Common Metals for CNC Machining

Each metal has unique properties that make it suitable for different applications. Here is a detailed comparison of the most popular choices.

Aluminum 6061

• Pros: Lightweight, excellent machinability, good corrosion resistance, cost-effective
• Cons: Lower strength than steel
• Best for: Prototypes, enclosures, brackets, automotive parts, consumer electronics

Aluminum 7075

• Pros: High strength-to-weight ratio, good fatigue resistance
• Cons: More expensive, less corrosion resistant than 6061 (can be anodized)
• Best for: Aerospace components, high-stress parts, bicycle frames

Stainless Steel 304

• Pros: Excellent corrosion resistance, good formability, food-safe
• Cons: Harder to machine than aluminum, more expensive
• Best for: Food processing equipment, medical devices, marine hardware

Stainless Steel 316

• Pros: Superior corrosion resistance (especially against chlorides), high temperature tolerance
• Cons: Higher cost, tougher to machine
• Best for: Chemical processing, marine environments, pharmaceutical equipment

Brass

• Pros: Excellent machinability, good electrical conductivity, attractive gold appearance
• Cons: Softer, lower strength
• Best for: Fittings, valves, electrical connectors, decorative parts

Copper

• Pros: Best electrical and thermal conductivity, antimicrobial properties
• Cons: Very soft, difficult to machine precisely, prone to oxidation
• Best for: Electrical components, heat exchangers, busbars

Titanium

• Pros: Extremely high strength-to-weight ratio, biocompatible, corrosion resistant
• Cons: Very expensive, difficult to machine
• Best for: Aerospace, medical implants, high-performance racing parts