Quick Answer
Aluminum is the most commonly CNC machined material for prototypes and production parts, thanks to its low cost, light weight, and easy machinability. HongYing machines aluminum grades including 6061, 7075, 5052, and 2024, holding tolerances as tight as ±0.005mm, with typical lead times of [2–7 days for prototypes, 2–3 weeks for production] through our verified manufacturing partner network in China.
Which Aluminum Grade Should You Use?
Grade Key Properties Common Applications 6061 Good strength, corrosion resistance, easy to machine General components, brackets, enclosures 7075 High strength, aerospace-grade Structural parts, aerospace, high-stress components 5052 Good corrosion resistance, formable Marine parts, sheet metal-adjacent components 2024 High strength-to-weight, fatigue resistance Aerospace, high-performance structural parts
If you're not sure which grade fits your application, this is exactly what a CAD/DFM review is for — send your drawing and we'll recommend the right grade for your strength, weight, and cost requirements.
Tolerances & Surface Finish
Aluminum is one of the more forgiving materials to hold tight tolerances on, compared to harder metals like titanium or stainless steel — it machines faster and with less tool wear. Standard achievable tolerances:
General tolerance: ±0.1mm
Precision tolerance: ±0.02mm
Tight tolerance (critical features): ±0.005mm
Common finishing options include anodizing (Type II and Type III / hardcoat), bead blasting, and polishing — each quoted separately based on part geometry and coverage area.
Aluminum vs. Other Common CNC Materials
Aluminum is usually the starting point, but not always the right one. Quick comparison:
Aluminum vs. Titanium: Aluminum is significantly cheaper and faster to machine; titanium is used where strength-to-weight or heat resistance requirements exceed what aluminum can offer.
Aluminum vs. Stainless Steel: Aluminum is lighter and cheaper; stainless steel is chosen for higher strength, corrosion resistance in harsher environments, or food/medical grade requirements.
Most projects we run involve a mix — aluminum for housings and brackets, tighter-spec metals like titanium or stainless steel for load-bearing or high-heat components. Material choice depends on the part's actual job, not a default.
Frequently Asked Questions
What's the most cost-effective aluminum grade for CNC machining? 6061 is generally the most cost-effective and widely available grade for general-purpose parts — it machines quickly and holds tolerances well without the added cost of aerospace-grade alloys.
Can aluminum parts be anodized after CNC machining? Yes — anodizing is a common post-machining finish for aluminum, improving corrosion resistance and allowing color options.
Is there a minimum order quantity for aluminum CNC parts? Most of the time no MOQ
Get a Real Quote
Grade selection, tolerance, and finish all affect price and lead time. Upload your CAD file and our engineering team will confirm the right aluminum grade for your application and return a fixed quote.
