At present, the safety of threaded connection in the manufacturing, production and maintenance of aerospace engines has been highly valued. Especially for self-locking nuts, because of their good shock resistance, loosening resistance and reusability, they have become a widely used thread in the aviation industry. Connect the components. The self-locking nut uses plastic deformation to form friction on the thread pair to prevent the thread from loosening. However, the self-locking torque between the thread pair will gradually decrease during repeated use, especially in the case of engine impact or significant load changes obvious.