Piston element assembly, and fuel injector with a piston element assembly

A piston element arrangement, in particular for an injection nozzle (1) for fluids, comprises a piston element (7) having at least one guide section (7a) and a central axis (7e); and a bore (9) in which the at least one guide section (7a) of the piston element (7) is guided longitudinally displaceably. The piston element arrangement has at least one surface structure (10) with a plurality of axially spaced apart interrupted, circumferential structures. An injection nozzle (1) is equipped with the piston element arrangement.