The invention relates to a stand apparatus, which can be built and assembled/disassembled in a modular manner. The invention relates in particular to a bushing (20) for a stand apparatus (1) for arrangement in the operation theatre, comprising a coupling part (21), by means of which the bushing (20) can be mounted on a connecting component (3) of the stand apparatus about a rotational axis (D) and/or along the rotational axis in a height-adjustable manner, in particular on a spindle and a section on which the bushing (20) can be connected to a support arm (13) of the stand apparatus (1) wherein the section is a mounting section (25), by means of which the bushing (20) can be mounted on the support arm in a reversible manner, in particular by means of one or more fastening means (40). The invention further relates to a support arm (13) for fastening to a bushing (20) and a support system, comprising at least one such bushing (20) and such a support arm (13).
