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Finishing & Surface Treatment Options
Here are the surface finishes and post-processing services available for CNC machined parts. These options help improve durability, appearance, and functionality, while adding more value to your products. If you need something not listed, just contact us.
Functional Finishes
Improve durability, wear resistance, and corrosion protection.
- As machined
- Hard anodizing (Type III)
- Black oxide
- Chromate conversion
- Electroless nickel plating
- Powder coating
Cosmetic Finishes
Enhance the look and feel of your parts.
- Anodizing (Type II, colors optional)
- Bead blasting
- Brushing
- Polishing
Post-Processing Services
Add functionality & completeness
- Thread tapping
- Threaded inserts
- Secondary machining
- Basic assembly
- Part marking
- Inspection reports
Finishing Options in Detail
Here are the common CNC surface finishing and post-processing services for machined parts, with brief explanations.
| Surface Finishes | Description |
|---|---|
| As Machined | Standard CNC delivery, visible tool marks, best for functional parts. |
| Anodizing (Type II) | Corrosion resistance, decorative colors (black, red, blue, gold), for aluminum. |
| Hard Anodizing (Type III) | Thicker, harder anodic layer, excellent wear resistance for aluminum. |
| Powder Coating | Thick, durable protective layer, used on aluminum and steel. |
| Polishing | Mirror-like or smooth finish, common for aluminum and stainless steel. |
| Bead Blasting | Creates uniform matte surface, removes tool marks, popular for housings. |
| Brushing | Linear satin finish, widely used for aluminum panels and stainless steel covers. |
| Black Oxide | Protective conversion coating for steel, improves corrosion resistance. |
| Chromate Conversion (Alodine) | Corrosion resistance for aluminum, common in aerospace/electronics. |
| Electroless Nickel Plating | Wear & corrosion resistance, suitable for aluminum and steel. |
| Post-Processing Services | Description |
|---|---|
| Thread Tapping | Produces internal threads for screws/bolts. |
| Threaded Inserts | Adds durable metal threads in aluminum or plastics. |
| Secondary Machining | Extra drilling, slotting, or chamfering after main machining. |
| Basic Assembly | Simple sub-assemblies before shipping. |
| Part Marking | Laser logo, part reference or serial number marking. |
| Inspection Reports | Dimensional & quality inspection documentation. |
Consistency & Quality Assurance
We don’t just machine your parts — we make sure they look and perform exactly as expected. Every surface is checked under strict cosmetic and inspection standards before shipping.
| Criteria | Our Standard |
|---|---|
| Cosmetic Quality | No scratches or stains on visible areas; color and texture kept consistent across batches. |
| Inspection Conditions | Checked under 650–800 lux lighting, 30–40 cm viewing distance, within 45° angle. |
| A-side Surfaces | Critical visible surfaces — flawless, guaranteed free from defects. |
| B-side Surfaces | Non-visible/functional areas — minor tool marks allowed, never affecting fit or performance. |
Frequently Asked Questions
Which finish is best for outdoor use?
Anodizing (Type II/III) and powder coating are most recommended for outdoor environments. They provide strong corrosion resistance and weather protection.
Can you provide cosmetic color matching?
Yes. We offer anodizing in multiple colors (black, red, blue, gold, etc.) and powder coating with custom color options based on RAL or Pantone references.
Do finishes affect tolerances?
Most surface finishes do not affect critical tolerances. For tight-fit areas, we mask or protect them during finishing to ensure dimensional accuracy.
Do you offer inspection reports for finished parts?
Yes. Dimensional inspection reports, material certifications, and cosmetic checks are available upon request.
Can I combine multiple finishes on one part?
In some cases, yes. For example, bead blasting before anodizing is common. Please contact us for custom finishing combinations.
