Square aluminum tubing Same and Next Day Delivery. 201 Quote 15034 – SEE ALUMINUM SQUARE TUBE 6061-T6. , and 24ft. 03 0. Free Store Pickup Today. Oklahoma 918. We combine high quality aluminum materials with state-of-the-art machining techniques to manufacture our heavy duty square aluminum tubing products. 6061 is the least expensive and most versatile of the heat-treatable aluminum alloys. It is an extruded tube with square corners inside and outside, with no welded seam. Aluminum material is lightweight and adds a bright and clean appearance to any project. ucrtnpgktyrktcgigwvmwxcqwpmbszdsqcwxyulcsvzresyhseyhhphtmrwuhrizynyehpfmehhlmb