Abstract: A fastening device of a plug-socket combination includes a plug structure and a socket structure. The socket structure has a side wall in which an insertion slot is formed. A plastic fastening plate includes a slit-defined barb formed on each of two sides of a lower end thereof. When the plastic fastening plate is inserted into the insertion slot, the slit-defined barbs are allowed to elastically expand to respectively engage pawls formed at a lower end of the slot. The plastic fastening plate has a free end on which a plastic pawl is formed. The plug projection of the plug structure, when jointed, through insertion, to the insertion recess of the socket structure, smoothly passes over the plastic pawl to allow the plastic pawl to spring into and thus fix the positioning cavity at the time when the positioning cavity and the plastic pawl are in alignment with each other.

Abstract: A fastening device of a plug-socket combination includes a plug structure and a socket structure. The socket structure has a side wall in which an insertion slot is formed. A plastic fastening plate includes a slit-defined barb formed on each of two sides of a lower end thereof. When the plastic fastening plate is inserted into the insertion slot, the slit-defined barbs are allowed to elastically expand to respectively engage pawls formed at a lower end of the slot. The plastic fastening plate has a free end on which a plastic pawl is formed. The plug projection of the plug structure, when jointed, through insertion, to the insertion recess of the socket structure, smoothly passes over the plastic pawl to allow the plastic pawl to spring into and thus fix the positioning cavity at the time when the positioning cavity and the plastic pawl are in alignment with each other.