Abstract: A threaded flush joint for tubular members, particularly a well casing string joint which includes a pin member and a box member, the pin member having an external torque shoulder and being swaged inwardly on its end from the torque shoulder to its end and having external hook threads on its swaged portion, the box member having internal shoulder and internal hook threads which mate with the external hook threads of said pin member. The load flank of the threads of the joint is provided on a flank having a reverse angle taper of approximately 7.degree..

Abstract: An apparatus for straightening pipe, round bars or similar elements, wherein the pipe moves between rolls which subjects the pipe to tensile and compressive stresses and forces as it rotates in the straightener apparatus, with the movement of the pipe being effected by rotation of the rolls. Certain of the rolls are vertically adjustable with respect to the pipe and others are horizontally adjustable with respect to the pipe and to each other while certain other rolls are adjustable both vertically and horizontally with respect to the pipe and to each other while the pipe is moving through the apparatus and the straightening operation is in progress, whereby the forces being applied to the pipe may be readily changed in accordance with the bends or other deformity in the pipe to assure that the required forces are applied to the proper pipe areas to accomplish effective straightening of the pipe.