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What is Aluminium 6082-T651?

CNC Machining

Aluminium 6082-T651 is a lightweight engineering alloy with a natural silver-white appearance. It combines good strength, corrosion resistance and machinability, making it suitable for tooling plates, fixtures, brackets and structural components.

The T651 temper means the material has been solution heat-treated, stress-relieved by stretching and artificially aged. This reduces residual stresses and helps limit distortion when machining substantial amounts of material from plate.

Custom parts are produced using CNC milling or turning. As-machined surfaces retain fine tooling marks. Anodising can be specified where available for surface protection, although decorative colour and appearance may be less uniform than on aluminium 6063.

Material

Aluminium 6082-T651

Description

Strengths

Good strength relative to weight, corrosion resistance and machinability. Stress-relieved condition helps improve machining stability.

Weaknesses

Limited formability and tight-radius bending. Welding can reduce local strength. Machining distortion remains possible, and decorative anodising may appear uneven.

Colour & Finishes

Silver White

Mechanical properties

Ultimate tensile strength

275–320 MPa

Yield strength

240–270 MPa

Modulus of elasticity

69–70 GPa

Elongation at break

6–10%

Physical properties

Density

2.70 g/cm³

Hardness

95 HB

Corrosion resistance

High

Magnetism

Non-magnetic

UK equivalent

HE30

Thermal properties

Maximum service temperature

150°C

Thermal expansion coefficient

23.4 × 10⁻⁶ /°C

Thermal conductivity

170 W/(m·°C)

Electrical properties

Electrical resistivity

3.5 µΩ·cm

Post treatments

Anodising compatibility

Suitable

Weldability

High

Common applications

Tooling plates

Structural components

Machining fixtures

Truss components and heat sinks

Values shown are typical supplier figures for Aluminium 6082-T651 and may vary with stock condition. Please confirm critical properties before production.

Frequently asked questions

What does T651 mean for aluminium 6082?

T651 means the alloy has been solution heat-treated, stress-relieved by stretching and artificially aged. The stretching reduces residual stresses, so plate is less likely to distort as material is removed.

Is 6082-T651 good for precision machined parts?

Yes. Its stress-relieved condition, good strength and machinability make it a common choice for tooling plates, fixtures and structural parts machined from plate.

How does 6082-T651 differ from 6082-T6?

Both tempers are artificially aged to a similar strength level. T651 plate is additionally stress-relieved by stretching, which helps limit distortion during heavier machining.

Can 6082-T651 be anodised?

Yes. Anodising is suitable for surface protection. Decorative colour and appearance may be less uniform than on aluminium 6063, so this should be considered where a cosmetic finish is important.