Effect of Nut Height on Tightening and Untightening of Pitch Difference Nut

Abstract

In the authors’ previous researches, it is found that the bolt nut connections having pitch difference can realize both fatigue life improvement and anti-loosening performance successfully. The most desirable pitch difference for improving the fatigue life is relatively smaller than the most suitable pitch difference for improving anti-loosening performance. In this paper, the effect of the nut height on the tightening and untightening of the pitch difference nut is investigated experimentally and analytically. It is found that the suitable pitch difference range for anti-loosening can be reduced with increasing the nut height. Therefore, the larger nut height may realize both anti-loosening performance and high fatigue strength.