Patent ID: 8215680

Claim:
A threaded joint comprising a male threaded tube, defined as pin, and a female threaded tube, defined as box, the pin being provided with a first abutment shoulder, the box being provided with a second abutment shoulder, said first and second abutment shoulders having complementary shape, the pin being adapted to be made up in the box, wherein an interference is provided between thread roots of either one of pin or box and thread crests of the other one of pin or box measured according to the nominal dimensions of the pin and box, the value of the interference being comprised between 1% and 5% of the average thickness of the joint, wherein there is provided a root to load flank radius (R) having a value of around ¼ of the thread height, and wherein the joint has a surface treatment comprising shot peening applied to the beginning and end of the threaded zone of the pin.