yet with an excellent clamping force of up to 150 kN, these clamps guarantee a holding capacity that clearly exceeds the load of machining forces. Fastening with only one bolt ensures quick set-up times.

Low-Profile clamp

Our low-profile clamps work just as well on single machines as in large Flexible Manufacturing Systems. In most straightforward applications, the only additional investment needed are the fixed stoppers.
OK-VISE clamps are a reliable basic component of any workholding and fixturing system.

The workpieces will he held by force or form closure. Depending of the workpiece form, material and parameters of machining process, always on optimal jaw type can be chosen.

Tungsten Carbide Coating

Tungsten / diamond coated surface D

+3 stands for machinable model in B-series, +5 in D-series
Self-aligning jaws available in B- and D-series only
G = knive edge, G1 = one hard steel pin, G2 = two pins, G3 = 3 pins

Please notice, that in clamps (as well as in most stopper modules) two different jaw types can be combined.
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OK-VISE low-profile clamps come in four different sizes (A, B, D, F) for metric bolts (M5, M8, M12, M16), while the D-Series Inch Model is made for a half-inch bolt.





  D / inch


 Bolt size (metric) M5  M8  M12    M16
 Imperial bolt size 3/16"  5/16"    1/2"  5/8"
 Force up to (kN)  10  25  90  90  150
Force up to (lbs) 2 200 5 600 20 000 20 000 33 000
AMin...AMax (m Metric bolt sizem, compared to optimum) -2.9...+ 2.5 -1.9...+3.0 -3.3...+5.2   -4.9...3.3
Bolt offset (mm) 2 x 0.7 2 x 1.2 2 x 1.1   2 x 1.7

In B-series clamp the maximum clamping force is 25 kN which corresponds the force in a typical machine vise!
It is the most popular size today, followed by D-size which may be easier to handle manually and also the more popular in automated solutions.

The manual clamping is normally applied using an allen key with torque guage, however a power tool can also be utilised for convenience.

OK Vis clamp forces

When actuated with a bolt the models with ground surfaces have a high accuracy response between torque and the clamp force

The precision-ground surfaces of OK-VISE Low-profile clamps quarantee consistantly accutate clamping force.

We have attached the torque-force graph to enable the most suitable clamping force & torque selection.

x = torque ( Nm), y = force ( kN )  

OK Vis clamp forces wrench

In addition to above mentioned clamp sizes and various jaw types, OK-VISE clamp superior designs differ from its competition in a number of important ways 

Pull-down clamps

Where standard model single-wedge clamps always keep workpieces steadily in place, not allowing
upward or downward movement, pull-down clamps also generate pull-down action and press workpieces towards the fixture base.

Stainless steel model

Originally designed for EDM applications, stainless steel clamp is used today in many harsh environments like welding appliations

Economy models (-O)

Some of our customers prefer our economy-series, which works sufficiently well in applications where absolute repeatability, high clamp accuracy and extremely high pressing forces are not necessary.
In economy models, only the bottom of the jaw is ground.
Our smallest series is only available as the economy model (AK2-VT-SO).

D-series inch models (-VTI, -WTI)

You can fasten the clamps with bolts of both metric and imperial dimensions for A-, B- and F-size clamps.

For D-size clamps, there are separate models to be used with an imperial half-inch bolt.
The center holes of inch-series wedges are wider in order to fit the half-inch socket head screw.

Following clamp types have two jaws which are both same type (exept self-aligning models).





  D / inch


Serrated basic version   BK2-VT DK2-VT DK2-VTI FK2-VT
Smooth basic version   BK2-VT-S DK2-VT-S DK2-VTI-S FK2-VT-S
Grip jaw models   BK2-VT-Gn DK2-VT-Gn DK2-VTI-Gn FK2-VT-Gn
Models with machinable jaws   BK2-VT+3 DK2-VT+5 DK2-VTI+5 FK2-VT+5
Machined cross V models   BK2-VT-C DK2-VT-C DK2-VTI-C FK2-VT-C
Additional piece models   BK2-VT-T DK2-VT-T DK2-VTI-T FK2-VT+5
Self-aligning model   BK2-VT-B DK2-VT-B DK2-VTI-B FK2-VT-B
Self-aligning model, two jaws   BK2-VT-E DK2-VT-E DK2-VTI-E FK2-VT-E
Single-wedge pull-down, serrated   BK2-VT-PD DK2-VT-PD  DK2-VTI-PD FK2-VTI-PD
Double-wedge pull-down, serrated     DK2-WT DK2-WTI FK2-WT
Double-wedge pull-down, smooth     DK2-WT-S DK2-WTI-S FK2-WT-S
Stainless steel model   BK2-VT-SS      
Economy-series, serrated jaws   BK2-VT-O      
Economy-series, smooth jaws AK2-VT-SO BK2-VT-SO      

Normally the end of the code is describing the jaw type, for example -T stands for a model with two additional pieces.
Self-aligning models (-B) have two types of jaws, smooth and serrated. 

There are plenty of accessories available for Low-profile clamps, like bolts, protection plates and components to prevent the clamp from rotating while clamping.
Also, components of the clamp are available as spare parts.

In addition to this, please study also the modules in the systems for Dedicated Fixturing and Generic Purpose Systems, not to forget Generic components that can be used with most of the systems.