Surface Finishes for CNC Machining

CNC machining delivers tight tolerances and high precision, but tool marks are often visible. To enhance appearance, durability, and performance, several post-processing finishes are available. Below is a quick guide to help you choose the right one for your project.

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As Machined

Standard machined parts show minor tool marks. Surface roughness Ra: 3.2 μm (can be reduced to 0.4 μm with extra processing).

• ✅ Tightest dimensional tolerances
• ⚠️ Visible tool marks

Bead Blasting

Creates a matte, satin-like finish by bombarding the surface with glass beads. Best for visual improvement.

• ✅ Uniform matte look
• ✅ Low cost
• ⚠️ May affect dimensions

Anodizing (Type II & III)

Adds a ceramic oxide layer for corrosion and wear resistance. Can be dyed in various colors.

• ✅ Decorative colors (Type II)
• ✅ High hardness & wear resistance (Type III)
• ⚠️ Only for Aluminum & Titanium
• ⚠️ Higher cost for Type III

Powder Coating

Polymer powder coating cured at high temperature. Provides strong protection and color options.

• ✅ Wear & corrosion resistant
• ✅ Wide range of colors
• ⚠️ Less dimensional control
• ⚠️ Not ideal for small parts

Rules of Thumb

• Use As Machined for high tolerance, functional parts
• Use Bead Blasting for matte appearance
• Use Anodizing for corrosion resistance & colors
• Use Powder Coating for strong impact resistance

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