Threaded joint with anti-unscrewing device

A threaded joint comprising:

• a male end having a male thread and a free male end;
• and
• a female end having a female thread and a free female end, the female thread configured to directly engage the male thread to connect the male end to the female end,
• wherein said female end also includes at least one extension extending axially from the side of the female thread and forming the free female end,
• wherein said at least one extension is configured to flex radially and includes on an internal surface an extension shoulder arranged to cooperate with a radial shoulder of a locking surface extending from an external surface of the male end and to limit axially in one direction the relative movement of the male end relative to the female end, and
• wherein the at least one extension of the female end comprises a plurality of extensions separated by recesses and distributed circumferentially, each extension being radially flexible and comprising on its internal surface an extension shoulder arranged to cooperate with the radial shoulder of the locking surface and to limit axially in one direction the relative movement of the male end relative to the female end.