Patent ID: 7823931

Claim:
A tubular threaded joint comprising a pin which is a male threaded element formed on an end portion of a first tubular member and a box which is a female threaded element formed on an end portion of a second tubular member, the pin and the box each having a threaded zone and at least one torque shoulder surface, the male threaded zone of the pin engaging with the female threaded zone of the box, the at least one torque shoulder surface of the pin abutting against the at least one torque shoulder surface of the box in the axial direction of the pipe, one of the abutting torque shoulder surfaces being an end shoulder surface constituting an end surface in the transverse direction of the member, the threads of the male threaded zone and the female threaded zone being generally trapezoidal threads which have a thread crest, a load flank, and a stabbing flank and which have a root separating the thread, characterized in that the lip length of the member having an end shoulder surface, which is the axial distance between the end shoulder surface and the load flank of the closest engaged thread to the end shoulder surface, is at least 140 times the stabbing flank clearance, which is the axial distance of the clearance between the stabbing flanks of the male thread and the female thread when the load flank of the male threads and that of the female thread contact each other in the engaged threads of the pin and box, wherein the thread of at least one of the pin and box has a stabbing flank which comprises a first portion on the root side and a second portion on the thread crest side, the second portion has a larger average angle of slope with respect to a line perpendicular to the longitudinal axis of the joint than the first portion, and the first portion is parallel to the stabbing flank of the other of the pin and the box.