6061 Aluminum Round Bar Alloy 6061T6/T651/T6511 is stocked, machined and supplied in diameters from 3/4″ (19.05mm) to 8″ (203.2mm). Aluminum 6061 is an extremely versatile, heat treatable aluminum alloy due to its silicon and magnesium content. 6061 aluminum has a wide range of mechanical and corrosion resistance properties while retaining most of aluminum’s good qualities. 6061 aluminum is used in many applications ranging from aircraft structures, yacht structures, truck bodies, bicycle frames to screw machine parts. You can learn more about Aluminum 6061 here.