What is aluminium 6063?
6063 aluminium is a medium-strength alloy widely used for architectural applications due to its excellent surface finish and corrosion resistance. It is most commonly supplied in the 6063T6 temper, which has been solution heat-treated and artificially aged to enhance its mechanical properties. A higher strength variant, 6063A, is also available.
This alloy is typically found in extruded forms such as bars, rods, tubes, and standard profiles. When a standard extrusion—such as a right-angled or square box section—meets the needs of an application, 6063T6 is a popular and efficient choice.
However, if custom dimensions or higher mechanical performance are required, consider alternatives like 6082T6 aluminium or 7075T6 aluminium, which provide greater tensile strength and are more suitable for demanding engineering applications.
Similar or obsolete designations and trade names
6063 is often referred to by its most common temper, T6. Other standard tempers for this alloy include:
Other common designations
- AA6063 / AA6063-T6
- Al Mg0.7Si
- GS10
- AlMgSi0.5
- A-GS
- 3.32206
- ASTM B210
- ASTM B221
- ASTM B241 (Pipe-Seamless)
- ASTM B345 (Pipe-Seamless)
- ASTM B361
- ASTM B429
- ASTM B483
- ASTM B49
- MIL G-18014
- MIL G-18015
- MIL P-25995
- MIL W-85
- QQ A-200/9
- SAE J454
- UNS A96063
- HE19
Main attributes
- Aesthetically pleasing finish
- High corrosion resistance
- Medium strength
- Good surface finish
- Good electrical conductivity
- Easily anodised
- Relatively high tensile properties
Finishing & treatments
Aluminium 6063 can be easily anodised and is suitable for welding.
See our Finishing Processes page for further information on services that we can facilitate.
6063 UK stock sizes
These are representative stock sizes. Please get in touch with your supplier to discuss your requirements further.
Please note that we do not provide raw material, and the below information is for research purposes only.
Flat bar – 6063A T6
| Size | KG/Metre |
| 1/2" X 1/8" | 0.11 |
| 1/2" X 3/16" | 0.16 |
| 7/8" X 1/8" | 0.19 |
| 1" X 1/16" | 0.11 |
| 1" X 1/8" | 0.22 |
| 1" X 3/16" | 0.33 |
| 1½" X 1/8" | 0.33 |
| 2" X 1/8" | 0.44 |
| 3" X 1/8" | 0.65 |
| 4" X 1/8" | 0.87 |
Channel – 6063/6063A T6
| Size | KG/Metre |
| 3/8" X 3/8" X 1/16" X 1/16" | 0.11 |
| 1/2" X 1/2" X 1/16" | 0.15 |
| 1/2" X 1/2" X 1/8" | 0.27 |
| 5/8" X 5/8" X 1/16" | 0.19 |
| 5/8" X 5/8" X 1/8" | 0.35 |
| 3/4" X 3/4" X 1/16" | 0.23 |
| 3/4" X 3/4" X 1/8" | 0.44 |
| 7/8" X 7/8" X 1/8" | 0.52 |
| 1" X 1/2" X 1/8" | 0.38 |
| 1" X 3/4" X 1/8" | 0.49 |
| 1" X 1" X 1/16" | 0.31 |
| 1" X 1" X 1/8" | 0.60 |
| 1¼" X 3/4" X 1/8" | 0.55 |
| 1¼" X 1" X 1/8" | 0.65 |
| 1¼" X 1¼" X 1/8" | 0.76 |
| 1½" X 3/4" X 1/8" | 0.60 |
