What is Aluminum?
Aluminum is a lightweight, silvery metal that combines low density with good strength, excellent corrosion resistance and outstanding machinability. It is the most popular material for CNC machining because it cuts quickly, holds tight tolerances and accepts a wide range of surface finishes.
Properties & Benefits
- Lightweight — about one-third the weight of steel.
- Corrosion Resistant — forms a natural protective oxide layer.
- Highly Machinable — fast cycle times and fine detail.
- Thermal & Electrical Conductive — ideal for heat sinks and enclosures.
- Recyclable — sustainable and cost-effective.
Common Aluminum Grades
| Grade | Characteristics | Typical Use |
|---|---|---|
| 6061 | Balanced strength, weldable | Frames, brackets, automotive |
| 6063 | Good finish, extrudable | Profiles, architectural |
| 7075 | Very high strength | Aerospace, tooling |
| 5052 | Corrosion resistant, formable | Sheet metal, enclosures |
| 2024 | High strength aerospace alloy | Aircraft structures |
Machining Processes
Aluminum is suitable for CNC milling and turning, sheet metal fabrication and die casting. Its high machinability supports tight tolerances of ±0.005–0.02mm.
Surface Finishing
- Anodizing (clear, black or colored)
- Bead blasting
- Powder coating and painting
- Polishing and brushing
Applications
Aluminum is used in consumer electronics housings, automotive brackets, aerospace components, robotics frames and heat sinks.
Frequently Asked Questions
Which aluminum grade is most machinable?
6061 offers the best overall balance of machinability, strength and cost.
Can aluminum replace steel?
In weight-sensitive applications yes; 7075 and 2024 approach the strength of some steels at a third of the weight.
What finishes are available?
Anodizing, bead blasting, powder coating, polishing and brushing.
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