6063-T5 aluminum is a heat-treated extrusion alloy known for its moderate strength, excellent surface finish, and outstanding corrosion resistance. It is widely used in architectural applications such as window frames, doors, and curtain walls due to its superior anodizing performance and formability.
What Is 6063-T5 Aluminum?
6063-T5 aluminum is an Al-Mg-Si (Aluminum-Magnesium-Silicon) alloy that has been air-cooled from an elevated temperature shaping process (extrusion) and then artificially aged.
The "6063" designation refers to its specific chemical recipe within the 6000 series family. The "T5" temper indicates the exact thermal treatment it received at the factory. After the hot aluminum is pushed through the extrusion die, it is rapidly cooled using industrial air fans. Once cooled to room temperature, the profiles are placed in an aging oven at around 175°C to 185°C for several hours. This artificial aging process stabilizes the metal lattice and significantly improves its mechanical properties and surface quality compared to its raw, unaged state.
Chemical Composition of 6063 Aluminum Profiles
The properties of 6063 aluminum are directly dictated by its chemical makeup. It contains lower amounts of alloying elements compared to high-strength aerospace alloys, which is exactly what gives it its incredible extrusion capabilities.
| Element | Content (%) | Industrial Function |
| Silicon (Si) | 0.20 – 0.60 | Lowers the melting point, improving metal flow during extrusion. |
| Magnesium (Mg) | 0.45 – 0.90 | Combines with Silicon to form Magnesium Silicide (Mg2Si), increasing strength. |
| Iron (Fe) | ≤ 0.35 | Controlled strictly to prevent surface defects during anodizing. |
| Copper (Cu) | ≤ 0.10 | Kept very low to maximize corrosion resistance. |
| Aluminum (Al) | Balance | The primary base metal. |
The balanced Mg and Si content provides good strength and excellent extrudability, making it the most popular alloy for complex profile shapes.
Mechanical Properties of 6063-T5 Aluminum Extrusions
For structural engineers and designers, the mechanical properties determine whether the material can safely handle the required loads without deforming or breaking.
| Mechanical Property | Typical Value (Metric) | Typical Value (Imperial) |
| Tensile Strength (Ultimate) | 145 – 186 MPa | 21,000 – 27,000 psi |
| Yield Strength | 110 – 145 MPa | 16,000 – 21,000 psi |
| Elongation at Break | 8 – 12% | 8 – 12% |
| Hardness (Brinell) | ~60 HB | ~60 HB |
| Shear Strength | ~117 MPa | ~17,000 psi |
Summary: 6063-T5 offers moderate strength with excellent formability. The yield strength of 110–145 MPa means it can easily handle the wind loads and structural requirements of building facades, while its 8-12% elongation allows it to be bent or formed slightly without fracturing.
Physical Properties of 6063-T5 Architectural Aluminum
Beyond strength, the physical properties of 6063-T5 make it highly versatile for thermal and electrical applications.
| Physical Property | Typical Value |
| Density | 2.70 g/cm³ (0.0975 lb/in³) |
| Thermal Conductivity | ~200 W/m·K |
| Electrical Conductivity | ~52% IACS |
| Melting Point | ~615°C (1140°F) |
| Modulus of Elasticity | ~69 GPa (10,000 ksi) |
Its high thermal conductivity (200 W/m·K) is the exact reason why 6063 is the globally preferred alloy for manufacturing extruded heat sinks for electronics and LED lighting.
Key Advantages of 6063-T5 Aluminum
Why is 6063-T5 the most widely consumed extrusion alloy in the world? Because it offers an unmatched combination of commercial benefits:
- Excellent surface finish: It extrudes cleanly, producing a smooth surface virtually free of die lines.
- Outstanding anodizing performance: Its low copper and iron content allows for highly uniform, aesthetically pleasing anodic coatings (clear, black, bronze, or gold) without dull spots.
- Good corrosion resistance: It naturally forms a protective oxide layer, making it highly durable in outdoor atmospheric environments.
- Easy extrusion into complex shapes: The soft nature of the metal at extrusion temperatures allows die makers to design incredibly intricate hollow shapes with thin walls.
- Lightweight: At one-third the weight of steel, it reduces transportation and installation costs.
6063-T5 is known universally as the "architectural aluminum alloy" due to its superior surface quality and weathering capabilities.
Limitations of 6063-T5 Aluminum Profiles
To ensure engineering safety, it is vital to understand what 6063-T5 cannot do.
Lower strength than 6061-T6: With a yield strength of ~145 MPa, it is significantly weaker than 6061-T6 (~240 MPa) and cannot be used for primary load-bearing structures.
Not suitable for heavy structural loads: You should never use 6063-T5 for crane booms, truck chassis, heavy machinery bases, or bridge decking.