| 1½" X 1½" X 1/8" | 0.93 |
| 1¾" X 1" X 1/8" | 0.76 |
| 2" X 1" X 1/8" | 0.60 |
| 2" X 3/4" X 1/8" | 0.71 |
| 2" X 1" X 1/8" | 0.82 |
| 2" X 1" X 3/16" | 1.18 |
| 2" X 1¼" X 1/8" | 1.04 |
| 2" X 2" X 1/8" | 1.25 |
| 2½" X 1" X 1/8" | 0.93 |
| 4" X 2" X 1/8" | 1.69 |
Equal angle – 6063A T6
| Size | KG/Metre |
| 1/2" X 1/2" X 1/16" | 0.10 |
| 5/8" X 5/8" X 1/16" | 0.13 |
| 5/8" X 5/8" X 1/8" | 0.25 |
| 3/4" X 3/4" X 1/16" | 0.16 |
| 3/4" X 3/4" X 1/8" | 0.30 |
| 7/8" X 7/8" X 1/8" | 0.35 |
| 25mm X 25mm X 3mm | 0.38 |
| 1" X 1" X 1/16" | 0.21 |
| 1" X 1" X 1/8" | 0.41 |
| 1¼" X 1¼" X 1/16" | 0.27 |
| 1¼" X 1¼" X 1/8" | 0.52 |
| 1½" X 1½" X 1/16" | 0.32 |
| 1½" X 1½" X 1/8" | 0.63 |
| 1¾" X 1¾" X 1/8" | 0.74 |
| 50mm X 50mm X 3mm | 0.79 |
| 2" X 2" X 1/16" | 0.43 |
| 2" X 2" X 1/8" | 0.85 |
| 2" X 2" X 3/16" | 1.24 |
| 2½" X 2½" X 1/8" | 1.06 |
Unequal angle – 6063A T6
| Size | KG/Metre |
| 3/4" X 1/2" X 1/16" | 0.13 |
| 3/4" X 1/2" X 1/8" | 0.25 |
| 1" X 1/2" X 1/16" | 0.16 |
| 1" X 1/2" X 1/8" | 0.30 |
| 1" X 5/8" X 1/8" | 0.33 |
| 1" X 3/4" X 1/16" | 0.18 |
| 1" X 3/4" X 1/8" | 0.35 |
| 1¼" X 1/2" X 1/8" | 0.35 |
| 1¼" X 3/4" X 1/8" | 0.41 |
| 1¼" X 1" X 1/8" | 0.46 |
| 1½" X 3/4" X 1/8" | 0.46 |
| 1½" X 1" X 1/8" | 0.52 |
| 1¾" X 1" X 1/8" | 0.57 |
| 2" X 1/2" X 1/8" | 0.52 |
| 2" X 3/4" X 1/8" | 0.57 |
| 50mm X 25mm X 3.0mm | 0.58 |
| 2" X 1" X 1/8" | 0.63 |
| 2" X 1½" X 1/8" | 0.74 |
| 2½" X 1" X 1/8" | 0.74 |
| 3" X 2" X 1/8" | 1.06 |
| 4" X 1" X 1/8" | 1.06 |
| 4" X 2" X 1/8" | 1.28 |
Tee section – 6063A T6
| Size | KG/Metre |
| 3/4" X 3/4" X 1/8" | 0.30 |
| 1" X 1" X 1/8" | 0.41 |
| 1¼" X 1¼" X 1/8" | 0.52 |
| 1½" X 1½" X 1/8" | 0.63 |
| 2" X 1" X 1/8" | 0.63 |
| 2" X 2" X 1/8" | 0.85 |
Round tube – 6063 T6
| Size | KG/Metre |
| 3/8" O/D X 16SWG | 0.11 |
| 1/2" O/D X 16SWG | 0.12 |
| 1/2" O/D X 18SWG | 0.15 |
| 5/8" O/D X 18SWG | 0.15 |
| 5/8" O/D X 16SWG | 0.20 |
| 3/4" O/D X 18SWG | 0.18 |
| 3/4" O/D X 16SWG | 0.24 |
| 3/4" O/D X 10SWG | 0.44 |
| 7/8" O/D X 18SWG | 0.22 |
| 7/8" O/D X 16SWG | 0.28 |
| 7/8" O/D X 10SWG | 0.52 |
| 1" O/D X 18SWG | 0.25 |
| 1" O/D X 10SWG | 0.61 |
| 1 1/8" O/D X 16SWG | 0.37 |
| 1 1/4" O/D X 18SWG | 0.32 |
| 1 1/4" O/D X 16SWG | 0.40 |
| 1 1/4" O/D X 10SWG | 0.80 |
| 1 3/8" O/D X 16SWG | 0.46 |
| 1 1/2" O/D X 18SWG | 0.38 |
| 1 1/2" O/D X 16SWG | 0.50 |
| 1 1/2" O/D X 10SWG | 0.96 |
| 1 5/8" O/D X 16SWG | 0.50 |
| 2" O/D X 16SWG | 0.70 |
| 2" O/D X 10SWG | 1.30 |
| 2 1/4" O/D X 10SWG | 1.49 |
| 3" O/D X 10SWG | 2.00 |
| 4" O/D X 16SWG | 1.38 |
Box section – Square – 6063 T6
| Size | KG/Metre |
| 1" SQ X 10SWG | 0.78 |
| 1 1/4" SQ X 16SWG | 0.53 |
| 1 1/2" SQ X 10SWG | 1.22 |
| 2" SQ X 10SWG | 1.67 |
| 2" SQ X 1/4" | 3.05 |
