6005A-T6 vs 6061-T6
6005A-T6 and 6061-T6 are both heat-treatable 6xxx aluminum alloys, but they serve different jobs. 6005A is an extrusion-optimized alloy tuned for thin-wall structural profiles, reaching ~270 MPa tensile / 225 MPa yield. 6061 is the all-round workhorse — stronger at ~310 MPa tensile / 276 MPa yield and available as plate, sheet, bar, and extrusion. The trade is extrudability and thin-wall quality versus general-purpose strength and availability.
The verdict
Choose 6005A-T6 for complex thin-wall extruded profiles — solar frames, rail, and structural sections where extrudability and surface quality matter. Choose 6061-T6 for general machined parts, plate, and any part needing higher strength (~276 MPa yield vs 225 MPa) or broad product-form availability.
Side-by-side data
| Property | 6005A-T6 | 6061-T6 |
|---|---|---|
| Category | Aluminum | Aluminum |
| Density (g/cm³) | 2.7 | 2.7 |
| Tensile strength (MPa) | 270 | 310 |
| Yield strength (MPa) | 225 | 276 |
| Elongation (%) | 8 | 12 |
| Hardness | 90 HB | 95 HB |
| Max service temp (°C) | 150 | 170 |
| Machinability | ●●●●● | ●●●●● |
| Corrosion resistance | ●●●●● | ●●●●● |
| Relative cost | ●●●●● | ●●●●● |
| Thermal cond. (W/m·K) | 180 | 167 |
| Typically used for | Thin-wall structural profiles | All-round structural & machined parts — the default aluminum |
Which should you choose?
Choose 6005A-T6 when…
- Extruding thin-wall structural profiles like solar mounting and rail sections
- Complex hollow or intricate die shapes that extrude better than 6061
- Good strength-to-extrudability balance is the priority (~225 MPa yield)
- High thermal conductivity helps (180 W/m·K vs 6061's 167)
- Long structural profiles need consistent thin walls and good surface finish
- Replacing 6061 extrusions to improve extrusion speed and press yield
Choose 6061-T6 when…
- Machining general structural and functional parts (the default aluminum)
- You need plate, sheet, bar, or extrusion — broad form availability
- Higher strength is required: ~276 MPa yield vs 6005A's ~225 MPa
- Better machinability matters (4.5 vs 4.0 index)
- Designing welded structures with well-documented 6061 weld data
- Standard, lowest-risk spec where 6061 is the recognized baseline
Key differences that matter
- Strength: 6061-T6 ~310 MPa tensile / 276 MPa yield vs 6005A-T6 ~270 MPa tensile / 225 MPa yield — 6061 is ~23% higher yield
- 6005A is purpose-built for extrusion: it runs faster on the press and holds thinner walls and finer detail than 6061
- Both are heat-treatable (T6 = solution + artificial aging) and weldable, losing some strength in the heat-affected zone
- 6061 is far more available in plate, sheet, and bar; 6005A is predominantly an extrusion alloy (lists Extrusion, CNC)
- Thermal conductivity: 6005A 180 W/m·K vs 6061 167 W/m·K — a slight edge for heat-sink-style profiles
- Corrosion resistance is comparable (both ~3.5/5), good but below the 5xxx marine alloys
- Machinability favors 6061 (4.5 vs 4.0), making it the better pick for heavily machined parts
Need 6005A-T6 or 6061-T6 parts made?
Use our free tools to finalize your spec, then get a quote from a vetted factory.
Open the Material SelectorGet a Quote →Frequently asked questions
What is the difference between 6005A and 6061 aluminum?
Both are heat-treatable 6xxx alloys, but 6005A is optimized for extrusion — it extrudes faster and holds thinner walls and complex die shapes. 6061 is the general-purpose workhorse, stronger (~276 vs ~225 MPa yield) and available in plate, sheet, and bar. Choose 6005A for thin-wall profiles, 6061 for machined parts and broad availability.
Is 6005A stronger than 6061?
No. In T6 temper, 6061 is stronger, with about 310 MPa tensile and 276 MPa yield versus roughly 270 MPa tensile and 225 MPa yield for 6005A. 6005A trades some strength for superior extrudability and thin-wall capability, so it's chosen for profile geometry rather than peak strength.
Why use 6005A for solar and structural extrusions?
6005A extrudes faster and supports thinner, more complex thin-wall profiles than 6061, improving press yield and enabling lighter sections. It still offers good T6 strength (~225 MPa yield) and slightly higher thermal conductivity (180 W/m·K). That combination makes it a common choice for solar mounting rails and structural framing profiles.
Can 6005A and 6061 be welded?
Yes, both are readily weldable 6xxx alloys, typically with 4043 or 5356 filler. Like all heat-treatable 6xxx alloys, both lose strength in the heat-affected zone and may need post-weld aging to recover properties. Their weld behavior is similar, so weldability is rarely the deciding factor between them.
Property values are typical/nominal figures for early-stage guidance only and vary by temper, grade, supplier and heat treatment. Confirm critical specifications against a certified datasheet or with an mfgiq engineer before production.