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In this study, by applying three-dimensional FEM, the nut screwing process is analyzed to obtain the prevailing torque  T pconfirming anti-loosening. Since the nut unscrewing properties after the nut tightening is more important to prevent the nut self-loosening, the nut unscrewing is also analyzed to obtain the residual prevailing torque  T punewly defined in this process. Both results of  T pand  T puare in good agreement with the experimental results. With increasing the pitch difference, the residual prevailing torque  T puincreases as well as the prevailing torque  T p.

Prevailing torque and residual prevailing torque of Bolt-Nut connections having slight pitch difference