Henan Gnee New Material Co., Ltd. is one of the most reliable manufacturers and suppliers of 6061-T6511 Aluminum Flat Bar in China. With abundant experience, we warmly welcome you to wholesale high quality 6061-T6511 Aluminum Flat Bar in stock here from our factory. Good service and reasonable price are available.
To request a quote, send the flat-bar dimensions (thickness × width × length), temper, surface finish, quantity, and the standard you need. We confirm the specification and lead time before production and return a written quote with MOQ, unit price, and documentation. Request a quote for 6061-T6511 aluminum flat bar.
What is 6061-T6511 aluminum flat bar
6061 is a heat-treatable 6xxx-series alloy built around the magnesium–silicon (Mg₂Si) precipitation system. In the T6511 condition it delivers a practical balance of strength, weldability, machinability, and corrosion resistance at roughly one-third the weight of steel. The T6511 temper is specific to extruded bar, rod, and profiles: after aging, the section is stretched a small amount to remove residual stress, then lightly straightened. That stress relief is why 6061-T6511 is the default choice for CNC-machined parts that must hold tolerances after material is removed. The product is supplied to ASTM B221 and EN 755; it carries a mill finish and commercial straightness typical of extrusion, which is normal for structural and machined use.
Chemical composition of 6061 aluminum flat bar
| Element | Content (wt%) |
|---|---|
| Silicon (Si) | 0.40 – 0.80 |
| Iron (Fe) | ≤ 0.70 |
| Copper (Cu) | 0.15 – 0.40 |
| Manganese (Mn) | ≤ 0.15 |
| Magnesium (Mg) | 0.80 – 1.20 |
| Chromium (Cr) | 0.04 – 0.35 |
| Zinc (Zn) | ≤ 0.25 |
| Titanium (Ti) | ≤ 0.15 |
| Others, each | ≤ 0.05 |
| Others, total | ≤ 0.15 |
| Aluminum (Al) | Remainder |
Composition follows EN 573-3 and ASTM B221 for alloy 6061.
Mechanical properties of 6061-T6511 aluminum bar
| Property | Typical / minimum value |
|---|---|
| Tensile strength (UTS) | 262 MPa (38 ksi) minimum per ASTM B221; typical lots test near 310 MPa (45 ksi) |
| Yield strength (0.2% offset) | 241 MPa (35 ksi) minimum per ASTM B221; typical near 276 MPa (40 ksi) |
| Elongation in 50 mm | 8% minimum for thickness ≤ 6.35 mm; 10% minimum for thickness ≥ 6.35 mm |
| Brinell hardness | ~95 HB (typical) |
| Density | 2.70 g/cm³ |
| Elastic modulus | 68.9 GPa (10,000 ksi) |
| Thermal conductivity | ~167 W/m·K (typical) |
| Electrical conductivity | ~40% IACS (typical) |
Values are typical for the T6511 temper per ASTM B221 and are a guide; exact lot values are recorded on the EN 10204 3.1 MTC.
Specifications of 6061-T6511 aluminum flat bar
The summary below covers the standard supply scope for 6061-T6511 extruded flat bar. Full chemical and mechanical tables, tolerances, and processing options follow.
