Aluminum CNC Machining Service

Expert processing of high-strength Aluminum Wrought & Cast alloys with exceptionally tight tolerances. Delivering quality, lightweight components for aerospace, automotive, and industrial systems worldwide.
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Composite of High-Precision CNC Machined Aluminum Parts with Various Finishes (Anodized, Raw Metal, Colored)
High-Precision CNC Milled Aluminum Hydraulic Manifold with Multiple Threaded Ports

Aluminum CNC Machining

Aluminum CNC machining provides lightweight yet rigid components with excellent corrosion resistance and precise dimensional control. By combining high-strength alloys with optimized toolpaths, it enables complex geometries, tight tolerances, and fine surface finishes suitable for industrial equipment, automotive systems, aerospace structures, and electronic enclosures.
Price: Inquire
Lead Time: Within 7-15 Days
Wall Thickness: 0.8 mm
Tolerance: ±0.01 mm (±0.0004 in)
Max Part Size: 200 × 80 × 100 mm
MinHe Available Aluminum Grades: 6061, 2024, 5052, 5083, 6061-T6, 6063, 6082, 7075, 7075-T6, 319, A356, A413, AlSi9Cu3, ADC12 (A380/LM25)

Aluminum 6061

As the most common heat-treatable wrought aluminum alloy, 6061 dominates machining orders globally. It features an excellent strength-to-weight ratio, good corrosion resistance, and superb weldability. We specialize in transforming 6061 bar stock, plates, and extrusions via CNC machining into high-precision, reliable parts for aerospace, medical, and automotive applications.

Tensile Strength, Yield (MPa) Fatigue Strength (MPa) Elongation at Break (%) Hardness (Brinell) Density (g/cm³)
310 96 12 95 2.70

Aluminum 319

Alloy 319 is a versatile, general-purpose casting aluminum alloy, widely favored for its excellent castability and superior machinability. Used heavily in automotive engine blocks, oil pans, and gearbox housings, it offers a solid balance of strength and ductility for high-volume applications where cost efficiency is a major factor.

Tensile Strength, Yield (MPa) Fatigue Strength (MPa) Elongation at Break (%) Hardness (Brinell) Density (g/cm³)
186 N/A 1.5 80 2.77

Aluminum LM25

LM25 (equivalent to A356) is a prime choice for British and ISO projects requiring high integrity and superior corrosion resistance. Often used in complex investment and permanent mold castings, its T6 condition provides the necessary strength for structural components in marine and aerospace equipment.

Tensile Strength, Yield (MPa) Fatigue Strength (MPa) Elongation at Break (%) Hardness (Brinell) Density (g/cm³)
230 N/A 3.0 75-85 2.68

Aluminum A356

A356 is the preferred high-strength aluminum casting alloy in aerospace, high-performance automotive, and heavy-duty instrumentation sectors. The T6 heat treatment enhances its high yield strength and notable ductility, making it ideal for critical structural components. We specialize in the precision machining of complex A356 geometries.

Tensile Strength, Yield (MPa) Fatigue Strength (MPa) Elongation at Break (%) Hardness (Brinell) Density (g/cm³)
276 96 3.5 95 2.68

Aluminum A413

A413 is distinguished by its high silicon content, which grants it outstanding resistance to wear, exceptional fluidity during casting, and superior pressure tightness. It is typically specified for pumps, hydraulic components, and housings that must withstand high internal pressures and abrasion.

Tensile Strength, Yield (MPa) Fatigue Strength (MPa) Elongation at Break (%) Hardness (Brinell) Density (g/cm³)
310 N/A 0.5 100 2.72

Aluminum AlSi9Cu3

AlSi9Cu3 is a European DIN/EN standard alloy, widely utilized in continental automotive and machinery projects. It is a workhorse alloy, valued for its good mechanical properties, excellent castability, and balance of strength and durability, especially when heat-treated. We specialize in the precise CNC milling and turning of AlSi9Cu3 components to meet strict European tolerance standards.

Tensile Strength, Yield (MPa) Fatigue Strength (MPa) Elongation at Break (%) Hardness (Brinell) Density (g/cm³)
320 N/A 1.0 90 2.75

Aluminum A380

A380 is the industry standard for die-casting aluminum and is the most widely used and cost-effective alloy for the US market. It offers an ideal balance of excellent fluidity, high pressure tightness, and reliable mechanical properties. Our high-volume CNC setup is optimized for the efficient and precise secondary machining of A380 castings, commonly used in automotive, electronic housings, and structural parts.

Tensile Strength, Yield (MPa) Fatigue Strength (MPa) Elongation at Break (%) Hardness (Brinell) Density (g/cm³)
324 N/A 1.8 95-105 2.70

Aluminum Precision CNC Components

5-Axis CNC Machined Aluminum Compressor Blade for Aerospace and Turbine Applications

Compressor Blade

High-Precision CNC Machined Aluminum Wheel Hub for Automotive

Wheel Hub

High-Precision CNC Machined Aluminum Pressure Flange for Sealing

Pressure Flange

CNC Machined Aluminum Quick-Connect Coupling with Thread and Locking Mechanism

Quick-Connect Coupling

High-Tolerance CNC Turned Aluminum Control Shaft with Multiple Steps and Keyway

Control Shaft

High-Precision CNC Milled Aluminum Sensor Mounting Support Bracket

Sensor Mounting Support

Surface Finishes for Aluminum Components

The right surface treatment is crucial for maximizing the performance of your aluminum parts. Our finishing capabilities go beyond standard CNC milling and turning, providing essential protection against corrosion, wear, and abrasion. We offer a comprehensive range of functional and aesthetic finishes—from Type III Hard Anodizing to specialized Chem Film—ensuring your components meet strict requirements for strength, conductivity, and durability in their final application.

