Double-end stud

The utility model discloses a mechanical part connection element, and provides a double-end stud. The double-end stud comprises a connection rod, a short screw and a long screw, wherein the short screw and the long screw are arranged at the two ends of the connection rod and are connected with the connection rod integrally. The head portion of the short screw is provided with a pressing rod. When the short screw provided with the pressing rod on the head portion is screwed into a body thread hole for an enough screwing length and the threaded root portion of the short screw is not screwed into the body thread hole, the pressing rod abuts against the bottom of the body thread hole firstly, and then the double-end stud is fixed to a body with the dependence on pressing force of the pressing rod and the bottom of the main thread hole.