Machinability: While easy to cut with standard carbide saws, it can be slightly "gummy" during high-speed CNC milling, producing long, stringy chips compared to the clean-breaking chips of stronger alloys.
It is not recommended for high-load structural applications.
Are you unsure if the 145 MPa yield strength of 6063-T5 is sufficient to handle the wind loads or weight requirements of your specific design? Send your CAD drawings to our engineering team today for a free structural evaluation and material recommendation.
Common Applications of 6063-T5 Aluminum Extrusion
Because of its specific mechanical and physical properties, 6063-T5 dominates three main industrial sectors:
1. Architectural (Primary Market)
Window frames and sliding door systems
Curtain walls and glass facade mullions
Aluminum facades, roofing, and architectural louvers
Handrails and balustrades
2. Industrial
Heat sinks for inverters and computers
Pneumatic cylinders and fluid tubing
Light structural profiles (T-slot framing systems)
3. Decorative & Consumer Goods
Furniture frames (indoor and outdoor)
Shower enclosures and edge trims
Anodized retail display shelving
6063-T5 vs Other Tempers: T5, T6, and T52
The 6063 alloy can be heat-treated to different tempers to alter its final properties.
| Temper | Processing Difference | Result |
| T5 | Standard extrusion air cooling + artificial aging | Medium strength, best balance of cost and formability. |
| T6 | Water quenching + artificial aging | Higher strength, but more brittle and prone to warping during extrusion. |
| T52 | Cooled, artificially aged + stress-relieved by compression | Relieves internal residual stress, preventing warping during CNC machining. |
T5 is the most commonly used temper for extrusion profiles, accounting for the vast majority of commercial applications.
6063-T5 vs 6061-T6 Aluminum
Buyers often confuse these two 6000-series alloys. Here is a quick reference guide:
| Feature | 6063-T5 Aluminum | 6061-T6 Aluminum |
| Strength | Medium (~145 MPa Yield) | High (~240 MPa Yield) |
| Surface Finish | Excellent (Smooth, flawless) | Good (Functional, but rougher) |
| Extrudability | Excellent (Complex hollows) | Fair (Simple shapes only) |
| Application | Architectural & Decorative | Structural & Machinery |
Why Choose 6063-T5 Aluminum for Your Project?
Use this simple decision-making logic:
- If Appearance is the priority → Choose 6063-T5.
- If you need to extrude complex, thin-walled structures → Choose 6063-T5.
- If your project has strict Anodizing demands → Choose 6063-T5.
- If load-bearing strength is the priority → Switch to 6061-T6.
6063-T5 is the best choice for applications requiring appearance, corrosion resistance, and excellent extrusion quality.
GNEE Aluminum Supply Advantages: Accepting Multi-Size Specification Orders
Sourcing architectural aluminum is notoriously difficult because a single building project often requires a massive variety of profile shapes. Most large extrusion mills demand high Minimum Order Quantities (MOQs) for each individual shape, forcing buyers to deal with multiple distributors at inflated prices.
Our Core Advantage: Accepting Multi-Size and Mixed Orders
GNEE, a leading Chinese aluminum supplier, specializes in solving this exact procurement problem. We proudly accept multi-size, mixed-specification orders. Whether your Bill of Materials includes heavy curtain wall mullions, delicate window trims, and custom heat sinks, we will manufacture all the different dies, extrude the various shapes, and consolidate your entire project into a single, cost-effective container shipment.
Real Factory Capabilities & Quality Assurance:
- Production Equipment: Our facility is equipped with a full range of extrusion presses from 800 tons to 4000 tons, capable of producing profiles with a circumscribed circle diameter of up to 350mm. We supply 6063 aluminum in T5, T6, and T52 tempers.
- Surface Treatment: We operate automated vertical anodizing lines that deliver a flawless, AAMA-compliant finish.
- Real Case Study: In 2024, a commercial contractor in Melbourne, Australia, required materials for a modern office facade. They needed 18 different custom 6063-T5 profile shapes, all requiring a specific 20-micron clear anodized finish to withstand coastal air. GNEE successfully extruded the entire mixed-size order, applied the precise surface treatment, and shipped it on time, saving the client significant logistics overhead.
- Export Packaging: We use EPE foam to interleave every profile, preventing surface scratches. The bundles are shrink-wrapped, covered in moisture-proof kraft paper, and secured to ISPM-15 compliant, fumigation-free wooden pallets for safe global delivery.
Stop managing multiple suppliers and fighting high MOQs for your complex architectural or industrial projects. Send your complete list of 6063-T5 profile shapes and CAD drawings to GNEE today. We will provide a consolidated, factory-direct quotation within 24 hours.