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Choosing the Right Finish for Your CNC Parts

From raw CNC machined parts to a final product that gleams with quality involves a crucial decision – selecting the right surface finish or treatment. Choosing the right surface finish or treatment for your CNC parts is an important decision that can affect the quality, performance, and appearance of your final product. Surface finish and surface finishing are two related but distinct concepts that you need to understand before selecting the best option for your application and CNC parts.


The Principle and Roles of Surface Finish and Surface Finishing

Achieving the perfect balance between functionality and aesthetics is a paramount objective. This delicate equilibrium hinges on two intertwined concepts: surface finish and surface finishing.

Surface Finish

Surface finish refers to the intricate micro-level characteristics of a CNC machined part's surface. These characteristics encompass elements like texture, roughness, and overall appearance. When parts are produced from CNC machining, they often sport an "as-milled" surface finish. This means that, despite their precision in shape and dimensions, minor tool marks may still be visible, and the part may exhibit a smooth or even shiny appearance.

Surface Finishing

On the other hand, surface finishing is the array of processes that step in to enhance or safeguard the properties and appearance of a CNC machined part's surface. They can involve adding or removing material, creating unique textures, applying protective coatings, and even altering the color or reflectivity of the part. Surface finishing is the gateway to enhancing corrosion resistance, wear resistance, hardness, electrical conductivity, or simply the visual allure of the component.

The Role of Surface Finish and Surface Finishing

At their core, they address specific functional requirements, such as reducing friction, preventing corrosion, enhancing electrical conductivity, and improving overall durability. By doing so, they ensure that CNC parts can seamlessly meet the demands of their intended applications.

For instance, when it comes to reducing friction, a well-chosen surface finish can transform a rough and abrasive surface into a smooth, gliding one. This is especially important for parts like bearings and gears, where minimizing friction is vital to efficient operation.

Preventing corrosion is another critical function of surface finishes. CNC machining parts exposed to harsh environments or moisture can suffer from rust and degradation. Surface finishing techniques like anodizing or electroless nickel plating create protective barriers, shielding the parts from corrosion and extending their lifespan.

Electrical conductivity is a key consideration for parts used in electrical systems. Surface finishes like gold or silver plating are chosen for their ability to enhance conductivity, ensuring that electrical connections remain reliable.

Visual aesthetics, though not the primary function, also plays a role. An appealing surface finish can enhance the overall appearance of CNC parts.


The Suitable Finish for Your CNC Machine Parts

Surface finish is not just about aesthetics; it directly affects the performance and longevity of CNC parts, especially those in contact with other components such as bearings, gears, or seals.

Bead Blasting

Bead blasting is a versatile process where small glass beads are propelled with precision against the surface of CNC machining parts, resulting in a unique and desirable texture, as well as a matte finish. It provides a tactile quality to the part, making it easier to grip or handle, which can be essential in applications where precision and control are critical. The matte finish achieved through bead blasting reduces glare and reflections, making the part more suitable for environments with specific lighting or visibility requirements. One of the primary advantages of bead blasting is its ability to eliminate imperfections that may be present on the part's surface. Tool marks, burrs, and scratches, which are often unavoidable during the CNC machining process, can be effectively removed through bead blasting.

In terms of cost considerations, bead blasting can be an economical choice compared to some other finishing methods, especially when you need to balance functionality and aesthetics within a budget.


Anodizing is a favored finishing choice, particularly for aluminum CNC machined parts. One of the primary advantage of anodizing is its capacity to significantly improve corrosion resistance. When aluminum parts are exposed to harsh environments, they are susceptible to corrosion, which can compromise their functionality and longevity. Anodizing forms a protective oxide layer on the surface of the aluminum, acting as a barrier against corrosive agents.

Wear resistance is another advantages of anodizing. In applications where CNC parts are subjected to friction, abrasion, or constant wear and tear, anodizing provides an extra layer of defense. The hardened surface created during the anodizing process makes the part more resilient, reducing the likelihood of premature wear and ensuring consistent performance over time.


