EN
Aluminum 6082 and 7075-T6 are two of the most frequently specified grades in CNC machining, and on the surface they look interchangeable: both are heat-treatable, both machine well, and both are stocked by most machine shops. In practice, they serve very different purposes. 6082 is a versatile medium-strength structural alloy, while 7075-T6 is an aerospace-grade material with nearly twice the strength. Picking the right one early in the design stage protects your budget, your lead time, and the service life of the part.
6082 belongs to the 6000 series, where magnesium and silicon are the main alloying elements. In the T6 temper it delivers a typical tensile strength of 310–340 MPa and a yield strength around 260–280 MPa, which places it at the top of the 6000-series family. It is especially common in European supply chains, where it is covered by EN 755 and often treated as the regional equivalent of 6061.
For CNC work, 6082 offers a practical balance: it machines predictably, holds tight tolerances without fuss, produces excellent surface finishes, and responds very well to anodizing. Its corrosion resistance is among the best of the heat-treatable alloys, and it can be welded without losing its structural role. For brackets, housings, fixtures, frames, and general machine components, it is usually the most economical way to get reliable mechanical performance.
7075 is a 7000-series alloy in which zinc is the primary alloying element. In the T6 temper it reaches a typical tensile strength of 510–570 MPa with yield strength around 430–505 MPa — approaching the level of some steels at roughly one third of the weight. That is why it has been the default aerospace aluminum for decades.
This performance comes with trade-offs. 7075-T6 is noticeably more expensive, its corrosion resistance is only moderate (the T6 condition is sensitive to stress corrosion cracking, which is why the overaged T73 temper exists), and it is generally considered unsuitable for fusion welding. It also machines a little harder: cutting forces are higher and tool wear is somewhat greater, although it produces short, clean chips and holds dimensional accuracy very well.
| Property (typical, T6 temper) | 6082-T6 | 7075-T6 |
|---|---|---|
| Tensile strength | 310–340 MPa | 510–570 MPa |
| Yield strength | 260–280 MPa | 430–505 MPa |
| Brinell hardness | ~95 HB | ~150 HB |
| Density | 2.70 g/cm³ | 2.81 g/cm³ |
| Corrosion resistance | Excellent | Moderate; SCC-sensitive in T6 |
| Weldability | Good | Poor — avoid fusion welding |
| Anodizing response | Excellent, consistent finish | Good; slight color variation possible |
| Machinability | Very good and forgiving | Good; higher tool wear |
| Material cost | Lower | Significantly higher |
From a machinist's point of view, neither alloy is difficult, but they behave differently. 6082 is softer and more forgiving of aggressive feeds, wide tolerances in setups, and less rigid workholding. It is a comfortable choice for thin-walled parts and complex milling where chatter control matters. 7075-T6 cuts with higher forces and wears tools faster, but it rewards rigid setups with exceptional dimensional stability — an important reason it is favored for precision aerospace CNC machining components where tolerances of a few microns must hold across the whole part.
Both alloys achieve excellent surface finishes directly from the tool, and both respond well to hard anodizing. If the part will be color-anodized for cosmetic reasons, 6082 gives the more consistent and predictable appearance; 7075 can take on a slightly golden or uneven tint because of its zinc content.
If stress corrosion is a concern in a high-strength application, ask your machining partner about 7075-T73: it trades a modest amount of strength for a large improvement in stress corrosion resistance.
Material choice should follow real load cases, corrosion exposure, joining methods, and budget — not habit. An experienced metal CNC machining shop can review your drawing, run a DFM check, and tell you honestly whether 6082 will do the job or whether 7075-T6 is worth the investment.
ANOK Precision Manufacturing machines both grades every day. As an ISO 9001:2015 certified factory in Shenzhen with 3-, 4-, and 5-axis machining centers, ANOK provides CNC machining aluminum services covering 6061, 6082, and 7075-T6, with tolerances down to ±0.002 mm and in-house anodizing and surface treatment. Send your drawings for a free review and quotation — the team will recommend the grade that meets your performance targets without overspending.