ASTM A1065 is a specification for larger tubes typically used for tall columns or members with large loading requirements or long spans. A1065 can also be specified for tapered sections.
A1065 comes in two grades, 50 and 50W, both with a minimum 50 ksi yield strength. Grade 50W is manufactured with enhanced atmospheric corrosion resistance. Due to the stringent wall thickness tolerance inherent to A1065, these sections and their connections may be designed using their full nominal thickness.
Section properties and design tables are available for A1065 in STI Design Guide Volume 1 and 2A.