ASTM A519 covers several grades of carbon and alloy steel seamless mechanical tubing. ASTM A519 covers both seamless hot-finished mechanical tubing and seamless cold-finished mechanical tubing in sizes up to and including 12 3/4 in. (323.8 mm) outside diameter for round tubes with wall thicknesses as required. Standard: ASTM A519 / ASME SA519. Steel Grade: 1008, 1010, 1020, 1025, 1026, 4130, 4140.