Abstract
Bolt/nut assemblies are basically designed so as to avoid the stripping fracture mode on mating threads. From this viewpoint, mechanical properties of nuts are designed and specified in the International Standards. However, the design has been done only for hexagon nuts. This study aims to develop the design methodology applicable to nut with flange. The experiment and the simulation by FEM are perfomed the nut dimensions (height and width across flats), the shape of flange and the thread tolerance grade are selected as variables. The results show that not only the nut height but also the width across the flats affects significanttly on the stripping strength of the mating threads.
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