AT Series torsional hydraulic actuators are used for torsion loading of test specimens. The actuators have two wings with limited angle of rotation.
The construction of the actuators is optimised for high speeds and frequency of loading. The actuators are built for high radial and axial loading of their shaft. Radial bearings are either hydrostatic or needle.
Axial bearings are either hydrostatic or plain. All body and rotor parts that can come in contact by overloading, as well as journal bearings, are protected by a plastic coating.
Working pressure of the actuator is 28 MPa and it attains its nominal force under a pressure of 25 MPa.