As Machined Surface Finish Service

As-machined finish provides a clean, functional surface with visible tool marks, offering a cost-effective solution for most CNC machined parts.

Our Anodizing Surface Finishing Services

Our as-machined surface finish service provides a clean and functional finish directly from CNC machining without additional processing. While tool marks may be visible, we control surface roughness (typically Ra 0.8–3.2 μm) to ensure consistent quality and performance. It is a cost-effective solution ideal for parts where appearance is not critical.

What Is an “As Machined” Finish?

An as machined surface is the natural finish obtained directly from CNC machining operations, such as milling or turning, without any post-polishing or surface treatment.
It retains the fine tool marks produced during the cutting process, reflecting high manufacturing accuracy and efficiency.

Key Features:

  • Achieved directly from machining — no extra finishing required

  • Typical surface roughness: Ra 1.6–3.2 μm

  • Preserves dimensional accuracy and sharp edges

  • Ideal for functional prototypes, test fixtures, and precision mechanical parts

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Advantages of As Machined Finish

Cost-Effective

No additional processing reduces overall production cost

Dimensional Accuracy

No added coating thickness ensures precise tolerances

Fast Turnaround

Eliminates secondary finishing steps for quicker delivery

Functional Surface

Suitable for most engineering and mechanical applications

Surface Roughness Reference

Finish Type Process Typical Ra (μm) Appearance
As Machined CNC Milling / Turning Ra 1.6–3.2 Fine tool marks visible, metallic shine
Fine Machined Optimized feed & speed Ra 0.8–1.6 Smooth, semi-gloss
Polished Manual or mechanical polishing Ra ≤ 0.4 Mirror-like reflective surface

As Machined

Ra 1.6–3.2

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Fine Machined

Ra 0.8–1.6

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Polished

Ra ≤ 0.4

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Materials for as machined finish

Our as machined finish can be applied to a wide range of metals and plastics:

  • Metals: Aluminum, Steel, Stainless Steel, Brass, Copper, Titanium

  • Plastics: ABS, POM, Nylon, PC, PEEK, Acrylic

Each material provides a different texture and gloss level after machining — aluminum tends to have a bright metallic look, while stainless steel appears matte gray.

Applications

The as machined finish is commonly used in:

  • Functional prototypes and engineering validation parts

  • Mechanical components and enclosures

  • Fixtures and tooling

  • Industrial automation components

  • Test and measurement devices

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CMS ISO9001 certificate

Quality Assurance

Even without additional finishing, every part undergoes a complete inspection process to ensure accuracy and consistency:

  • Dimensional check with CMM and calipers

  • Surface roughness test (Ra)

  • Visual inspection for tool marks and burrs

  • Optional deburring and edge chamfering

Case Studies

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Frequently  Questions

If you have any questions in the process of product design and manufacturing, you can contact us to obtain expert support and provide the best solution for your product. Get support now ！

It refers to a part delivered directly after CNC machining without any additional surface treatment. Tool marks may remain visible, but all dimensions and functional surfaces meet the specified tolerances.

Typical roughness ranges between Ra 1.6–3.2 μm, depending on tool type, feed rate, and material. Finer machining can achieve Ra 0.8 μm for critical surfaces.

Yes, light tool paths or minor machining marks are normal. If a smoother cosmetic surface is required, additional finishing such as bead blasting, polishing, or anodizing is recommended.

No. Materials like aluminum, steel, and brass may oxidize over time. For better corrosion resistance, coatings such as anodizing, nickel plating, or powder coating should be applied.

Yes. As-machined components often achieve the highest dimensional accuracy since no post-processing affects tolerances. Ideal for prototypes, internal parts, or functional assemblies.

All CNC machinable materials, including aluminum, stainless steel, steel alloys, brass, copper, titanium, and engineering plastics.

Absolutely. Most secondary finish options — anodizing, plating, bead blasting, polishing, coating — can be applied to as-machined parts whenever required.

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Our engineering team will recommend the best surface solution for your parts based on material, function, and appearance requirements.