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CNC Machining
Aluminium 7075-T651 is a high-strength, lightweight alloy with a natural silver-white appearance. Its strength relative to weight makes it useful for precision structural components, loaded brackets and tooling fixtures.
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 during CNC machining, particularly when producing parts from thick plate.
Custom parts are produced using CNC milling or turning, leaving fine tooling marks on as-machined surfaces. Anodising can be specified where available for surface protection, although colour and appearance may vary. Corrosive environments require careful consideration of protective finishes.
Material
Aluminium 7075-T651
Description
Strengths
High strength relative to weight and good hardness. Stress relief helps improve stability during precision machining.
Weaknesses
Poor conventional fusion weldability, limited formability and susceptibility to stress-corrosion cracking. Elevated temperatures can reduce strength.
Silver White
Ultimate tensile strength
540–570 MPa
Yield strength
470–500 MPa
Modulus of elasticity
71–72 GPa
Elongation at break
8–11%
Density
2.81 g/cm³
Hardness
150 HB
Corrosion resistance
Limited
Magnetism
Non-magnetic
UK equivalent
Maximum service temperature
200°C
Thermal expansion coefficient
23.6 × 10⁻⁶ /°C
Thermal conductivity
130 W/(m·°C)
Electrical resistivity
5.15 µΩ·cm
Anodising compatibility
Suitable
Weldability
Low
Precision structural parts
Tooling fixtures
Motorsport components
Aerospace components.
Values shown are typical supplier figures for Aluminium 7075-T651 and may vary with stock condition. Please confirm critical properties before production.
T651 plate is stress-relieved by stretching after heat treatment, which reduces residual stress and helps limit distortion when machining thick or heavily pocketed parts.
Yes. It combines very high strength relative to weight with good hardness and machinability, which makes it a common choice for precision structural parts, tooling fixtures and motorsport components.
The stress-relieved condition helps hold flatness and positional accuracy on plate parts. 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 is suitable for anodising, which improves surface protection. Conventional fusion welding is not recommended, so design 7075-T651 parts to be bolted or bonded instead.
7075-T651 is significantly stronger and harder, while 6061-T651 offers better corrosion resistance and weldability. Choose 7075-T651 for highly loaded parts, and 6061-T651 for general fixtures and housings.
The typical lead time shown for 7075-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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