Abstract: The socket of the plug fastener is formed in its inside peripheral surface with axial grooves and at their rear ends is formed with a gear, each of the teeth of which has an inclined driving tooth face. The plug of the plug fastener comprises a head piece, which is adapted to be axially spring-loaded in the socket and is formed with radial ribs and is rotatably mounted in a driving sleeve of the plug. That driving sleeve is provided on its outside peripheral surface with radially and axially extending ribs and has a forward end face formed with prismatic teeth. The plug is adapted to be inserted into the socket with the ribs of the head piece and the ribs of the driving sleeve sliding in axial grooves of the socket.