Wedge-screw grips combine the mechanical properties of screw and wedge grips. Thickness adjustment and generation of initial clamping force take place via a screw thread acting on both wedge jaws, eliminating specimen slippage. The main gripping force is achieved by a wedge effect.

• Gripping force is proportional to the actual tensile force (self-clamping), ensuring reliable gripping of a wide range of materials.
• Large clamping length keeps surface pressure low, avoiding jaw breaks.
• Most wedge-screw grips are synchronized, i.e. the jaws close and open symmetrically, ensuring centrical clamping of symmetrical specimens.
• With wedge-screw grips from 10 kN capacity upwards the synchronization can be switched out.
• The jaws can be set both symmetrically and asymmetrically, making these grips also suitable for tests on overlapping shear specimens, e.g. welded or bonded specimens.
• Wedge-screw grips from 50 kN capacity can optionally be operated by a pneumatic motor, i.e. the initial gripping force is applied via the motor, simplifying clamping operations for the user.
• Optional T-slot shoe connector system allows small load cells, specimen grips, fixtures and other test devices to be fitted without dismounting the grips - a great time-saver.