Vehicle axle with air spring

The spring has a plunger (8) connected with rolling bellows and functioning as a contact surface (8a) for the bellows during compression. A lower surface of the plunger is supported on top side of a chassis part i.e. semi-trailing arm, that is provided with a floor space (26) formed around a central fastening opening. A structure of the plunger downwardly projects in relation to a level of the floor space for rotation lock of the plunger. The structure is designed as a projection or a group of projections that are distributedly arranged around the central fastening opening.