The deformation of round tube into an elliptical shape; symmetrical flattening of a round tube; a measure of the difference between the maximum and minimum outside diameters of a round tube. Ovality is not a form of bend reduction, which is flattening of a tube’s outside radius as result of the bending process. In contrast, ovality is a deviation of a tube from an ideal round shape caused by imperfection during milling or flattening from storage.