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Aluminum 6061-T6
General Purpose Standard
The industry standard for CNC machining. It offers the best balance of strength, corrosion resistance, and weldability. Perfect for structural parts.
Aluminum CNC Machining Services
With 20 years of aluminum CNC machining experience. AT-Machining Empowering Your Designs with Unmatched Accuracy!
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- No Minimum Order
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Save 30% cost on average!
Expert CNC aluminum machining service
AT-Machining delivers fast, reliable CNC aluminum machining for prototypes and production. Our ISO9001-certified shop handles simple to complex designs with precision milling and turning. We support rapid prototyping, small batches, and volume runs. Our engineering team is available 24/7 for expert assistance.
CNC Milling
3 Axis, 4 Axis and 5 Axis CNC Machining Service for simple and complex geometries parts.
CNC Turning
CNC turning with live tools combines lathe and milling capabilities to machine parts with cylindrical features.
Finishes Services
Add multiple finishes to your parts, such as Anodizing, Sand Blast, Powder Coat, Plating, etc.
Aluminum Machining Tolerance Standards
We deliver aluminum parts with exacting precision. Our standard tolerance is ±0.005” (±0.125mm), adhering to ISO 2768-m.
For critical applications requiring superior accuracy, we can achieve tolerances as tight as ±0.001” (±0.025mm). By specifying your requirements on the print, you ensure every component is machined for perfect fit and function.
For critical applications requiring superior accuracy, we can achieve tolerances as tight as ±0.001” (±0.025mm). By specifying your requirements on the print, you ensure every component is machined for perfect fit and function.
Comparison Of Common Aluminum Alloys
| Aluminum Grade | Cost | Ultimate Tensile Strength | Max Operating Temp | Elongation | Hardness | Weldability | Thermal Conductivity | Common Applications |
|---|---|---|---|---|---|---|---|---|
| Aluminum 6061-T6 | $ | 291 - 320 MPa | 130 - 150 °C | 12 - 17 % | 60 HRB | High | 152 - 169 W/(m·°C) | Automotive, Marine, Electrical |
| Aluminum 7075-T6 | $$$ | 434 - 580 MPa | 100 °C | 2 - 11 % | 79-86 HRB | Poor | 131 - 137 W/(m·°C) | Aircraft and aerospace, Marine |
| Aluminum 5083-H111 | $$ | 270 - 350 MPa | 80 - 100 °C | 13 % | 74 HV | High | 118 - 128 W/(m·°C) | Marine industry, Pressure vessels |
| Aluminum 6082 | $ | 140 - 340 MPa | 130 - 150 °C | 6.3 - 18 % | 35-56 HRB | High | 160-180 W/(m·°C) | Structural frames, Pylons |
Note: The above table of aluminum alloy parameters for various grades is for reference only, contact us for more accurate details.
Available Aluminum Alloys for CNC Machining
Common aluminum alloys for CNC milling or turning include 6061, 7075, 6082, and 5083-H111. 6061 offers corrosion resistance and weldability; 7075 boasts high strength; 6082 provides balanced properties with good machinability; and 5083-H111, with exceptional seawater resistance, is perfect for marine and transport applications.
Each alloy has unique benefits that make them well-suited for different CNC machining applications.
Aluminum 7075-T651
Aerospace Grade | Stress Relieved
Strength comparable to steel. The T651 temper is stress-relieved, ensuring superior dimensional stability and minimal distortion during complex machining.
Aluminum 5083-H111
Marine Grade | Chemical Resistant
Known for exceptional performance in extreme environments. Offers the best resistance to seawater and industrial chemicals. Retains high strength after welding.
Aluminum 2024-T8510
High Fatigue Resistance
A primary aerospace alloy chosen for parts subject to high tension or cyclic loading. Offers an excellent strength-to-weight ratio and superior fatigue resistance.
Aluminum 7050-T7451
Thick Plate Specialist
Superior to 7075 in thick sections. The T7451 temper provides a unique combination of high strength, fracture toughness, and stress corrosion cracking resistance.
Aluminum 6082
Structural Alloy
The highest strength alloy of the 6000 series. Ideal for high-stress structural applications (trusses, cranes) with excellent corrosion resistance.
Aluminum 2011
Free Machining Alloy (FMA)
The best machining aluminum alloy. It produces small, broken chips, allowing for high-speed CNC production and tight tolerances on complex parts.
Aluminum 6063
Architectural & Cosmetic
Selected for its excellent response to anodizing and superior surface finish. Ideal for visual parts, architectural frames, and consumer electronics.
AT-Machining
On-demand Aluminum CNC Machining With Custom Finishes.
You Design It, We'll Make It.
You Design It, We'll Make It.
Best Practices For Aluminum CNC Machining
Geometry Fundamentals
Specify realistic minimum wall thickness and fillet radii. Match radii to tool diameters for better stiffness and surface finish.
Stress Management
Control residual stress with strategic roughing. Use symmetric material removal and flip sequencing to minimize warping.
Fixturing Strategy
Provide accessible clamping surfaces and consistent datums. Proper probing targets reduce setup variation and maintain tolerances.
