2024-O vs 2024-T3 - Aircraft engineering - Eng-Tips
20161010 · The T4 designator applies when the product is heat treated by the customer. Typical mechanical properties for 2024 : 2024-0 Ultimate 26,000 psi yield 11,000 psi . 2024 T3 ultimate 65,000 psi yield 45,000psi. 2024 T4 ultimate 64,000 psi yield 42,000psi. So it would appear that if you can use 2024 T3 you may not have to heat treat.