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Surface Finishing Service

Our surface finishing capabilities

Use 3D Hubs as your one-stop solution for both manufacturing and surface finishing of your custom CNC machined parts, reducing the risk of production.

Do you need lettering logos or custom tags? Take a look at our part marking service here.

Choose the right finish for your material

Different surface finishes can be applied to different materials. Find below a quick cheat sheet of surface finish and material compatibility.

Name Material compatibility Rough price increase*
Smooth machining (1.6 Ra μm/64 Ra μin) All plastics and metals +5%
Bead blasting All metals +5%
Powder coating All metals +15%
Bead blasting + Anodizing (type II) Aluminum alloys +15%
Brushing + Anodizing (type II) Aluminum alloys +20%
Anodizing hardcoat (type III) Aluminum alloys +20%
Electropolishing Stainless steel +15%
Black oxide Steels +10%
Chromate conversion coating Aluminum alloys +10%
Brushing All metals +10%
Polishing All metals +30%

*Price increase estimates are based on one-off parts. Bulk pricing also applies to surface finishes.

Our standard surface finishes

Here is a list of standard surface finishes. For custom surface finishes such as electroplating or polishing, please contact sales@3dhubs.com.

As machined

Our standard finish is “as machined” finish. It has a surface roughness of 3.2 μm (126 μin). All sharp edges are removed and parts are deburred. Tool marks are visible.

Smooth machining (1.6 Ra μm/64 Ra μin)

A finishing CNC machining operation can be applied to the part to reduce its surface roughness. The standard smoothing surface roughness (Ra) is 1.6 μm (64 μin). Machine marks are less evident but still visible.

Bead blasted

Bead blasting adds a uniform matte or satin surface finish on a machined part, removing the tool marks. This is used mainly for visual purposes and comes in several different grits which indicate the size of the bombarding pellets. Our standard grit is #120.

Requirement Specification
Grit #120
Color Uniform matte of raw material color
Part masking Indicate masking requirements in technical drawing

Bead blasted + Anodizing type II (Matte)

Parts are bead blasted to #120 grit and then anodized (type II). Ideal for increasing the corrosion resistance of the part. Results in naturally matte colours. For glossy colours, please select the brushed anodizing option.

Requirement Specification
Surface preparation Bead blasted with glass beads grit #120
Tolerances General dimensional tolerances apply after anodizing
Thickness 4 - 8 μm (clear), 8 - 12 μm (color)
Gloss Units 2 - 10 GU
Color Black, clear or any RAL code or Pantone number
Part masking Indicate masking requirements in technical drawing

Brushed + Anodizing type II (Glossy)

Parts are brushed and then anodized type II. Ideal for increasing the corrosion resistance of the part. Typically results in a glossy color.

Requirement Specification
Surface preparation Brushed with grit #400
Tolerances General dimensional tolerances apply after anodizing
Thickness 4 - 8 μm (clear), 8 - 12 μm (color)
Gloss Units 10 - 60 GU
Color black, clear or any RAL code or Pantone number
Part masking Indicate masking requirements in technical drawing

Anodized type III (Hardcoat)

The anodizing type III coating is applied directly to a surface as machined (no other mechanical finish applied). Type III anodizing provides excellent corrosion and wear resistance, suitable for functional applications.

Requirement Specification
Surface preparation "As machined", cleaned and de-greased
Tolerances General dimensional tolerances met before anodizing
Thickness 35-50 μm
Color Black or natural
Part masking Indicate masking requirements in technical drawing

Powder coating

Powder coating is a strong, wear-resistant finish that is compatible with all metal materials.

Requirement Specification
Tolerances Met before process
Thickness 50-150μm
Color Black or any RAL code or Pantone number
Part masking Indicate masking requirements in technical drawing.

Brushed + Electropolished (Ra0.8µm, 32µin)

Electropolishing is an electrochemical process used to clean metallic surfaces and reduce micro-roughness of stainless steel parts. Useful to remove a thin (up to 10μm) layer of material and improve surface finish.

Requirement Specification
Surface preparation Brushed
Color Natural metal color
Part masking Indicate masking requirements in technical drawing

Black oxide

Applicable on steels, black oxide is a Conversion coating used to improve corrosion resistance and minimize light reflection.

Requirement Specification
Surface preparation "As machined", cleaned and de-greased
Thickness 0-30μm
Color Black.
Part masking Indicate masking requirements in technical drawing

Chromate conversion coating (Alodine/Chemfilm)

Chromate conversion coating is used to increase the corrosion resistance of aluminium and aluminium alloys while maintaining their conductive properties.

Requirement Specification
Surface preparation "As machined", cleaned and de-greased
Color Clear
Part masking Indicate masking requirements in technical drawing

Brushing

Brushing is produced by polishing the metal with grit resulting in a unidirectional satin finish. Not advisable for applications where corrosion resistance is required.

Requirement Specification
Surface roughness Ra 1.2μm / Ra 47μm
Grit #400-600
Part masking Indicate masking requirements in technical drawing

Polishing

Parts are manually polished in multiple directions. Surface is smooth and slightly reflective.

Requirement Specification
Surface roughness Ra 0.8μm / Ra 32μm
Part masking Indicate masking requirements in technical drawing
Matt Farr, UK Strategic Account Manager Alex Vermolen Director of Sales EMEA
Jennifer Kaari, US Strategic Account Manager Jennifer Kaari US Strategic Account Manager
David Nguyen, EMEA Sales Engineer David Nguyen EMEA Sales Engineer

For businesses of all sizes

Get in touch with our team to access these services:

  • Add 3D Hubs as a vendor
  • ISO 9001, material certifications, test reports and full dimensional reports
  • Non-disclosure agreements
  • Urethane casting and part marking
  • Sample verification program (learn more)
  • Dedicated account manager

Call us directly on , or email us at sales@3dhubs.com

Get your parts machined and finished in as fast as 5 days

Upload your designs, select your material and surface finish and get your parts into production in less than 5 minutes.

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