Threaded tubular element for fatigue resistant threaded tubular joint and resulting threaded tubular joint

Roots of screwed pipe threads including threads, especially hosting thread tooth flank (13), at least on a RADIUS tangent direction connection (21). This district (21) including RADIUS (rP1) is a main arc (23), the main point of support of the arc round in (PRF1) with screw thread tooth flank (13) intersect. (PRF1) tangent and the circle of thread on tooth flank (13) form a strictly positive angle (d). Ratios (rP1) small radius (rS1 and rT1) secondary arc (25,27) end at the side of the main arc tangent direction with minimum thread engagement (13) connection, and the thread roots on the other side (19) connection. RADIUS (rP1) than standard round (29) of the RADIUS (rH1), which circle through points (PRF1), and constitutes a separate connection in the tangent direction. This formation can be a very good resistance to static and threaded fittings threaded pipe connection structure of cyclic stress.