Aluminum 6061 vs Brass C360 for CNC: Lightweight vs Machinability
Aluminum 6061 wins on weight (3x lighter) and overall versatility. Brass C360 wins on pure machinability and is preferred for fittings, connectors, and decorative parts where its gold appearance and conductivity are advantages.
Side-by-Side Property Comparison
| Property | Aluminum 6061-T6 | Brass C360 (Free-Cutting Brass) |
|---|---|---|
| Tensile Strength | 310 MPa (45 ksi) | 385 MPa (56 ksi) |
| Yield Strength | 276 MPa (40 ksi) | 310 MPa (45 ksi) |
| Hardness | 95 HB (Brinell) | 78 HRB |
| Density | 2.70 g/cm³ | 8.49 g/cm³ |
| Machinability Rating | 90/100 | 100/100 |
| Thermal Conductivity | 167 W/m·K | 115 W/m·K |
| Melting Point | 582–652 °C | 885–900 °C |
| Tolerance | ±0.02 mm | ±0.02 mm |
Key Differences
| Property | Aluminum 6061-T6 | Brass C360 (Free-Cutting Brass) | Winner |
|---|---|---|---|
| Weight (Density) | 2.70 g/cm³ | 8.49 g/cm³ | Aluminum |
| Machinability | 90/100 | 100/100 | Brass |
| Tensile Strength | 310 MPa | 385 MPa | Brass |
| Thermal Conductivity | 167 W/m·K | 115 W/m·K | Aluminum |
| Cost per kg | ~$6 | ~$7 | Aluminum |
| Corrosion Resistance | Excellent | Good | Aluminum |
Which Material Should You Choose?
Choose Aluminum 6061-T6 when:
- Weight-critical applications
- Structural components
- Heat sinks (better thermal performance)
- Large parts where weight adds up
- Anodized finish desired
Choose Brass C360 (Free-Cutting Brass) when:
- Fittings and connectors
- High-volume screw machine parts
- Decorative or luxury hardware
- Electrical terminals
- Plumbing components
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