Popular for its light weight, good strength, and corrosion resistance, aluminum square tube is used in structural applications. We carry aluminum square tubing for sale in 6060 | 6061 and 6063. Our available aluminum square tubing sizes are 1ft, 2ft, 3ft, 4ft, 5ft, 6ft, 7ft, 8ft, 20ft., and 24ft. You can also order custom-cut lengths.