The characteristics, differences and applications of 6063T5 and 6063T6 aluminum alloys in aluminum doors and windows
In the aluminum door and window industry, 6063 series aluminum alloy is one of the most widely used extrusion materials. Within this series, the temper states 6063T5 and 6063T6 are the two most common options. For engineers, contractors, and overseas buyers, understanding the characteristics, differences, and applications of these two tempers is essential when specifying frames for projects.
As a professional manufacturer, Rutao provides custom aluminum profiles and finished systems based on both 6063T5 and 6063T6 alloys to meet the varied needs of global customers.
1. Characteristics of 6063 aluminum alloy
6063 is a magnesium-silicon (Al-Mg-Si) series alloy. Its typical composition gives it:
Good corrosion resistance – suitable for outdoor building applications.
Excellent extrudability – complex hollow profiles can be produced with consistent accuracy.
Attractive surface finish – anodizing and powder coating both achieve stable, uniform results.
Balanced mechanical properties – moderate strength combined with good toughness.
These qualities make 6063 aluminum a preferred choice for door and window frames, curtain walls, railings, and architectural profiles.
2. What does T5 and T6 temper mean?
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The “T” numbers describe heat treatment and cooling processes after extrusion:
T5: Cooled from the extrusion temperature and then artificially aged.
T6: Solution heat-treated, quenched, and then artificially aged.
The key difference is that T6 undergoes solution heat treatment, resulting in higher strength than T5.
3. Key differences between 6063T5 and 6063T6
| Property | 6063T5 | 6063T6 |
|---|---|---|
| Process | Cooled after extrusion + artificial aging | Solution heat treatment + quenching + artificial aging |
| Tensile strength | ~160–190 MPa | ~240–270 MPa |
| Yield strength | ~110–150 MPa | ~200–240 MPa |
| Hardness | Moderate | Higher |
| Extrudability | Easier, lower production stress | Slightly more difficult |
| Surface finish | Smooth, uniform | Smooth, uniform |
| Price | Generally lower | Slightly higher |
In short: 6063T5 = easier extrusion, good surface quality, moderate strength. 6063T6 = stronger, better load resistance, but harder to process.
4. Applications in aluminum doors and windows
6063T5 aluminum alloy
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Used for standard window and door frames where moderate strength is sufficient.
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Preferred in projects prioritizing surface finish and cost-effectiveness.
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Ideal for residential doors and windows, sliding doors, and decorative profiles.
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6063T6 aluminum alloy
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Applied in structural door and window systems requiring higher strength.
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Suitable for large-span sliding doors, heavy-duty curtain wall frames, and commercial projects.
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Recommended for areas with high wind load or stricter performance requirements.
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5. How to choose between 6063T5 and 6063T6?
For regular residential use → 6063T5 is economical, with reliable performance and beautiful finishing.
For commercial or high-rise projects → 6063T6 offers extra strength and safety margin.
For export projects → always confirm with local building codes (e.g., wind pressure resistance, safety standards).
6. Rutao’s advantage in supplying 6063T5 and 6063T6
At Rutao, we manufacture and export a wide range of aluminum door and window systems based on both T5 and T6 tempers:
Customized extrusion profiles with precise tolerances.
Surface treatments including anodizing, powder coating (AAMA 2604/2605), and wood grain finishes.
Thermal break solutions for enhanced energy performance.
One-stop service: from profile extrusion → fabrication → glazing → finished door and window export packaging.
By partnering with Rutao, overseas buyers gain access to reliable supply chains, competitive pricing, and professional technical support.
Conclusion
Both 6063T5 and 6063T6 aluminum alloys are widely used in the fabrication of doors and windows. While T5 emphasizes extrusion efficiency and smooth finishing, T6 offers greater strength and durability. Choosing the right temper depends on the application scenario, performance requirements, and budget.
With extensive experience in aluminum solutions, Rutao provides tailored systems and profiles to help contractors, distributors, and developers worldwide deliver projects that combine strength, beauty, and cost efficiency.
