Higher performance evaluation and the control of increasing levels of dynamic stress in the fields of mechanical engineering are only capable by the use of high quality machine elements. At the same time the required functions have to be realized in a most cost-effective way. SPIETH locknuts offer an interrest solution for modern engineering:
The locknut is constructed on a rotationally symmetrical basis without any imbalancing elements such as grooves, slots etc. The clamping screws distributed evenly around the periphery work in conjunction with the ideally configured elastic diaphragm of the locknut on the spindle thread to provide even clamping forces all way round. The clamping forces ensure intensive contact between the thread flanks of the nut and bolt, resulting in a high degree of axial rigidity around the entire periphery of the nut (eliminating soft spots). This design feature excludes the possibility of the misalignment and surface compression which occur in conventional nuts as a result of subjection to operating loads. The resulting reduction in axial pretension is compensated by applying a higher moment of pretension. The end face of the locknut can be aligned until completely free of play. lf necessary, it is possible to compensate for unilateral tension caused as a result of minimal axial run-out errors in the connecting elements by tightening the clamping screws individually. Unilateral tensions are often the cause of poor concentricity in mounted spindles. Despite a spindle thread produced to ISO standards, flank play can be restricted during mounting right down to zero, so permitting precision adjustment of the locknut's contact surface.
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