Patent ID: 7845687

Claim:
A threaded tubular connection, comprising: a male tubular element including a tapered male threading, and a female tubular element including a tapered female threading that cooperates with the male threading by makeup to produce a rigid mutual connection of the male and female tubular elements with radial interference between radial load transfer zones of the male and female threadings, wherein the male and female threadings each have a load flank extending substantially perpendicularly to an axis of the male and female threadings, and wherein the radial load transfer zones are at a radial distance from envelopes of thread roots of the male and female threadings and form an angle of less than 40° with the axis of the male and female threadings, wherein the radial load transfer zones are ramps constituting stabbing flanks of the male and female threadings over a major portion of a radial height thereof, wherein a profile of the male threading includes a first concave rounded portion defining the thread root and tangential to the ramp, and wherein the profile of the male threading includes a second concave rounded portion with a smaller radius of curvature than the first rounded portion and tangential thereto and to the load flank.