Hard Anodizing Services for High-Wear Aluminum Parts
Type III Hard Anodizing for Industrial & Precision Applications
We provide professional hard anodizing (Type III anodizing) services for CNC machined aluminum parts that require maximum wear resistance, corrosion protection, and long-term durability.
Hard anodizing is widely used in industrial equipment, aerospace, automotive, robotics, and mechanical systems, where standard anodizing is not sufficient.
By combining precision CNC machining with controlled hard anodizing, we help customers achieve both tight tolerances and superior surface performance.
What Is Hard Anodizing (Type III Anodizing)?
Hard anodizing, also known as Type III anodizing, is an electrochemical surface treatment that creates a thick, dense aluminum oxide layer on the surface of aluminum parts.
Compared to standard (Type II) anodizing, hard anodizing offers:
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Much higher surface hardness
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Excellent abrasion resistance
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Improved corrosion protection
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Longer service life under mechanical stress
The anodic layer becomes an integral part of the aluminum substrate and does not peel or flake.
Key Benefits of Hard Anodizing
Extreme Wear Resistance
Surface hardness can reach HV 400–600, significantly reducing wear and friction.
Superior Corrosion Protection
Ideal for harsh environments, outdoor use, and industrial exposure.
Electrical Insulation
The oxide layer provides excellent electrical insulating properties.
Extended Part Lifespan
Reduces maintenance and replacement costs.
Hard Anodizing vs Standard Anodizing
| Feature | Type II Anodizing | Type III Hard Anodizing |
|---|---|---|
| Coating Thickness | Thin | Thick |
| Surface Hardness | Moderate | Very high |
| Wear Resistance | Medium | Excellent |
| Typical Color | Decorative | Dark gray / black |
| Applications | Cosmetic & light duty | Heavy-duty & industrial |
Applications of Hard Anodized Aluminum
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Industrial machinery components
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Sliding and rotating parts
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Automotive functional components
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Aerospace structural parts
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Robotics and automation systems
Hard anodizing is especially suitable for parts subjected to friction, impact, or repeated mechanical movement.
Design Considerations for Hard Anodizing
When designing parts for hard anodizing, engineers should consider:
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Coating thickness impact on tolerances
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Alloy selection (6061 and 7075 are commonly used)
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Masking of critical dimensions
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Post-anodizing machining requirements
Early DFM review helps avoid dimensional issues.
Why Choose Our Hard Anodizing Services
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Engineering-driven DFM support
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Tight control of coating thickness
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Experience with industrial applications
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Consistent quality for B2B customers
Request a Hard Anodizing Quote
Looking for hard anodized aluminum parts with tight tolerances and long service life?
Send us your drawings today for engineering review and a fast quotation.