A519 Standard Specification for Seamless Carbon
1.2 This specification 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. 1.3 The tubes shall be furnished in the following shapes, as specified by the purchaser: round, square ...