Detachable fastening device

A detachable fastening device, comprising:

• a socket, comprising:
• an external mounted base comprising a limiting flange;
• at least one first depression located at the external mounted base;
• and
• a fastening end;
• a fastener detachably connected to the socket and comprising:
• a central hole having an inner engaged wall coordinated with the external mounted base, wherein the inner engaged wall comprises a concave end corresponding to the limiting flange;
• and
• at least one second depression located at the inner engaged wall;
• and
• a positioning mechanism received between the at least one first depression and the at least one second depression to position the socket and the fastener;
• wherein a length of the fastener is shorter than half of a length of the socket, an outer diameter of the limiting flange is larger than an outer diameter of the fastening end, an axial thickness of the limiting flange is equal to an axial thickness of the concave end, and when the fastener is assembled with the socket, the fastener is moved upward until the concave end is abutted against the limiting flange, and the fastener is located between a central point of the socket and an end surface of the socket.