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What is Aluminium 6061-T6?

CNC Machining

Aluminium 6061 is a lightweight, versatile metal alloy with a natural silver-grey appearance. It combines strength and corrosion resistance, making it a practical choice for custom brackets, housings, fixtures and mechanical components.

Parts are CNC machined from solid aluminium using precision milling or turning. These processes create accurate features, including holes, pockets and threads. Final strength depends on the supplied material temper, such as T6 or T651.

As-machined surfaces retain fine tooling marks for a clean, functional finish. Additional finishes, such as bead blasting or anodising, can be specified where available to alter appearance and improve surface protection.

Material

Aluminium 6061 - T6

Description

Strengths

Lightweight, good machinability, corrosion resistance and weldability. Suitable for precise components and anodised finishes.

Weaknesses

Lower strength than 7075 aluminium. Welding can weaken heat-treated areas, and elevated temperatures can reduce strength.

Colour & Finishes

Silver white

Mechanical properties

Ultimate tensile strength

260–310 MPa

Yield strength

240–270 MPa

Modulus of elasticity

68–74 GPa

Elongation at break

8–11%

Physical properties

Density

2.70 g/cm³

Hardness

Not specified

Corrosion resistance

High

Magnetism

Non-magnetic

UK equivalent

Thermal properties

Maximum service temperature

130–150°C

Thermal expansion coefficient

22.7–23.9 × 10⁻⁶ /°C

Thermal conductivity

152–169 W/(m·°C)

Electrical properties

Electrical resistivity

3.9–4.1 μΩ·cm

Post treatments

Anodising

Suitable

Weldability

High

Common applications

Automotive brackets & housings

Marine fittings

Electrical fittings & enclosures

Couplings & valve bodies

Values shown are typical supplier figures for Aluminium 6061 and may vary with stock condition. Please confirm critical properties before production.

Frequently asked questions

Is aluminium 6061 easy to CNC machine?

Yes. 6061 is one of the most machinable aluminium alloys. It cuts cleanly, forms manageable chips and suits both milling and turning, which makes it a cost-effective choice for prototypes and production parts.

What tolerances can be held on aluminium 6061 parts?

6061 is dimensionally stable and well suited to precision features such as bores, slots and threaded holes. Achievable tolerances depend on part size, geometry and features, so mark any critical tolerances on a 2D drawing with your upload and they will be reviewed and confirmed in your quote.

Can aluminium 6061 be anodised?

Yes. 6061 anodises well, giving a protective, decorative finish in clear or coloured options where available. Bead blasting before anodising gives an even matt appearance. Request the finish you need when you upload your part.

What is aluminium 6061 typically used for?

Typical uses include automotive brackets and housings, marine fittings, electrical fittings and enclosures, and couplings and valve bodies, where light weight, corrosion resistance and good machinability are needed.

Should I choose 6061 or 7075 aluminium?

Choose 6061 for general-purpose parts that need good corrosion resistance, weldability and anodising at a sensible cost. Choose 7075 when the part needs much higher strength and hardness and will not be welded. 6082 is a close alternative to 6061 for structural parts.

How long does it take to make aluminium 6061 parts?

The typical lead time shown for aluminium 6061 is 10 business days from an approved order. Quantity, finishing and any heat treatment can affect this, and your quote confirms the date before you order.

CNC Aluminium 6061-T6