6061-T6 Aluminum properties
6061 is the most widely used structural aluminum alloy, offering a good balance of strength, corrosion resistance, weldability, and machinability. In the T6 temper it is heat-treated to peak strength. It is the default aluminum for general engineering.
Mechanical properties
| Property | Value |
|---|---|
| Yield strength | 40 ksi (276 MPa) |
| Ultimate tensile strength | 45 ksi (310 MPa) |
| Elongation | 12% |
| Hardness | 95 HB (Brinell) |
| Modulus of elasticity | 10,000 ksi (69 GPa) |
Physical properties
| Property | Value |
|---|---|
| Density | 0.098 lb/in³ (2700 kg/m³) |
| Melting point | about 580 to 650 °C |
Thermal properties
| Property | Value |
|---|---|
| Thermal conductivity | 167 W/m·K |
| Thermal expansion | 23.6 µm/m·°C |
| Specific heat | 896 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
6061-T6 is used for structural framing, machined parts, bike and vehicle frames, tooling, brackets, and extrusions. Its all-round properties, weldability, and machinability make it the default aluminum for general fabrication and engineering.
How it compares
6061 balances strength, weldability, corrosion resistance, and cost better than any other aluminum alloy, which is why it is so common. It is stronger than 5052 and 6063, weaker than aerospace 2024 and 7075, but far easier to weld and machine than those.
FAQ
What is 6061-T6 aluminum used for?
General structural and machined parts: frames, brackets, tooling, and extrusions. It is the default aluminum for most engineering work.
Is 6061 aluminum weldable?
Yes, it welds well, though welding softens the heat-affected zone and the T6 strength is reduced locally unless re-heat-treated.
How strong is 6061-T6?
About 40 ksi yield and 45 ksi tensile, strong enough for most structural use while remaining easy to machine and weld.