| Temper Designations for Aluminum | |
| -F | As cast condition |
| -O | Annealed temper of wrought materials |
| -H14 | Cold worked to tensile strength midway between termpers O and H18 |
| -H18 | Cold worked to full hard temper |
| -H34 | Cold worked beyond temper range and stabilized |
| -H38 | Same as H34 but with higher strength properties |
| -T3 | Solution heat treated followed by strain hardening |
| -T4 | Solution heat treated followed by natural aging at room temperature |
| -T6 | Solution heat treated followed by artificial aging |
| -T8 | Solution heat treated, strain hardened, and artificial aging |