Jump to the content of the page

Wedge Screw Grips

  • Metals
  • Plastics
  • Wood
Test load
  • 500 N - 250 kN
Specimen shape
  • Round specimens
  • Flat specimens
Type of test
  • Tensile

The right combination

Wedge screw grips combine the mechanical properties of screw grips and wedge grips.

Thickness is adjusted and a preload force is generated via a screw action, which helps prevent specimen slipping at the beginning of the test. 

Advantages & features

Switchable synchronization function


  • The main gripping force is generated by the wedge action.
  • The gripping force is proportional to the actual tensile force (self-clamping), ensuring secure gripping of a wide range of materials.
  • Large grip-to-grip separation allows the surface pressure to be kept low, avoiding jaw breaks.
  • The larger grips (from Fmax 50kN) can remain in place while small load cells, specimen grips, test fixtures, and test devices are attached to them via the optional mounting unit— great time-saver.
  • Wedge screw grips with Fmax 50 kN and above can be operated via a pneumatic motor, These specimen grips are opened and closed by a
  • pneumatic motor; the pneumatic actuator is located directly on the specimen grip
  • Low overall height.
  • Strain rate control in accordance with standards DIN EN ISO 6892-1:2009 and ASTM E8 – 09.

Switchable synchronization function

Switchable synchronization allows wedge screw grips (Fmax 10 kN and above) to grip both symmetrically and asymmetrically. The asymmetry level is easily adjustable and is maintained reliably, even with regripping. One-handed operation is possible with either hand, including with asymmetrical specimens, ensuring that the specimen attachment point is always in the test axis.

Technical overview

Do you have any questions regarding our products?

Please feel free to contact our product experts.
We look forward to discussing your needs.


Contact us

Related products and accessories


Name Type Size Download
  • Product brochure: Specimen Grips and Test Tools PDF 4 MB
  • Product information: Wedge screw grips, Fmax 500 N / 2,5 kN PDF 530 KB
  • Product information: Wedge screw grips, Fmax 10 kN PDF 396 KB
  • Product information: Wedge screw grips, Fmax 10 kN / 30 kN PDF 681 KB
  • Product information: Wedge screw grips manual, Fmax 50 kN/100 kN/150 kN PDF 580 KB
  • Product information: Wedge screw grips manual, Fmax 250 kN PDF 161 KB
  • Product information: Wedge screw grips motorized, Fmax 250 kN PDF 535 KB