Abstract: A unitary axle of an elongated tubular construction preferably made from heat treated steel so as to be light weight with high strength. Two embodiments of the axle each have a first vehicle mounted end and a second wheel supporting end as well as an intermediate portion having an I-beam section whose combined height and width is less than the combined height and width of the intermediate axle portion adjacent the second axle end. Upper, lower, and spaced side walls of the intermediate axle portion have a uniform thickness and the side walls are deformed inwardly to form the I-beam section preferably so as to have inner sides thereof engaged with each other. First and second bends in the axle adjacent the first and second ends thereof allow it to be used in an overlapping relationship with another bent axle. A rectangular section of the intermediate axle portion is located between the I-beam section and the second axle end.