An axial swaged fitting for permanently joining to a tube to achieve an elastic strain preload condition comprises an annular body including at least one body compression ball cavity. The body laterally surrounds at least a portion of the tube. An annular retainer includes at least one retainer compression ball cavity. The retainer laterally surrounds at least a portion of the body. A compression ball is located concurrently in both of the body compression ball cavity and the retainer compression ball cavity. The compression ball is deformed into both the body and the retainer. An annular collar laterally surrounds at least a portion of the retainer. The collar selectively exerts a predetermined compression force laterally inward toward the tube to urge the at least one compression ball into a deformation contact with at least one of the body compression ball cavity and the retainer compression ball cavity into the elastic strain preload condition.