7075 is a high-strength aerospace aluminum, stronger than 6061 but still very machinable. Treat it like 6061 with a slightly lighter touch: high surface speeds, sharp tools, and good chip clearing.
Key properties
| Property | Typical value |
|---|---|
| Density | 0.101 lb/in³ (2.81 g/cm³) |
| Hardness | ~150 HB |
| Tensile strength (T6) | ~83,000 psi (572 MPa) |
| Machinability | Excellent |
| Composition | Al with Zn, Mg, Cu |
Cutting speeds
| Operation | HSS (SFM) | Carbide (SFM) |
|---|---|---|
| Milling | 200 – 300 | 600 – 1000 |
| Turning | 250 – 350 | 500 – 900 |
| Drilling | 150 – 250 | 350 – 550 |
Convert to RPM: RPM = (SFM × 3.82) / cutter diameter. Use the Feeds & Speeds calculators.
Tooling and tips
- 2–3 flute, uncoated or ZrN carbide, high helix.
- Flood or mist coolant to flush chips and prevent built-up edge.
- Stronger than 6061, so ease off the very top feeds; otherwise machine it the same way.
FAQ
Is 7075 harder to machine than 6061? Somewhat. 7075 is a higher-strength aerospace-grade alloy that generates more cutting force and heat than 6061, though it still machines well with sharp tooling and adequate speed, producing good surface finish and dimensional stability.
See Cutting Speeds for Aluminum and the full Feeds and Speeds Chart.