Tubular threaded joint with trapezoid threads having convex bulged thread surface

摘要: The invention concerns a tubular threaded joint comprising two male and female elements one screwed into the other with specific torque wherein at least thread surface under contact pressure (125) has prior to being continuous convex bulged shape over its bending radius length ranging between 2 60 mm is in point-to-point corresponding (26) of conjugate element. Such exhibits enhanced screwing unscrewing strength. In embodiment, or flank threads comprises groove (31) emerging crest (29) make, as case may be, either flexible. geometry enables accommodate variations flanks.