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

PropertyAluminum 6061-T6Brass C360 (Free-Cutting Brass)
Tensile Strength310 MPa (45 ksi)385 MPa (56 ksi)
Yield Strength276 MPa (40 ksi)310 MPa (45 ksi)
Hardness95 HB (Brinell)78 HRB
Density2.70 g/cm³8.49 g/cm³
Machinability Rating90/100100/100
Thermal Conductivity167 W/m·K115 W/m·K
Melting Point582–652 °C885–900 °C
Tolerance±0.005 mm±0.005 mm

Key Differences

PropertyAluminum 6061-T6Brass C360 (Free-Cutting Brass)Winner
Weight (Density)2.70 g/cm³8.49 g/cm³Aluminum
Machinability90/100100/100Brass
Tensile Strength310 MPa385 MPaBrass
Thermal Conductivity167 W/m·K115 W/m·KAluminum
Cost per kg~$6~$7Aluminum
Corrosion ResistanceExcellentGoodAluminum

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
View Details Aluminum 6061-T6

Choose Brass C360 (Free-Cutting Brass) when:

  • Fittings and connectors
  • High-volume screw machine parts
  • Decorative or luxury hardware
  • Electrical terminals
  • Plumbing components
View Details Brass C360 (Free-Cutting Brass)

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