Size Range Outer Diameter: 12.70 mm - 60.30 mm Length: 1.5D to 1 mtr Thickness: 1.24 mm - 5 mm Radius: 1.5D to 1 mtr TEMA CODE (U – Tubes used in Heat Exchangers). ASTM A 556 / SA 556(U – Tubes for use in Tubular Feed Water Heaters) Previous Carbon Steel Cold Finished Seamless Straight Tubes/Pipes Next Stainless Steel Cold Finished Seamless Straight Corrugated Tubes