Air spring strut

In an air spring strut consisting of a rolling bellows (1) that can be unrolled on an unrolling sleeve (3), a hydraulic vibration damper arranged within the rolling bellows (1) and/or the unrolling sleeve (3) with a piston rod (5) oscillating immersed therein, and upper and lower closure and fastening parts provided with seals, wherein O-rings (9, 10) are used as seals, in order to enable a simpler sealing between the closure and fastening device and vibration damper, which nevertheless permits secure sealing by means of O-rings (9, 10), it is provided that the O-rings (9, 10) lie in a respective one-sided axially and radially open shoulder of a first component, are supported radially on the second component, and are held and/or tensioned axially by a ring (14) connected to the first component or a disk (12).