Guide
5052 vs 6061 aluminum for sheet metal: pick the one the part can be formed from
Engineers who machine a lot of 6061 reach for it on sheet metal drawings too, and then the sheet metal shop calls to ask whether the bend radius is real. 6061-T6 is a heat-treated alloy that is strong, machinable and widely stocked as plate and bar, but it cracks on the outside of a tight bend. 5052-H32 is the sheet metal alloy: it forms, it welds, and it is what most enclosure, bracket and panel work is made from.
Send a drawingUpdated October 8, 2026
What each alloy is
5052 is an aluminum-magnesium alloy that gets its strength from cold work, not heat treatment; the H32 temper is the common sheet condition. It has good corrosion resistance, including in marine and wash-down environments, and it bends to a small radius without cracking.
6061 is an aluminum-magnesium-silicon alloy that is heat treated to the T6 temper for strength. It is the general-purpose machining alloy and the common plate alloy. In sheet form it is available, but at T6 it is brittle on a tight bend, and at the softer T4 or O tempers it is less common on the shelf.
Forming: the deciding factor
The rule of thumb sheet metal shops work from is an inside bend radius of about one material thickness for 5052-H32 and about two to three material thicknesses for 6061-T6, with the bend across the grain where the drawing allows. Inside radius equal to material thickness is the usual press brake default; on 6061-T6 that radius cracks the outside of the bend on thicker gauges.
If the part has a sharp inside corner that the design truly needs, 5052 is the alloy. If the part is flat, or bent only on a generous radius, 6061 is fine and may be preferred when the same part has machined features.
Welding and finishing
Both alloys weld, with 5356 or 4043 filler depending on the application. 5052 welds without losing much strength, because it never had heat-treated strength to lose. 6061-T6 loses strength in the heat-affected zone and welded 6061 assemblies are designed around that or re-treated, which few job shops do.
Both anodize. 6061 takes a clear or colored anodize evenly; 5052 can show a slight yellow or brown tint under clear anodize, which matters on cosmetic panels. Both powder coat the same way after a chromate or chem film pretreatment.
5052 vs 6061 at a glance
| 5052-H32 | 6061-T6 | |
|---|---|---|
| Strength source | Cold work | Heat treatment |
| Tight bends | Yes, about 1 T inside radius | No, about 2 to 3 T, cracks tighter |
| Machining | Gummy, fine for holes and cutouts | Excellent |
| Welding | Good, keeps strength | Good, loses strength near the weld |
| Corrosion resistance | Excellent, marine grade | Good |
| Clear anodize | Can tint | Even |
| Typical use | Enclosures, brackets, panels, tanks | Flat plates, machined parts, frames with large radii |
What to put on the drawing
- Alloy and temper together: 5052-H32 or 6061-T6. A drawing that says only "aluminum" gets a question or a shop's default.
- Thickness as a gauge or a decimal with a tolerance band the stock actually comes in; sheet is not plate and 0.125 is a common thickness for both.
- Bend radii on the drawing, or a general note: "inside bend radius = material thickness unless noted" is enough for 5052.
- The finish, and whether grain direction matters for a cosmetic face.
Questions buyers ask
- Can a shop substitute 5052 for 6061 on a sheet metal part?
- Only if you allow it. Shops often propose it when a 6061 drawing has a tight bend, because 5052 will form where 6061 cracks. A substitution is stated on the quote and you decide; the Amerigo quote card shows any material the shop quoted on purpose.
- Is 6061 sheet stronger?
- At T6, yes in tension. For a bracket that is bent, the question is whether it can be formed at all; a cracked 6061 bend is weaker than a sound 5052 one.
- What about 3003 or 5083?
- 3003 is softer and cheaper, used for ductwork and non-structural covers. 5083 is a higher-strength marine alloy and the common cast tool-and-jig plate for machined fixtures. Name the one your application needs; if you are unsure, 5052-H32 is the default for formed sheet.
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