Common Features of the Wedge-Screw Grips

Wedge-screw grips combine the mechanical properties of screw grips and wedge grips. Thickness adjustment and generation of initial gripping force are via screw action, eliminating slippage of the specimen at the beginning of the test.

• 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 different materials
• Large grip-to-grip separation allows the surface pressure to be kept low, avoiding jaw breaks
• The larger grips can remain in place while small load cells, specimen grips, test tools and test devices are attached to them – a great time-saver
• Wedge-screw grips with Fmax 50 kN and over can optionally be operated via a pneumatic motor, while opening and closing of the grips is by means of an electric motor; the control for this is located directly on the grips
• Low overall height

Switchable synchronization allows wedge-screw grips (Fmax 10 kN and over) to grip both symmetrically and asymmetrically. Asymmetry is easy to set and is maintained securely even after re-clamping, enabling one-handed operation (with either hand) for asymmetrical specimens also and ensuring that the specimen attachment point is always in the test axis.