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.
See Cutting Speeds for Aluminum and the full Feeds and Speeds Chart.