The Fastener Tensile-Torsion Testing Machine is primarily designed for evaluating the tensile-torsion performance of nuts. It is capable of performing the following tests: Standard Locking Torque Tests for self-locking nuts. Torque Loading Tests and Axial Force Loading Tests. Preload Release Mechanism: Axial forces can be unloaded without rotating the nut, enabled by an axial force sensor integrated with a self-unloading device.