Form This specification covers an aluminum alloy in the form of seamless@ drawn tubing. This specification covers products from 0.025 inches to 0.500 inches (0.64 to 12.70 mm) in wall thickness (See 8.5). Application This tubing has been used typically for parts@ such as brackets@ conduits@ and low-pressure liquid lines@ requiring moderate strength at ambient temperatures@ but usage is not limited to such applications.