THREADED TUBULAR ELEMENT

1. A threaded tubular element, male or female (2, 51, 62) having an anti anti-fatigue profile for threaded tubular joint (100, 200) and resistible against external mechanical effect both statically and cyclically changing realized at the end of the pipe (101, 102, 202), containing a male thread on the external peripheral surface or female thread (4) on the internal peripheral surface such as said threaded element is male or female, wherein said threaded tubular element comprises a cut in form of groove (30, 31) of the wall of threaded element (3, 4) on the peripheral surface (103, 104) of the threaded tubular element opposite to that surface, where the thread is made without affecting the geometries of threads (11, 12) of the threading, characterized in that the wall under the threading is reduced by means of annular groove (30, 31)at least on the level of the first threads to be engaged in such way to decrease the stiffness. 2. Threaded tubular element, according to claim 1, characterized in that the annular groove begins under the first thread to be engaged (21, 22). 3. Threaded tubular element, according to claim 1 or 2, characterized in that the annular groove ends on the axial interval between first section of the threading and the threading, located on the level of the last threads to be engaged. 4. Threaded tubular element, according to any of claims 1-3, characterized in that the annular groove (30, 31) possesses the form of figure of revolution relatively to the axis (XX) of the threaded tubular element. 5. Threaded tubular element, according to any of claims 1-4, characterized in that the annular groove (30, 31) decreases under it the stiffness of the wall, comprising threads, made in variable and progressive manner along the axial direction of threaded tubular element. 6. Threaded tubular element, according to claim 5, characterized in that on the level of annular groove a thickness of the wall under the threading is minimal in transversal plane (40, 41), located in the interval between the first engaged thread (21, 22) and sixth engaged thread (28, 29). 7. Threaded tubular element, according to claim 6, characterized in that on the level of annular groove the minimal wall thickness under the threading (emin1, emin2) exceeds and is equal to the height of the thread profile (hf) 8. Threaded tubular element, according to claim 6, characterized in that the minimal wall thickness under the threading (emin1, emin2) is substantially equal to two times