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6060, 6063, 6005A or 6082 — choosing the right alloy for your profile
Published 2026-07-22
Most extruded profiles for building and industry are made from a small family of 6000-series alloys — aluminium alloyed with magnesium and silicon. They extrude well, anodize well and weld well, but they are not interchangeable. Choosing between them is a trade-off between strength, surface quality and cost of processing. Here is the practical version.
The four workhorses at a glance
A useful way to think about the family: 6060 and 6063 are the finish-first alloys, 6005A and 6082 are the strength-first alloys.
| Alloy | Character | Typical use |
|---|---|---|
| 6060 | Excellent surface, moderate strength, extrudes complex thin walls easily | Windows, doors, furniture trims, LED channels, decorative profiles |
| 6063 | The architectural standard — very good surface and anodizing response, good strength | Curtain walls, window systems, handrails, general architectural sections |
| 6005A | Noticeably stronger than 6063, still extrudable in complex hollow sections | Solar mounting rails, structural tubes, platforms, transport components |
| 6082 | The strongest of the four, best machining response | Load-bearing structures, machined parts, brackets, marine and transport structures |
When surface finish is the priority
If the profile will be seen — a window frame, a shopfront, a furniture edge — 6063 or 6060 is almost always the right call. Both respond beautifully to anodizing, hold fine detail in the die, and extrude thin walls cleanly. 6060 trades a little strength for even better formability on intricate sections; 6063 remains the default of architectural extrusion worldwide.
When strength is the priority
Structural applications change the calculation. 6082 in T6 temper is the strongest commonly extruded alloy of the family and machines cleanly, which is why it dominates brackets, load-bearing frames and parts that will be milled after extrusion. 6005A sits between worlds: usefully stronger than 6063 while still extruding as complex hollow sections — which is exactly why solar mounting rails and structural tubes are so often made from it.
One caveat worth knowing: the higher-strength alloys are less forgiving cosmetically. If a part is both structural and visible, say so on the enquiry — the choice may come down to finish requirements rather than the load case.
Temper matters as much as alloy
An alloy name without a temper is half a specification. The same 6063 profile behaves very differently as T5 (cooled from the press and artificially aged) versus T6 (solution treated and aged to peak strength). Our standard tempers are T5 and T6; the right one depends on the load case and on the machining planned after extrusion.
Practical rule: put alloy and temper together in every drawing title block — '6063-T5', '6082-T6' — and state the standard you want tolerances held to (EN 12020 for architectural work). That single line prevents most specification disputes.
Not sure? Describe the job, not the alloy
If you are unsure which alloy fits, the most effective enquiry describes the application: what the profile carries, whether it is visible, what finish it gets, what happens to it after extrusion. Matching alloy to application is exactly the kind of feasibility check our engineers run before quoting — it costs nothing and occasionally saves a project from an expensive over- or under-specification.