Abstract: The invention relates to a plunger piston system made preferably of glass fiber-reinforced plastic or similar composite material to support and guide the pneumatic spring bellows of an air suspension axle of a commercial vehicle or the like, with a plunger piston, which has an essentially cylindrical plunger piston skirt with a bottom foot region for the connection with an air spring bearing arm and an upper, preferably essentially semi-circular plunger piston edge, which adjoins the plunger piston skirt and which transforms preferably at an angle from the outside inwardly into a trough section that is equipped with a preferably, in any event region by region, essentially level trough base, having an opening for the passage of a bolt for a friction lock connection with a base of the air spring bellows, and that preferably forms a truncated conical trough for preferably form-locked reception of the convex base of the air spring bellow, whereby to simplify the production and yet improve the stability a supporti