| 4" SQ X 10SWG | 3.45 |
| 4" SQ X 1/4" | 6.53 |
Box section – Rectangular – 6063 T6
| Size | KG/Metre |
| 1 1/2" X 3/4" X 1/16" | 0.46 |
| 1 1/2" X 1" X 16SWG | 0.53 |
| 1 1/2" X 1" X 10SWG | 1.00 |
| 50mm X 25mm X 3.0mm | 1.18 |
| 2" X 1" X 10SWG | 1.22 |
| 2" X 1 1/2" X 10SWG | 1.45 |
| 3" X 1" X 10SWG | 1.67 |
| 3" X 1 1/2" X 10SWG | 1.89 |
| 3" X 2" X 10SWG | 2.11 |
| 4" X 1" X 10SWG | 2.11 |
| 4" X 1 3/4" X 10SWG | 2.45 |
| 4" X 2" X 10SWG | 2.56 |
| 6" X 2" X 10SWG | 3.45 |
| 6" X 3" X 3/8" | 10.80 |
Technical properties
6063 T6 physical properties
| Physical Properties | Value |
| Density | 2.70 g/cm3 |
| Melting Point | 655°C |
| Thermal Expansion | 23.5 x10-6 /K |
| Modulus of Elasticity | 69.5 GPa |
| Thermal Conductivity | 201 W/m.K |
| Electrical Resistivity | 0.033 x10-6 Ω·m |
| Electrical Resistivity | 52% IACS |
Mechanical properties: Rod & bar – Up to 150mm dia. & A/F
Spec: To BS EN 755-2: 2008
| Mechanical Properties | Value |
| Proof Stress | 170 Min MPa |
| Tensile Strength | 215 Min MPa |
| Hardness Brinell | 75 HB |
| Elongation A | 10 Min % |
| Elongation A50 mm | 8 Min % |
Rod & bar – 150mm to 200mm dia. & A/F
Spec: To BS EN 755-2: 2008
| Mechanical Properties | Value |
| Proof Stress | 160 Min MPa |
| Tensile Strength | 195 Min MPa |
| Hardness Brinell | 75 HB |
| Elongation A | 10 Min % |
Tube – Up to 25mm wall thickness
Spec: BS EN 755-2
| Mechanical Properties | Value |
| Proof Stress | 170 Min MPa |
| Tensile Strength | 215 Min MPa |
| Hardness Brinell | 75 HB |
| Elongation A | 10 Min % |
| Elongation A50 mm | 8 Min % |
Profiles – Up to 10mm wall thickness
Spec: BS EN 755-2:2008
| Mechanical Properties | Value |
| Proof Stress | 170 Min MPa |
| Tensile Strength | 215 Min MPa |
| Hardness Brinell | 75 HB |
| Elongation A | 8 Min % |
| Elongation A50 mm | 6 Min % |
Profiles – 10mm to 25mm wall thickness
Spec: BS EN 755-2:2008
| Mechanical Properties | Value |
| Proof Stress | 160 Min MPa |
| Tensile Strength | 195 Min MPa |
| Hardness Brinell | 75 HB |
| Elongation A | 8 Min % |
| Elongation A50 mm | 6 Min % |
Typical 6063 chemical composition (weight %)
Spec: BS EN 573-3: 2009
| Weight (%) | Manganese | Iron | Copper | Magnesium | Silicon | Zinc | Chromium | Titanium | Aluminium | Other (Each) | Others (Total) |
| min. | 0.00 | 0.00 | 0.00 | 0.45 | 0.20 | 0.00 | 0.00 | 0.00 | Balance | 0.00 | 0.00 |
| max. | 0.10 | 0.35 | 0.10 | 0.90 | 0.60 | 0.10 | 0.10 | 0.10 | Balance | 0.05 | 0.15 |
Note for designers:
When a standard off the shelf product cannot be used and a more bespoke product is required we advise customers to consider using 6082T6 or for a more high tensile strength product 7075T6 would be advisable.
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