Form 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). Application This tubing has been used typically for parts@ such as hydraulic systems and fuel and oil lines@ but usage is not limited to such applications.