Linear adjuster, which comprises a first end, a second end, which with respect to the spindle longitudinal axis is situated opposite to the second end, a first adjustment part, and a second adjustment part, the linear adjuster comprising: a spindle-and-spindle-nut mechanism which comprises a spindle and a spindle nut, wherein the spindle-and-spindle-nut mechanism, due to the rotation of the spindle and the spindle nut, adjusts the first adjustment part and the second adjustment part relative to one another into in adjustment states with different positions relative to a spindle longitudinal axis, wherein the first adjustment part comprises a first main body at the first end of the linear adjuster and a first stop device, which extends from the first main body in the direction of the spindle longitudinal axis toward the second end, wherein the second adjustment part comprises a second main body at the second end of the linear adjuster and a second stop device, which extends from the second main body in the direction of the spindle longitudinal axis toward the first end, characterized in that the first stop device and the second stop device come into a stop state, in which the first stop device and the second stop device are in contact with one another with mutually facing surfaces (35a, 45a, 36a, 45b), when the linear adjuster executes a stop adjustment movement with a reduction of an adjustment length during a retraction movement, and the first adjustment part and the second adjustment part are located in a predetermined respective stop travel position relative to one another, wherein, by means of a fixation device, the first stop device is mechanically fixed to the first main body or the second stop device is mechanically fixed to the second main body in a stop provisioning state, in which the stop state occurs during the retraction movement, and wherein, after releasing the mechanical fixation of the fixation device, the linear adjuster is in a stop release state, in which the adjustment parts (10, 20) are movable from the stop travel position with the spindle-and-spindle-nut mechanism relative to one another in the retraction movement and the extension movement or, alternatively thereto, reatliv to each other in the retraction movement and the extension movement. a spindle-and-spindle-nut mechanism which comprises a spindle and a spindle nut, wherein the spindle-and-spindle-nut mechanism, due to the rotation of the spindle and the spindle nut, adjusts the first adjustment part and the second adjustment part relative to one another into in adjustment states with different positions relative to a spindle longitudinal axis, wherein the first adjustment part comprises a first main body at the first end of the linear adjuster and a first stop device, which extends from the first main body in the direction of the spindle longitudinal axis toward the second end, wherein the second adjustment part comprises a second main body at the second end of the linear adjuster and a second stop device, which extends from the second main body in the direction of the spindle longitudinal axis toward the first end, characterized in that the first stop device and the second stop device come into a stop state, in which the first stop device and the second stop device are in contact with one another with mutually facing surfaces (35a, 45a, 36a, 45b), when the linear adjuster executes a stop adjustment movement with a reduction of an adjustment length during a retraction movement, and the first adjustment part and the second adjustment part are located in a predetermined respective stop travel position relative to one another, wherein, by means of a fixation device, the first stop device is mechanically fixed to the first main body or the second stop device is mechanically fixed to the second main body in a stop provisioning state, in which the stop state occurs during the retraction movement, and wherein, after releasing the mechanical fixation of the fixation device, the linear adjuster is in a stop release state, in which the adjustment parts (10, 20) are movable from the stop travel position with the spindle-and-spindle-nut mechanism relative to one another in the retraction movement and the extension movement or, alternatively thereto, reatliv to each other in the retraction movement and the extension movement.