Aluminium 6061-T6 is the workhorse of precision CNC machining. Its combination of good strength, excellent corrosion resistance, outstanding machinability, and compatibility with anodising makes it the first choice for engineers across aerospace, automotive, electronics, and robotics. Over 60% of OrangeSea CNC's volume is aluminium — and 6061 is the most common grade we run. Our operators know this material inside out: the right spindle speeds (up to 15,000 RPM), the correct chip-load for thin walls, the fixture strategy that minimises distortion on large plates. If you're specifying a part and aren't sure which alloy to use, 6061-T6 is almost always the right starting point.
Technical Data
Material Properties
Capabilities
Why CNC Machine Al 6061?
Fastest Chip Removal
6061 machines at very high surface speeds with minimal tool wear — lower cost per part than steel at equivalent complexity.
Excellent Surface Finish
Achieves Ra 0.4 µm or better with standard carbide tooling. Mirror finishes (Ra 0.2 µm) achievable with diamond tooling.
Dimensionally Stable
Low thermal expansion and good stiffness mean 6061 holds tight tolerances throughout long machining operations.
Anodising Ready
6061 anodises predictably to Type II (decorative) and Type III (hard anodise) — producing a hard, wear-resistant surface in any colour.
Weldable & Bondable
MIG and TIG weldable for fabricated assemblies. Excellent adhesive bond strength for structural bonding applications.
Wide Availability
6061 is the most stocked aluminium alloy worldwide — we hold large quantities of bar, plate, and tube for rapid turnaround.
Use Cases
What We Machine in Al 6061
Engineering Tips
Design for Machining — Al 6061
Specify T6 temper (not T0 or T4) for machined parts — the age-hardening gives consistent hardness and dimension stability
Wall thickness below 0.5 mm will distort during machining — discuss minimum wall early in design review
Threads in 6061 are strong enough for most applications — specify helical inserts (Helicoil) for high-cycle or heavy-load threaded holes
Hard anodising (Type III) adds approximately 0.025 mm of coating — account for this in bore and shaft dimensions
For cosmetic parts, specify 'machining marks acceptable' or 'cosmetic finish required' — Ra requirements drive cycle time and cost
Surface Options
Available Finishes
Related Materials
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Ready to Machine in Al 6061?
Upload your design files and get a detailed quote within 24 hours. Tolerances to ±0.01 mm, ships worldwide from Shenzhen.