What factors can contribute to looseness when Hard Lock Nuts are used?
There are two factors with respect to looseness, namely a relative rotation of the nuts against the counterpart bolt and a decrease in bolt-axial tension.Loosening of the nuts due to rotation is limited to the following cases in which the wedge-effect does not function. Where the upper concave nut is not tightened with the specified torque Where after repeated use, the upper nut is deformed and does not function Where the nuts have been incorrectly installed Next, potential factors contributing to a decrease in bolt- axial tension include the following. Where the lower convex nut is not sufficiently tightened Where axial tension between the nut and the corresponding bolt decreases after a considerable lapse of time following the initial clamping. Where the clamped part becomes deformed over time Where he clamped part becomes embedded causing the nuts loosen Where dissimilar products made of metals with different coefficients of linear expansion are fastened in conditions subject to sig
