Anti-Loosing Performance of Special Bolts and Nuts Having Enhanced Fatigue Life by Introducing Pitch Difference

Abstract

A slight pitch difference is considered between the bolt and nut in this study. Here, the pitch of nut is α μm larger than the pitch of bolt. For four different levels of α , the loosening experiment is performed. Considering both the antiloosening ability and the clamping ability of the nut, the desirable range of α is discussed. Based on the loosening experimental results, several levels of α are selected in order to clarify the effect of the pitch difference on the fatigue life of bolt. The most desirable pitch difference is discussed in terms of improving both anti-loosening and fatigue life.