| Item | Specification |
|---|---|
| Alloy | 6061 |
| Temper | T6511 (solution heat treated, artificially aged, stretched to relieve residual stress) |
| Product form | Extruded rectangular bar (flat bar) |
| Available thickness | 3 – 50 mm (1/8" – 2") |
| Available width | 12 – 300 mm (1/2" – 12") |
| Available length | Up to 6000 mm; standard stock 3000 / 6000 mm, cut-to-length on request |
| Standards | ASTM B221, EN 755, EN 573-3 |
| Standard surface finish | Mill finish (as-extruded). Optional: anodizing (clear / colored), powder coating, polishing, brushing |
| Density | 2.70 g/cm³ |
| Tensile strength (UTS) | 262 MPa (38 ksi) minimum per ASTM B221; typical ~310 MPa (45 ksi) |
| Yield strength (0.2% offset) | 241 MPa (35 ksi) minimum per ASTM B221; typical ~276 MPa (40 ksi) |
| Elongation in 50 mm | 8% (thickness ≤ 6.35 mm) / 10% (thickness ≥ 6.35 mm) |
| Brinell hardness | ~95 HB (typical) |
| Certificate | EN 10204 3.1 MTC; 3.2 and third-party inspection on request |
| Lead time | 15 – 30 days from order confirmation |
| Minimum order | Flexible - trial quantities and full containers quoted on the same terms |
Dimensions and tolerances of 6061 aluminum flat bar
Our common extruded stock range is thickness 3–50 mm (1/8"–2"), width 12–300 mm (1/2"–12"), in lengths up to 6 m (12 ft is a common stock length). Sizes outside this range and non-standard rectangles are produced to your drawing.
| Cross-section dimension | Tolerance (±), per ANSI H35.2 / ASTM B221 |
|---|---|
| Up to 3.15 mm (0.124 in) | ±0.15 mm (±0.006 in) |
| 3.18 – 6.32 mm (0.125 – 0.249 in) | ±0.18 mm (±0.007 in) |
| 6.35 – 12.67 mm (0.250 – 0.499 in) | ±0.20 mm (±0.008 in) |
| 12.70 – 19.03 mm (0.500 – 0.749 in) | ±0.23 mm (±0.009 in) |
| 19.05 – 25.37 mm (0.750 – 0.999 in) | ±0.25 mm (±0.010 in) |
| 25.40 – 38.07 mm (1.000 – 1.499 in) | ±0.30 mm (±0.012 in) |
| 38.10 – 50.79 mm (1.500 – 1.999 in) | ±0.36 mm (±0.014 in) |
| 50.80 – 101.57 mm (2.000 – 3.999 in) | ±0.61 mm (±0.024 in) |
| 101.60 – 152.37 mm (4.000 – 5.999 in) | ±0.86 mm (±0.034 in) |
| 152.40 – 203.17 mm (6.000 – 7.999 in) | ±1.12 mm (±0.044 in) |
Applications of 6061 aluminum flat bar
Structural framing and machine bases - jigs, fixtures, frames, and supports where flat, machinable stock is needed.
Automotive and trailer bodies - mounting rails, brackets, and sub-frames benefiting from low weight and weldability.
Marine and offshore fittings - deck hardware, railings, and brackets in non-continuous-immersion service.
Architectural and building components - trims, posts, and structural members with anodized or painted finish.
Electrical and electronic parts - heat sinks, enclosures, and busbar supports using 6061's thermal and electrical conductivity.
Railway and transport - interior structures and equipment mounts.
Furniture and fixtures - tables, frames, and display structures.
Screw-machine and CNC parts - precision components where T6511's stress relief keeps dimensions stable after machining.
Welding and fabrication of 6061 aluminum flat bar
Welding. 6061 welds readily by MIG and TIG. Use 4043 filler for general joints and 5356 where higher post-weld strength or marine service is required. Note that the heat-affected zone loses some strength relative to the T6 base; for designs needing full joint strength, plan the weld and consider 5356 or post-weld aging where the standard allows.
Forming and machining. The T6511 temper is stress-relieved, so the bar machines cleanly and holds dimension well in CNC work - this is its main advantage over untreated extruded stock. Cold bending and forming are limited in the aged condition; if tight radii are needed, form in O or T4 temper and then age to T6, or discuss the bend requirement with our engineers.
Corrosion care. 6061 has good general corrosion resistance. To avoid galvanic corrosion, do not place it in direct, moist contact with steel or copper without isolation, and prefer compatible fasteners. Anodizing or painting improves surface wear and appearance.