Powder Coating

The CNC powder coating technique involves the meticulous application of powdered paint, which is expertly sprayed onto the surface of the CNC part. The most striking advantage of powder coating is the durability it imparts to CNC parts. Unlike conventional painting methods, where the paint layer may be susceptible to chipping, peeling, or fading over time, powder coating forms a robust and resilient barrier.

Powder coating also excels in protecting CNC machined parts against the insidious forces of corrosion. The baked-on paint layer creates an impermeable shield that effectively repels moisture, preventing rust and corrosion from taking root.

Chem-film (Conversion Coating)

Chem-film, also commonly referred to as conversion coating, this method involves applying a thin but highly effective layer of chromate or phosphate onto the surface of the part. It is particularly suitable for aluminum or steel CNC parts. It has advantages such as corrosion resistance, electrical conductivity, paint adhesion, etc.

Electroless Nickel Plating

Electroless nickel plating is a chemical process that deposits a layer of nickel-phosphorus alloy onto the CNC part's surface without the use of electricity. This method improves wear resistance, corrosion resistance, hardness, and uniformity of the part. It can even be applied to non-metallic materials like plastics or ceramics, offering versatility in CNC part finishing.

Gold or Silver Plating

One of the great features of gold or silver plating is to enhance its aesthetics. It uses electricity to apply thin layers of these precious metals to the surface of the CNC part. This not only enhances the conductivity of the part but also improves solderability and adds an attractive aesthetic. At the same time, gold and silver plating prevents oxidation and tarnish, ensuring longevity of part performance and appearance.


Custom Finishes: Tailored to Your Needs

When it comes to achieving the perfect finish for your CNC machined parts, sometimes standard options may not entirely align with your specific requirements. In such cases, turning to custom finishes is the ideal solution, allowing you to fine-tune your CNC parts to match your unique preferences and functional demands. Companies like Richconn, a prominent CNC machining specialist, can offer a range of custom finishing services tailored to meet your exact needs.

1. Custom Texture and Surface Finish

Richconn understands that the texture and surface finish of your CNC parts can significantly impact both functionality and aesthetics. Whether you require a matte or glossy finish, or a textured or smooth surface, their skilled technicians can cater to your precise specifications. For more information on CNC finishes, visit CNC machining surface finish and CNC finishes and coatings.

2. Color Customization

Your CNC parts' appearance matters. With a broad palette of colors at Richconn's disposal, they can accommodate your specific color scheme preferences, ensuring that your parts not only perform flawlessly but also look impressive. One popular finish option is the electrophoresis finish, which can provide vibrant and durable coloration.

3. Pattern Design

Richconn's expertise extends to pattern design, enabling them to create intricate patterns or designs on your CNC parts, adding a unique touch that sets your components apart from the rest.

4. Material Compatibility

Richconn's experience in CNC machining and finishing encompasses a wide range of materials, including metals like aluminum, steel, and titanium. This expertise ensures that your custom finishes are not limited by material constraints. They also offer a selection of cheap CNC materials for cost-effective production without compromising quality.

5. Consultation and Collaboration

Richconn values collaboration with their clients. They take the time to understand your unique requirements, offering expert advice about CNC parts online, and guidance to help you choose the right custom finish that aligns with your project's goals and objectives. For specialized treatments like blackening surface treatment, their team is ready to assist.

The perfect finish for your CNC parts online is here!!



The role of surface finish and surface finishing extends beyond aesthetics; they are essential in enhancing functionality, protecting against corrosion, improving wear resistance, ensuring electrical conductivity, and ultimately extending the lifespan of CNC parts. From the versatile bead blasting to the protective anodizing, durable powder coating, versatile chem-film, and the aesthetic appeal of gold or silver plating, there's a finish tailored to every need. And when standards fall short, custom finishes, as offered by companies like Richconn, come to the rescue, allowing you to fine-tune every aspect of your CNC parts to perfection!

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