Tooling Selection
Prioritize high-helix end mills and optimized stick-out. Use balanced toolholders to reduce chatter and improve chip evacuation.
ALuminum CNC Machining for Automotive 
Milling 
CNC Milling 
Tolerance 0.005mm 
As Machined CNC Machined Aluminum Applications
Aluminum is lightweight, strong, and versatile. We deliver precision-machined parts for top industries, ensuring durability and performance where it matters most.
Aerospace Industry
Lightweight strength is key. We create precise aircraft parts, like brackets and frames, ensuring safety and fuel savings for every flight.
Automotive & Motorsport
Boost speed and save fuel. We machine light, durable engine and suspension parts built to handle the high stress of racing.
Electronics & Telecommunications
Heat control is essential. We machine custom heat sinks and strong cases to keep sensitive devices cool, protected, and running smoothly.
Medical & Healthcare
Hygiene is non-negotiable. We make rust-resistant surgical tools and device covers that are easy to sterilize and safe for patient use.
Expert Engineering Guide
DFM for Aluminum CNC Machining
Aluminum 6061 and 7075 are versatile but prone to vibration and deformation if not designed correctly. Follow these 5 expert principles to optimize your parts for high-speed machining, reducing costs and lead times.
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01 Optimize Internal Radii
02 Rigid Wall Thickness
03 Limit Cavity Depth
04 Smart Tolerancing
05 Thread Depth Control
Optimize Internal Radii
Don't just add a radius—add a floor radius. Make internal corner radii slightly larger than standard tool sizes (e.g., R3.5mm instead of R3.0mm). This allows the tool to maintain a continuous motion (trochoidal milling), reducing load and improving surface finish.
Maintain Rigid Wall Thickness
Aluminum is prone to vibration and warping due to internal stress release. We recommend a minimum wall thickness of 0.8mm (0.031") for structural stability. Thicker walls allow for more aggressive material removal rates, significantly lowering cycle time.
Limit Cavity Depth
Deep pockets require long, slender end mills that are prone to deflection and chatter. Design cavity depths to be less than 4x the diameter of the smallest internal radius. If deeper features are needed, consider splitting the part or using a larger corner radius.
Smart Tolerancing
Tighter tolerances significantly increase machining time and inspection costs. Apply tight tolerances (e.g., ISO 2768-f) only to critical mating interfaces. For non-critical visual surfaces, standard tolerances (ISO 2768-m) are sufficient and much more cost-effective.
Thread Depth Control
Avoid excessive thread depths. A thread depth of 1.5x to 2x the hole diameter provides maximum strength for aluminum screws. Deeper threads increase the risk of tap breakage and chip packing without adding any structural benefit.
Surface Finishes For CNC Machined Aluminum Parts
Many types of surface finishes can be applied to CNC machined aluminum parts. The most common finishes AT-Machining provides are anodizing, powder coating, bead blast and plating. Each of these finishes has unique benefits. Choose the one best suits your needs!
As machined
The machined aluminum parts are left with visible tool marks and potentially sharp edges and burrs, which can be removed upon request.
Bead Blasted
Give the machined parts a smooth and uniform matte surface finish, thereby removing tool marks.
Polishing
Creating a smooth and shiny surface by manually polishing in multiple directions or by applying a chemical polish treatment.
Anodizing
Type II (Anodizing color or clear) or Type III (Anodizing hard coat) Anodizing does not cover tool marks unless bead blasted beforehand.
Chromate Conversion Coating
Increase the part's corrosion resistance while retaining its conductivity. RoHS compliant.
Decorative Chrome Plating
Enhance aesthetics and durability of the cnc aluminum components.
Powder Coat
Applying powdered paint to the components and then baking it in an oven, which results in a stronger, more wear- and corrosion-resistant layer that is more durable than traditional painting methods.
Gallery Of CNC Machined Aluminum Parts
Our team specializes in rapid prototyping and low & large volume production. We serve medical, aerospace, automotive, and robotics industries with precision components.
Support & FAQ 
Talk to Chief Engineer
Got Questions about Aluminum Machining?
We know precision manufacturing can be complex. Here are the answers to the most common questions our engineering team receives.
Sam
Founder & Chief Engineer
"30 years of CNC experience, dedicated to solving complex design challenges."
Aluminum CNC machining costs depend on part complexity, machining hours, alloy grade, surface finish, and quantity. Simple 6061 parts may cost a few dollars each, while complex 5-axis 7075 components require longer cycles. Bulk orders reduce unit cost significantly.
Typical tolerances for aluminum CNC parts are ±0.01 mm, while critical dimensions can reach ±0.005 mm with optimized setups. High-precision applications often use 4-axis or 5-axis machines to maintain consistency.
Common finishes include anodizing (Type II & Type III), powder coating, bead blasting, brushing, and chromate conversion. Each provides benefits like corrosion resistance or aesthetics to match your specific requirements.
Prototyping usually takes 3–7 days. Production orders often require 10–20 days. Lead times vary by quantity and finishing needs, with expedited services available for urgent deadlines.