The ADMET eXpert 81T series table top torsion testing machines are available in vertical or horizontal orientations. Systems employ a linear slide design for maximum torsional stiffness and minimal axial friction. A reaction torque transducer is attached to a movable tail stock mounted on a linear slide. The tail stock can be left free floating or clamped during testing. All torsion testers feature unlimited rotation in both directions and are suitable for static and fatigue testing.