Self-locking products: pre-applied TECNOFREN® renders any threaded connection self-locking, sealed, adjustable and reusable. During the screwing up process, TECNOFREN® is distributed between the thread and the female screw, and eliminates the spaces between the threads, thus increasing the metal to metal contact and exerting strong, long-lasting resistance to loosening and vibrations. TECNOFREN® exploits the elastic deformation properties of polyamide.