Fastening system

The invention relates to a fastening system (1) for fastening an add-on part (14) to a setting object (17) by means of a setting bolt (2) comprising the setting bolt (2) having a first end (3) and a second end (4), comprising a fastening section (5) and a load application section (6), a preferably ring or sleeve-shaped sealing element (10) having an opening (13) for sealing a setting bolt (2) inserted into the setting object (17) and the setting bolt (2) is arranged inside the opening (13), preferably the add-on part (14), e.g., a grating plate, an electric fastener or a spacer, for fastening on the load application section (6) of the setting bolt (2). According to the invention, corrosion on the setting bolt should be permanently avoided. For this purpose, the axial extension of the sealing element (10) is designed such that in the set state of the setting bolt (2) the sealing element (10) is supported on a first end (11) by the setting object (17) and on a second end (12) by the add-on part (14) and/or by the setting bolt (2).