A securing element for securing a spindle in a bushing, in particular for a medical stand device, includes a supporting portion configured to arrange the securing element in a predefined axial position on a supporting apparatus of the stand device, and an engagement portion configured to interact with a spindle rotatably supportable about an axis of rotation in the supporting apparatus, or a pin of the stand device, to secure the spindle or pin in a predefined axial position relative to the supporting apparatus rotatably within the supporting apparatus. The securing element can be supported in at least one radial position on the supporting apparatus, in particular in a mounting preparation position and/or a securing position, wherein the engagement portion is configured to interact with the spindle or the pin by engagement in the radial direction, in particular in the securing position. The securing element may also be secured in several radial positions and comprise coupling portions that are formed correspondingly. Also disclosed are components correspondingly formed to the securing element, in particular a supporting apparatus, a cover for the supporting apparatus, and a coupling element； and a securing system, or a securing mechanism, or a mounting set each comprising at least one securing element according to the invention.