Hard Anodized Aluminum Wheel Hub with High Wear Resistance

Hard Anodizing

Hard anodizing creates a dense, wear-resistant aluminum oxide layer significantly thicker and harder than conventional anodizing. This process enhances the aluminum’s hardness, corrosion resistance, and electrical insulation properties, making the surface ideal for highly loaded, moving, or abrasive components.

Standard Anodizing

Standard anodizing provides excellent corrosion resistance and an aesthetically pleasing finish. This electrolytic process allows for the application of vibrant dyes, offering durability and a wide range of color options, perfect for visible external housings, panels, and decorative components.

Yellow Chromate Conversion (Chem Film) on Aluminum Sensor Mounting Bracket

Chromate Conversion

Chem film (Mil-C-5541) applies an extremely thin protective layer, providing superior corrosion resistance while retaining excellent electrical conductivity. This treatment is critical for electrical grounding points and serves as an ideal primer for subsequent paint or powder coat applications.

Black Powder Coated Aluminum Pipe Flange for High Durability and Corrosion Protection

Powder Coating

Powder coating is a highly durable and environmentally friendly finishing option. It creates a thick, tough, protective layer that is highly resistant to impact, corrosion, and UV damage. This process is excellent for large components and parts exposed to harsh outdoor or demanding industrial environments.

Aluminum Control Shaft with Bead Blasted Matte Finish for Surface Uniformity

Bead Blasting

Bead blasting uses fine glass or ceramic beads to create a uniform matte finish, effectively masking tool marks and achieving a consistent aesthetic. This process is also vital as a pre-treatment step, improving the adhesion and uniformity of subsequent coatings like anodizing or painting.

Liquid Painted Aluminum Compressor Blade in Yellow for Custom Aesthetic Finish

Painting

Liquid painting offers the highest flexibility in color and finish (matte, gloss, metallic) for unique aesthetic requirements. This process provides a protective barrier and is often used when specific color matching or application to complex geometry is required.

Pros and Cons of Aluminum Machining

Aluminum remains the most popular material in CNC precision machining, prized for its excellent balance of mechanical, thermal, and electrical properties. Understanding its core characteristics—both its innate advantages and the challenges it presents during high-tolerance processing—is crucial for successful product development and manufacturing.

Pros

  • Lightweight & Strength: Aluminum is one of the lightest metals. Its superior strength-to-weight ratio makes it an ideal choice for aerospace, transportation, and other weight-sensitive applications.
  • High Machinability: It is simple to shape, drill, and form, contributing to highly efficient manufacturing and the creation of complex geometries while minimizing tool wear.
  • Corrosion Resistance: Aluminum naturally forms a stable oxide protective layer. This resistance can be significantly enhanced by treatments like anodizing or chromate conversion.
  • High Conductivity: Aluminum is an excellent conductor of heat and electricity, making it essential for thermal management (heat sinks) and electronic components.
  • Surface Finish Compatibility: Aluminum exhibits excellent adhesion to most surface treatments, including decorative anodizing, functional conversion coatings, and various paint finishes.

Cons

  • High Thermal Expansion: Aluminum's relatively high thermal expansion coefficient means it requires strict temperature control during processing to maintain dimensional accuracy.
  • Softness & Galling: The material's soft nature makes it prone to tool sticking (galling) and scratching, often requiring specialized tooling and optimal lubrication during machining.
  • Hardness Limitation: Pure aluminum's low hardness means high-wear applications must rely on alloys (like 7075) or surface hardening treatments (like hard anodizing).

Applications of Aluminum Components

Aluminum components are critical for diverse industries due to their balanced performance, excellent rigidity, and versatile processing capabilities. They are widely specified for applications requiring critical dimensional accuracy, superior thermal management, and reliable resistance to environmental stress.

  • Aerospace & Defense: Used for manufacturing structural components and brackets, primarily relying on aluminum's high strength-to-weight ratio and ability to meet strict tolerance standards.
  • Automotive & Transportation: Used for lightweight body parts, engine components, and wheel hubs to improve fuel efficiency and vehicle performance.
  • Electronics & Thermal Management: Essential for producing precise heat sinks, control panels, and enclosures to ensure reliable operation and effective heat dissipation.
  • Industrial & Fluid Control: Used for manifolds, pump bodies, and high-pressure connectors that require exceptional flatness, sealing integrity, and corrosion resistance.
High-Precision Aluminum Components with Multiple Finishes: Anodizing, Powder Coating, and Machined Finish

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Frequently Asked Questions (FAQ)

Q: Which aluminum alloy is most commonly requested by US/EU clients?

A: The most frequently requested alloys are 6061-T6 (for general wrought machining due to its excellent strength and versatility) and A380 / A356 (for pressure castings that require precision secondary machining).

Q: What are the typical tightest tolerances you can hold on aluminum parts?

A: While tolerances vary by size and geometry, we routinely hold tolerances of ±0.01mm (±0.0004 in) or better on critical dimensions by implementing strict thermal management and specialized cooling protocols.

Q: We need an aluminum part that is both corrosion-resistant and electrically conductive. What finish do you recommend?

A: We recommend Chromate Conversion Coating (Chem Film, Mil-C-5541). It provides excellent corrosion resistance while ensuring the surface retains superior electrical conductivity, unlike anodizing which is insulative.

Q: Why is the fatigue strength data for casting alloys often not specified?

A: Fatigue strength in casting alloys (like A380) is highly sensitive to internal defects (porosity), causing wide data variance. Design engineers typically rely on our proven process control and a conservative safety factor based on the material's yield strength.