Common Features of the Screw Grips

In screw grips the gripping force is applied manually or via an electric motor. These grips are used mostly for smaller test loads (from 20 N to max.50 kN) and thinner specimens – fine wires, fibers, films.

• The gripping force depends on the screw torque and grip compliance
• Very easy to operate
• Large opening widths for flexibility in use
• Most commonly used screw grips are U-shaped for good accessibility
• Simple design principle enables standard version to be resistant to high temperatures
• Depending on type these grips have an axial bearing in the gripping unit for increased gripping forces
• Many screw grips feature free adjustment of both jaws, allowing asymmetrical specimens to be tested

These grips are particularly suitable for tests involving very low forces. Their weight is sufficiently low in relation to the nominal force of the attached load cell as to impose no restrictions on the force measurement range of the load cell. The gripping force is generated by a spring. The spring force can be pre-set, allowing clamping-sensitive materials always to be tested using the same gripping force.