Self-loosening of bolts and nuts is a significant issue for bolted fasteners. In recent years, this problem has been a hot topic in the field of pressure vessels and piping. Several research papers have been presented from several institutes and the mechanism and phenomena have been almost understood. This paper offers a countermeasure based on the authors’ long time research activity on the non-loosening performance of various types of nuts. Their research has indicated that prescribed plastic deformation of nut heads may prevent or decrease loosening. This phenomenon was reproduced using Finite Element Analysis.

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