6061 aluminum square bar is a heat-treatable, extruded section that pairs good machinability with strength, weldability, and corrosion resistance. It is a dependable choice for structural frames, fixtures, fasteners, and general engineering parts.
Available forms: square bar / rectangular bar
Common tempers: O / T4 / T6 / T651 / T6511
Processing support: cut-to-length / CNC machining / anodizing / polishing
Quality documents: MTC report with every order
6061 square bar is an extruded profile with a square cross-section, commonly supplied in the T6 temper for maximum strength and dimensional stability. Its balance of machinability and corrosion resistance makes it a go-to section for both structural and precision-engineering work.
Square bars are supplied with side dimensions from 8 mm to 300 mm and lengths of 1000 – 6000 mm. T6511 is the standard extruded-and-stress-relieved temper for bars.
| Form | Temper | Side (mm) | Length (mm) |
|---|---|---|---|
| Square bar | T6, T651, T6511 | 8 – 300 | 1000 – 6000 |
| Element | Content (%) |
|---|---|
| Silicon (Si) | 0.40 – 0.80 |
| Iron (Fe) | 0.70 max |
| Copper (Cu) | 0.15 – 0.40 |
| Manganese (Mn) | 0.15 max |
| Magnesium (Mg) | 0.80 – 1.20 |
| Chromium (Cr) | 0.04 – 0.35 |
| Zinc (Zn) | 0.25 max |
| Titanium (Ti) | 0.15 max |
| Others (each) | 0.05 max |
| Others (total) | 0.15 max |
| Aluminum (Al) | Remainder |
The values below are typical room-temperature properties for 6061 and are representative of extruded, drawn, or rolled product. Exact numbers vary with section size and product form; final inspection is reported on the MTC.
| Temper | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Brinell Hardness (HB) |
|---|---|---|---|---|
| O | 124 | 55 | 25 | 30 |
| T4 | 241 | 145 | 22 | 65 |
| T6 | 310 | 276 | 12 | 95 |
| T651 | 310 | 276 | 12 | 95 |
6061 machines cleanly in T6, making it efficient for screw-machine products, fittings, and repeating components.
The square geometry provides predictable load paths for frameworks, jigs, and supports.
Good in most atmospheric environments; anodizing adds a durable, decorative surface.
Linsy Aluminum is a Shenzhen-based supplier with more than 20 years of experience in distributing and processing aluminum alloys from the 1000 to 8000 series. We support buyers with cut-to-length, CNC machining, welding preparation, surface finishing, and documented quality control.
Orders are handled against agreed lead times, and each lot is shipped with the corresponding MTC. Our team works with procurement, engineering, and fabrication customers to match the right temper and form to the application.
T6 and T6511 are the most common for structural and machined bars; T6511 adds stress relief for better stability after cutting.
Yes. 6061 anodizes well and is frequently specified for architectural and decorative sections.
It welds well with standard aluminum processes; design for some strength loss in the heat-affected zone.
Standard stock sizes are usually dispatched within 10 – 60 days depending on temper, form, and finishing. Custom-cut or specially heat-treated material is confirmed at quotation.
Yes. An MTC is supplied with every order, and third-party test reports (for example SGS) can be arranged on request.
We can work to ASTM, EN, GB/T, JIS, and customer-specific drawings. Please share the required standard when requesting a quote.
Yes. Cutting-to-length, CNC machining, and basic fabrication are available; discuss your requirements when ordering.
Linsy Advantages
Linsy Aluminum is a leading supplier of aluminum processing products, serving diverse industries including aerospace, general engineering, automotive, marine, shipbuilding and other specialized industrial applications.
We are committed to maintaining the highest standards of quality and environmental responsibility, as demonstrated by our certifications: ISO 9001:2008， ISO 14001:2004 and SGS.
