Abstract: A collet for accommodating varying axial loads in a mechanical assembly, includes a first sleeve designed to overlap in coaxial relation to a second sleeve, the second sleeve being formed in one end with a conical transition section rising from a cylinder section designed to be inserted on a spindle for supporting elements in the assembly, the first sleeve being caused to expand in radial direction as the sleeves are axially compressed, the expansion being controlled under guidance of the conical section of the second sleeve to produce an arcuate flange acting upon the conical section to provide a resilient, axial fixation of elements in the assembly.