The temper of 7075 aluminum extrusions can be T6, T6510, T6511, T73, T73510, T73511, T76, T76510, T76511.

Temper Description
T6 solution heat treated, artificially aged.
T6510 solution heat treated, stress-relieved by stretching, artificially aged with no hard straightening.
T6511 solution heat treated, stress-relieved by stretching, artificially aged with minor straightening.
T73 solution heat treated, artificially overaged to achieve best stress corrosion resistance.
T73510 solution heat treated, stress-relieved by stretching, artificially overaged to achieve best stress corrosion resistance with no hard straightening.
T73511 solution heat treated, stress-relieved by stretching, artificially overaged to achieve best stress corrosion resistance with minor straightening.
T76 solution heat treated, artificially overaged to achieve good exfoliation resistance.
T76510 solution heat treated, stress-relieved by stretching, artificially overaged to achieve good exfoliation resistance with no hard straightening.
T76511 solution heat treated, stress-relieved by stretching, artificially overaged to achieve good exfoliation resistance with minor straightening.