Aluminium 6061 vs Aluminium 6063
6061 and 6063 are both heat-treatable Al-Mg-Si alloys but designed for different purposes. 6061 has higher strength and is the structural workhorse. 6063 has lower strength but excellent surface finish and extrudability — the standard for architectural sections like window frames.
Side-by-side comparison
| Attribute | Aluminium 6061 | Aluminium 6063 |
|---|---|---|
| Magnesium | 0.8–1.2% | 0.45–0.9% |
| Silicon | 0.4–0.8% | 0.2–0.6% |
| Tensile strength (T6) | ≥ 290 MPa | ≥ 215 MPa |
| Yield strength (T6) | ≥ 240 MPa | ≥ 170 MPa |
| Surface finish | Good | Excellent (anodises beautifully) |
| Extrudability | Moderate | Excellent |
| Weldability | Excellent | Excellent |
| Common uses | Aerospace, structural, marine, machined parts | Window frames, doors, railings, decorative trim |
When to choose Aluminium 6061
Use 6061 when mechanical strength matters — structural members, marine fittings, aerospace, machined components, bicycle frames.
Buy Aluminium 6061 on MetaleMartWhen to choose Aluminium 6063
Use 6063 when surface finish and complex extrusion profiles matter more than maximum strength — window/door frames, railings, signage, decorative architecture.
Buy Aluminium 6063 on MetaleMartFrequently asked questions
Which is more common in India?
6063 is more common because of its dominance in window frames and architectural sections. 6061 is widely available for engineering use.
Can I anodise both?
Yes, but 6063 anodises with a smoother, more uniform finish — that is why architects prefer it.
Which is more expensive?
Prices are usually similar; 6061 is sometimes 5–10% higher due to demand from engineering applications.