SAE AMS4071P PDF
This specification covers an aluminum alloy in the form of drawn, round seamless tubing having a wall thickness of 0.010 to 0.450 inch (0.25 to 11.43 mm), inclusive, and nominal outside diameters of 0.125 to 3.000 inch (3.18 to 76.2 mm), inclusive (see 8.5).