Aluminum 6061 Supplier

Aluminum 6061 is a versatile and widely used aluminum alloy in manufacturing, construction, and engineering, known for its excellent balance of strength, corrosion resistance, weldability, and machinability.

Southern Tool Steel stocks 6061 aluminum in a wide range of forms, sizes, and tempers, available for order nationwide. Whether you need plate, bar, tube, or structural shapes, our team can help you find the right material for your application.

What is Aluminum 6061?

Aluminum 6061 is a heat-treatable, highly formable, and weldable alloy with moderately high strength and excellent corrosion resistance. The major alloying elements are magnesium and silicon, which combine to form magnesium silicide within the alloy, contributing to its strength and heat treatability.

Originally developed in 1935, 6061 has become one of the most commonly used aluminum alloys for general-purpose applications. It belongs to the 6xxx series of heat-treatable aluminum alloys and is available under UNS designation A96061.

Chemical Composition

The following table reflects the chemical composition limits of Aluminum 6061 per the Aluminum Association.

What is 6061 Aluminum Used For?

Aluminum 6061 is a preferred material across heavy industrial and manufacturing sectors, where its combination of structural strength, weldability, and corrosion resistance makes it a reliable and cost-effective choice. Common industrial applications include:

• Truck frames, rail coaches, and transportation structural components
• Aerospace frames, fittings, and helicopter rotor skins
• Shipbuilding and marine structural assemblies
• Military and commercial bridge construction
• Towers, pylons, and wide-span roof structures
• Automotive manufacturing fixtures and production line tooling
• Machine frames, automation equipment, and conveyor assemblies
• Welded structural assemblies and load-bearing frames
• Chemical processing equipment requiring corrosion resistance
• Mechanical brackets, jigs, fixtures, and mold bases
• Valves, couplings, and industrial fittings
• Boilermaking and pressure vessel components

Key Properties and Characteristics

Machinability

Aluminum 6061 offers good machinability, particularly in its T6 temper. The precipitation hardening process used to achieve the T6 condition increases surface hardness, making the material less gummy and easier to cut than softer tempers. Aluminum 6061 carries a machinability rating of approximately 90, making it one of the more machinable metals available and significantly easier to machine than most steels.

Strength-to-Weight Ratio

One of 6061's most commercially significant attributes is its strength-to-weight ratio. In its T6 temper, 6061 aluminum achieves a tensile strength of approximately 310 MPa (45,000 psi) and a yield strength of approximately 276 MPa (40,000 psi), at a density of only 2.70 g/cm3 (0.0975 lb/in3). This gives 6061-T6 mechanical performance comparable to certain mild steels at roughly one-third of the weight, making it a preferred choice in aerospace, automotive, and marine applications where reducing weight without sacrificing structural performance is a priority.

Corrosion Resistance

Aluminum 6061 offers good corrosion resistance across a wide range of environments. The alloy naturally forms a stable protective oxide layer on its surface, which provides reliable protection against atmospheric corrosion and moisture. This makes 6061 well-suited for outdoor structural applications, marine hardware, and components exposed to the elements. For applications requiring enhanced corrosion protection, 6061 also responds well to anodizing and other surface treatments.

Weldability

Weldability is one of 6061's defining strengths and a major reason it is preferred over higher-strength alloys like 7075 in many structural applications. Aluminum 6061 can be welded using standard methods, including MIG and TIG welding. It is compatible with common aluminum filler alloys such as 4043 and 5356. One consideration is that welding can reduce the temper-specific mechanical properties in the heat-affected zone, so that post-weld heat treatment may be appropriate in strength-critical applications.

Temper Designations

 The mechanical properties of 6061 aluminum vary significantly depending on the temper designation, which reflects the specific heat treatment and processing the material has undergone. Selecting the right temper is as important as selecting the alloy itself.

6061-O (Annealed)

6061-O is fully annealed, resulting in the lowest strength but the highest ductility and formability of any 6061 temper. It is the preferred option for applications requiring extensive forming, bending, or deep drawing. Tensile strength is approximately 18 ksi, and yield strength is approximately 8 ksi in this condition. Machinability is reduced in this temper due to the softer, gummier material behavior.

6061-T4

6061-T4 is solution heat-treated and then naturally aged to a stable condition. This temper offers a middle ground between formability and strength, with a tensile strength of approximately 35 ksi and a yield strength of approximately 21 ksi. It is well-suited for parts that require further forming or welding after fabrication.

6061-T6

6061-T6 is the most commonly requested temper. It is produced by solution heat-treating the alloy, quenching, and then artificially aging it in a furnace to achieve precipitation hardening. This process delivers the highest strength of the standard 6061 tempers, with a tensile strength of approximately 45 ksi and a yield strength of approximately 40 ksi. 6061-T6 offers good machinability and is widely used for structural components, machine parts, and precision fabrications.

6061-T651

6061-T651 shares the same strength characteristics as T6 but includes an additional stress-relief step through controlled stretching. This process reduces internal stresses introduced during quenching, resulting in improved dimensional stability and reduced distortion during machining. T651 is the preferred temper for precision machining applications, mold manufacturing, and aerospace components where tight tolerances must be maintained.

Available Forms and Sizes

Southern Tool Steel stocks 6061 aluminum in a wide range of forms to support diverse manufacturing and fabrication requirements. Available product forms include:

• Sheet

• Plate

• Bar: Round, Square, Flat, Hexagon, Oval 

• Pipe

• Tube: Rectangle, Round, Square

• Structural: Angle, Beam, Channel, Tee, Zee

If you require a specific size, thickness, or temper not listed, contact our team to discuss availability and lead times.

6061 vs Other Aluminum Alloys

When evaluating aluminum grades, 6061 is often considered alongside several other alloys.

6061 vs. 7075

7075 offers significantly higher strength than 6061, making it common in high-stress aerospace and defense applications. However, 7075 has lower weldability, reduced corrosion resistance, and comes at a higher cost. For applications where weldability and corrosion resistance are important alongside moderate-to-high strength, 6061 is the more practical choice.

6061 vs. 6063

6063 is closely related to 6061 but is optimized for extrusion and surface finish rather than structural strength. It is a common choice for architectural profiles such as window frames and door frames. 6061 offers higher strength and is better suited for structural and load-bearing applications where 6063 would be insufficient.

6061 vs. 5052

5052 provides superior corrosion resistance, particularly in marine and saltwater environments, and performs well in applications requiring extensive forming. Unlike 6061, 5052 is not heat-treatable, which limits the strength levels it can achieve. For applications requiring both good corrosion resistance and higher mechanical strength, 6061 in the appropriate temper is generally the better selection.

Order 6061 Aluminum From a Trusted Supplier

At Southern Tool Steel, we are known as a supplier of high-quality tool steel and other metals. Our broad range of materials, from steel, aluminum, and brass to bronze and copper, is available for distribution nationwide, with no minimum order required.

Advantages of ordering from Southern Tool Steel include:

• Consistent quality meeting necessary specifications
• Available in various sizes and forms
• Expert technical support for material selection
• Fast delivery nationwide
• Competitive pricing with no minimum orders
• Material certifications available upon request

Contact our service team today for more information and to discuss your specific application, or order online today.

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