6063-T5 Aluminum properties
6063 is an aluminum-magnesium-silicon alloy known for its excellent extrudability and smooth surface finish. It is the standard architectural extrusion alloy, used for window frames, railings, and trim. Values below are for the T5 temper.
Mechanical properties
| Property | Value |
|---|---|
| Yield strength | 21 ksi (145 MPa) |
| Ultimate tensile strength | 27 ksi (186 MPa) |
| Elongation | 12% |
| Hardness | 60 HB (Brinell) |
| Modulus of elasticity | 10,000 ksi (69 GPa) |
Physical properties
| Property | Value |
|---|---|
| Density | 0.097 lb/in³ (2700 kg/m³) |
| Melting point | about 615 to 655 °C |
Thermal properties
| Property | Value |
|---|---|
| Thermal conductivity | 209 W/m·K |
| Thermal expansion | 23.4 µm/m·°C |
| Specific heat | 900 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
6063-T5 is used for window and door frames, railings, trim, tubing, and decorative extrusions. It extrudes into complex thin-walled shapes with a fine finish that anodizes beautifully, which is why it dominates architectural and consumer extrusion.
How it compares
6063 extrudes more easily and finishes better than 6061, at the cost of strength: it is notably weaker. Where appearance and intricate cross-sections matter more than load, 6063 is preferred; where strength is needed, 6061 is the better structural choice.
FAQ
What is 6063 aluminum used for?
Architectural extrusions: window frames, railings, trim, and tubing, where a smooth, anodizable finish and complex shapes matter.
What is the difference between 6061 and 6063?
6063 extrudes more easily and finishes better but is weaker; 6061 is stronger and better for structural and machined parts.
Does 6063 anodize well?
Yes. It produces a clean, even anodized finish, which is a key reason it is favored for visible architectural parts.