Processing services for 6061 aluminum flat bar
Cutting to length: square or miter saw cuts to your required length.
CNC machining: drilling, tapping, milling, and countersinking per drawing.
Surface treatment: bright drawing, polishing, brushing, anodizing (clear or colored), and powder coating.
Welding and assembly: MIG/TIG with matching or specified filler.
Special sections: non-standard rectangles and profiles produced to drawing.
Send the finished-part drawing and we quote material and processing together.
Inspection and testing of 6061-T6511 aluminum bar
Alloy verification: per-lot XRF / PMI confirms the 6061 chemistry.
Mechanical check: tensile per ASTM B557 and hardness per ASTM E10.
Dimensional check: thickness, width, length, and straightness to ASTM B221 / ANSI H35.2.
Surface and finish: checked for obvious cracks, seams, and deep scratches.
Documentation: EN 10204 3.1 MTC; 3.2 and third-party inspection on request.
Test methods follow ASTM E1251 / E572, ASTM B557, ASTM E10, and ASTM B221.
Packaging of 6061 aluminum flat bar
Bundling: strapped bundles with end caps to protect the cut faces.
Protection: moisture-barrier (VCI / PE) wrap for sea transport.
Crating: wooden crate or pallet where needed for long or heavy sections.
Marking: alloy, temper, size, lot/heat number, and PO for traceability.
About GNEE
Aluminum exporter since 2008. GNEE ships wrought aluminum products to more than 100 countries and regions.
6061 flat bar held and produced to order. Common extruded rectangles are stocked; larger or non-standard sections are run against your drawing.
Small and large orders both accepted. MOQ is flexible - trial quantities and full containers are quoted on the same terms.
Lead time 15–30 days from order confirmation for standard specifications.
Documentation with every shipment. EN 10204 3.1 MTC as standard; 3.2 and third-party inspection arranged on request.
Material selected for the job. Our engineers review your drawing and ask about load, environment, and weld plan before recommending temper and finish.
Request a quote for 6061-T6511 aluminum flat bar
Send your requirement - thickness × width × length, temper (T6511 or other), surface finish, quantity, and standard (ASTM B221 / EN 755). We return a written quote covering exact dimensions and tolerances, surface finish, packaging, MOQ, unit price, and the 15–30 day lead time. Unit price is quoted against the SMM aluminum ingot index and confirmed in writing. Terms are FOB or CIF with payment by T/T or L/C; EN 10204 3.1 MTC ships with the order and 3.2 / third-party inspection is available on request.
FAQ
Is 6061-T6511 aluminum flat bar weldable?
Yes. 6061 welds well by MIG and TIG using 4043 filler for general work or 5356 where higher joint strength or marine service is needed. The heat-affected zone is softer than the T6 base, so design joints with that in mind. Post-weld aging can recover some strength where the applicable standard permits it.
What sizes and tolerances does 6061 aluminum flat bar come in?
Common extruded stock runs from 3 mm to 50 mm thick and 12 mm to 300 mm wide, in lengths up to 6 m, with cross-section tolerances per ANSI H35.2 / ASTM B221 (for example ±0.20 mm on a 6–12 mm section, widening for larger sizes). Custom rectangles and tighter tolerances are produced to drawing.
What is the difference between 6061-T6511 and 6061-T6 aluminum flat bar?
T6511 is the extruded, stress-relieved-by-stretching temper used for rectangular bar made by extrusion. "T6" on a flat bar usually means the rectangle was cut from plate (T651) rather than extruded, or the bar was cold-finished. For machined parts that must stay flat and stable, extruded T6511 is the practical choice; for a tighter, plate-cut blank, a T651 plate-cut section may suit better. Tell us how you will machine and finish the part and we will recommend the right route.
Request a quote for 6061-T6511 aluminum flat bar - send thickness × width × length, temper, finish, quantity, and standard, and GNEE returns a quote with MTC and lead time.
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