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CNC Machining
Aluminium 6061-T651 is a lightweight engineering alloy with a natural silver-white appearance. It offers a practical balance of strength, corrosion resistance and machinability for fixtures, housings, brackets and structural components.
The T651 temper means the material has been solution heat-treated, stress-relieved by stretching and artificially aged. This treatment reduces residual stresses and helps limit distortion during CNC machining, making it useful for precision parts machined from plate.
Parts are produced using CNC milling or turning, with fine tooling marks remaining on as-machined surfaces. Anodising can be specified where available to improve surface protection and provide a decorative finish.
Material
Aluminium 6061-T651
Description
Strengths
Lightweight, good machinability, corrosion resistance and dimensional stability. Suitable for anodising.
Weaknesses
Limited formability in the T651 condition. Welding and prolonged exposure to elevated temperatures can reduce strength.
Silver White
Ultimate tensile strength
290–330 MPa
Yield strength
250–270 MPa
Modulus of elasticity
69–70 GPa
Elongation at break
8–11%
Density
2.70 g/cm³
Hardness
95 HB
Corrosion resistance
High
Magnetism
Non-magnetic
UK equivalent
Maximum service temperature
170°C
Thermal expansion coefficient
23.6–24 × 10⁻⁶ /°C
Thermal conductivity
167–170 W/(m·°C)
Electrical resistivity
Not specified
Anodising compatibility
Suitable
Weldability
High
Automotive Industry
Aerospace Industry
Marine Industry
construction and sporting goods
Values shown are typical supplier figures for Aluminium 6061-T651 and may vary with stock condition. Please confirm critical properties before production.
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.
Yes. Its stress-relieved condition and good machinability make it a common choice for fixture plates, jigs, adapters and housings machined from plate, where flatness and stability matter.
The stress-relieved temper helps hold flatness and position on larger plate parts and parts with deep pockets. 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.
It anodises well for protection and a decorative finish where available. It can also be welded, although welding and prolonged exposure to elevated temperatures reduce strength around the heat-affected area.
6061-T651 suits most fixtures, brackets and housings and offers better corrosion resistance and weldability. 7075-T651 is the better choice when strength and hardness are the priority, for example highly loaded tooling or motorsport parts.
The typical lead time shown for 6061-T651 aluminium 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.
Parts in as fast as 10 business days
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