Aluminum tubing sizes chart 05 x 38. Need a size of carbon steel tubing not on the ANSI Pipe Chart? We can help. We carry aluminum rectangle tubing in 6060, 6061, and 6063. , and 24ft. 420 3 1404 17. 13 0. 06 Conversion Charts, Weights & Dimensions pipe sizes (weights and thicknesses, etc. Wall I. Structural Tubing: 2" and over 11 ga wall thickness - ASTM A-500 Grade B. The 6061 round tubing offers corrosion resistance, weldability, and good strength while the 3003 round tubing is often used for marine fittings, framing, and structural components.