A fastening device (1) for fastening mechanical element (2) with support structure (3) to fasten a cabin fitting element to a frame of an aircraft, fastening device (1) includes: enclosure (4) mountable to support structure (3); locator bush (5) in enclosure (4 and slidable along longitudinal axis (X) in an unlocked position of the fastening device (1); retaining element (6) around the longitudinal axis (X) and mechanically coupled to locator bush (5); and locking bolt (7) with a bolt head (8) mounting mechanical element (2) between bolt head (8) and enclosure (4), wherein locking bolt (7) is slidable into locator bush (5), and locking bolt (7) has a recess (9) on at least a section of a shell surface of locking bolt (7) and is positively-locking connectable with retaining element (6).