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Aluminum

6063-T5

6063-T5 is the architectural extrusion aluminum: a Mg-Si (6000-series) alloy with lower strength than 6061 but superior extrudability and surface finish. At roughly 145 MPa yield it trades load capacity for the ability to form thin, intricate, smooth profiles, making it the standard for window frames, railings, and decorative extrusions.

How 6063-T5 machines

Machines well (rated 4.0/5), close to 6061 but slightly softer. It cuts cleanly with sharp carbide and leaves smooth surfaces, though the softer temper can make chips a touch more stringy. In practice it is extruded to near-net shape, so machining is usually secondary cutting, drilling, and trimming of profiles.

Manufacturing & processing

Purpose-built for extrusion, where it fills complex thin-wall dies cleanly and takes an excellent finish. It welds well by TIG/MIG and anodizes beautifully, taking bright and colored anodize prized in architecture. Secondary CNC operations are common on extruded sections. The T5 temper is achieved by cooling from extrusion plus artificial aging.

Typical applications

Dominant in architectural and complex-profile extrusions: window and door frames, curtain-wall mullions, railings, handrails, furniture frames, LED heat-sink and lighting profiles, T-slot framing, and decorative trim. It is chosen wherever a smooth, anodizable extruded shape matters more than high mechanical strength.

When to choose it

Choose 6063-T5 when you need a clean, anodizable, intricate extruded profile and strength is secondary, as in architecture and trim. Pick 6061-T6 when the extrusion or part must carry real structural load, or 6082/6005A for structural extrusions. Use 5052 instead when the part is formed sheet rather than an extrusion.

Suitable surface finishes

Common finishes for 6063-T5: Type II anodizing, chromate/Alodine, powder coating, bead blasting. Use the finish selector →

FAQ

What is the difference between 6063 and 6061?
Both are Mg-Si 6000-series alloys, but 6063 is optimized for extrudability and surface finish at lower strength (around 145 MPa yield), while 6061-T6 is stronger (around 276 MPa) for structural use. Choose 6063 for fine architectural profiles and anodized appearance, and 6061 for load-bearing parts.
Does 6063 anodize well?
Yes, exceptionally. 6063 is one of the best aluminums for anodizing, producing bright, uniform, attractive finishes, which is a major reason it dominates architectural extrusions. It accepts clear and colored anodize cleanly, making it ideal for visible window frames, railings, and decorative profiles.
Is 6063 strong enough for structural use?
Only for light loads. At about 145 MPa yield it is considerably weaker than 6061-T6 and is intended for non-critical or lightly loaded profiles. For structural extrusions and frames carrying real load, use 6061-T6, 6082-T6, or 6005A-T6, which offer much higher strength.

Property values are typical/nominal for early guidance and vary by temper, grade, supplier and heat treatment. Confirm critical specs against a certified datasheet or with an mfgiq engineer.