Torsion resistant grooved joint

A torque tube employing end members interconnected by a tubular member. The end members are provided with a male extension. having radially spaced, axially extending grooves, the number of grooves, outer diameter of the end member, groove width and groove length being in prescribed proportions and ratios. The ends of the tubular member are positioned over the male end member extensions and the tube walls are conformed to the end member· and grooves electromagnetically so that the tube walls are recessed into the grooves.