Brass vs Copper for CNC Machining: Properties and Applications
Brass C360 is dramatically easier to machine (100 vs 20 rating) and is the clear choice for complex turned parts. Copper is the choice when maximum electrical/thermal conductivity is the primary requirement.
Side-by-Side Property Comparison
| Property | Brass C360 (Free-Cutting Brass) | Copper C110 (ETP Copper) |
|---|---|---|
| Tensile Strength | 385 MPa (56 ksi) | 220 MPa (32 ksi) |
| Yield Strength | 310 MPa (45 ksi) | 69 MPa (10 ksi) |
| Hardness | 78 HRB | 45 HRF |
| Density | 8.49 g/cm³ | 8.94 g/cm³ |
| Machinability Rating | 100/100 | 20/100 |
| Thermal Conductivity | 115 W/m·K | 388 W/m·K |
| Melting Point | 885–900 °C | 1,083 °C |
| Tolerance | ±0.02 mm | ±0.02 mm |
Key Differences
| Property | Brass C360 (Free-Cutting Brass) | Copper C110 (ETP Copper) | Winner |
|---|---|---|---|
| Machinability | 100/100 | 20/100 | Brass |
| Electrical Conductivity | 26% IACS | 101% IACS | Copper |
| Thermal Conductivity | 115 W/m·K | 388 W/m·K | Copper |
| Tensile Strength | 385 MPa | 220 MPa | Brass |
| Surface Finish Quality | Excellent | Good (gummy) | Brass |
| Cost | ~$3/lb | ~$5/lb | Brass |
Which Material Should You Choose?
Choose Brass C360 (Free-Cutting Brass) when:
- High-volume screw machine parts
- Complex geometries requiring good machinability
- Fittings, connectors, and valve bodies
- Decorative hardware
- Parts with tight tolerances
Choose Copper C110 (ETP Copper) when:
- Maximum electrical conductivity needed
- Heat sinks and thermal management
- Bus bars and grounding components
- RF shielding applications
- Waveguides and electron tubes
Not Sure Which Material to Choose?
Our engineers can recommend the best material for your application. Upload your design for a free consultation.
Get a Free Quote