6061 T6511 aerospace grade aluminum 6061 T6511 aluminum is sometimes considered for aerospace-related components because of its useful strength-to-weight ratio, corrosion resistance, machinability, and availability. However, the term “aerospace grade aluminum” should be used carefully. A material should not be considered aerospace-approved simply because it is a recognized aluminum alloy. Aerospace applications normally require compliance with specific material specifications, traceability requirements, testing procedures, and customer or regulatory standards. Therefore, engineers must verify that the particular 6061 T6511 product meets the specification required for the intended aerospace application.