An Innovative Solution for Safety Fastening System with Assured Tensile Stress and Prevailing Torque

The guarantee of fastening on assembled joint is still a challenge for the designers, especially regarding the torque loss and consequent loosening of the fastening elements. Among the main reasons of accidents caused by the loosening of these elements, there is the incorrect way to apply the torque on the assembly line (too high or too low) and the possibility of jeopardizing the joint fastening due to vibration acting on the system.

This paper presents a solution of fastening where the resistance of the joint loosening is given by the simultaneous application of tensile effort and prevailing torque on the elastic field of the component, which decreases the possibility of self-loosening.