7075-T6 Aluminum properties
7075 is a high-strength aluminum-zinc alloy, among the strongest aluminum alloys available, approaching the strength of some steels at a third of the weight. It is used for highly stressed aerospace and defense parts. Values are for the T6 temper.
Mechanical properties
| Property | Value |
|---|---|
| Yield strength | 73 ksi (503 MPa) |
| Ultimate tensile strength | 83 ksi (572 MPa) |
| Elongation | 11% |
| Hardness | 150 HB (Brinell) |
| Modulus of elasticity | 10,400 ksi (72 GPa) |
Physical properties
| Property | Value |
|---|---|
| Density | 0.102 lb/in³ (2810 kg/m³) |
| Melting point | about 475 to 635 °C |
Thermal properties
| Property | Value |
|---|---|
| Thermal conductivity | 130 W/m·K |
| Thermal expansion | 23.4 µm/m·°C |
| Specific heat | 960 J/kg·K |
Values are typical for the grade and condition shown. Actual properties vary with temper, heat treatment, and product form, so use these for comparison and preliminary design and confirm against material certificates for final work.
Compare with other materials
See the Material Properties Comparison, Yield Strength, and Density charts.
Typical uses
7075-T6 is used for aircraft structures, wing spars, defense hardware, high-stress fittings, and competition parts. Its very high strength-to-weight ratio suits the most demanding lightweight structural applications, where it is machined rather than welded.
How it compares
7075 is the strongest of the common aluminum alloys, exceeding 2024 and far above structural 6061. The trade-off is poor weldability and lower corrosion resistance, so it is used as machined or fastened high-strength parts rather than for general fabrication.
FAQ
How strong is 7075-T6 aluminum?
About 73 ksi yield and 83 ksi tensile, the highest of common aluminum alloys, approaching mild steel strength at roughly a third of the weight.
Can 7075 be welded?
Not readily by fusion welding; its zinc content makes it crack-prone, so it is usually machined and fastened instead.
What is 7075 used for?
Highly stressed aerospace and defense parts, wing spars, and competition components where maximum strength-to-weight is essential.