Metals for CNC Machining
2026-02-07
Common metals for CNC machining include aluminum (6061, 7075), stainless steel (303, 304, 316), brass, titanium, and mild steel, selected for their strength, durability, and conductivity. Aluminum is preferred for rapid, cost-effective machining and lightweight, high-strength parts, while stainless steel is chosen for corrosion resistance and strength.
- Aluminum: Highly machinable, lightweight, and corrosion-resistant. Common alloys include 6061 (versatile, general-purpose) and 7075 (high-strength, aerospace).
- Stainless Steel: Known for high strength and corrosion resistance. 303 is easy to machine, 304 is standard with good, and 316 is for high corrosion resistance, often used in medical/marine applications.
- Brass: Excellent machinability and self-lubricating properties, reducing friction and wear on tools, suitable for electrical components.
- Titanium: Known for high strength-to-weight ratio and biocompatibility, ideal for medical implants and aerospace.
- Steel/Alloy Steel: Offers high toughness, strength, and wear resistance for structural components.
- Copper: Highly conductive for electronics, but tricky to machine as it is soft and gums up tools.
Selection Factors
- Machinability: Softer metals like aluminum and brass allow faster, cheaper cutting.
- Strength & Durability: Titanium and steel are preferred for heavy-duty applications.
- Environment: Stainless steel resists corrosion, whereas carbon steel may require coatings.
- Conductivity: Copper and brass are ideal for electrical parts.
For prototyping and production, popular choices are often 6061 aluminum for speed and 304 stainless for durability.
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