Lengthened internal hexagonal wrench and machining process thereof

The invention relates to the technical field of hardware tools, in particular to a lengthened internal hexagonal wrench and a machining process thereof. The lengthened internal hexagonal wrench comprises a connecting rod and a wrench head, and one end of the connecting rod is welded to one end of the wrench head. The connecting rod is arranged at the top end of the wrench head, an extension mechanism is arranged in the connecting rod, and one end of the connecting rod is lengthened through the extension mechanism, so that the length of the whole internal hexagonal wrench is increased, and the internal hexagonal wrench can be suitable for special assembly conditions; and when an extension rod is pulled up and down, one end of a limiting column slides on the inner wall of a sliding groove, meanwhile, a spring in a mounting groove is compressed by a movable plate, when the limiting column slides to be parallel to a limiting groove, the elastic potential energy of the spring is released, one side of the movable p