Method for braking a nut in material with a low plastic deformation

The known methods for braking a nut by radial deformation of the wall are unsuited to low plastic deformation capacity material at room temperature because of the formation of microcracks in the thickness of the wall of the nut and variability of the braking torque thus obtained. In addition, alternatives to the braking principle by deformation such as for example the addition of a polymer ring make more complex and expensive to manufacture. The method of the invention solves the technical problems without having to modify the morphology of said nuts nor their overall dimensions as imposed by many existing standards and specifications. In the invention, the nuts made in such materials with a low plastic deformation, are heated locally immediately before performing the braking deformation, for a short time at a sufficiently high temperature to increase the plasticity without risking d affect the metallurgical and microstructural characteristics. The optimum temperature range is determined from the experimental curves of heat distortion of the various materials considered.