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Our surface finishes standards for CNC machining

Written by Tess Roberts



For all our CNC machined parts we produce, we have certain standards we ensure for our deburring and primary surface finishes which include smooth machining, bead blasting, brushing, polishing, and brushed and electropolished. These standards are listed below so you know what to expect when you order CNC machined parts from Hubs.

For an overview of CNC machining finishes and their pros and cons, check out this article →

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Deburring comes as a standard for all parts machined through Hubs regardless of the surface finish.

Standard option:

You can request these options in the ‘Additional Comments’ section when you build a quote.

Smooth machining (1.6 Ra μm/63 Ra μin)

Smooth machined part in Stainless Steel 304


Ideal application: Smooth machining is best for precise parts where the surface roughness needs to be fine, but is not suitable for customer-facing products. For finished and/or customer-facing products, some kind of primary finish is needed, such as polishing, brushing, followed by a secondary finish, such as anodizing, plating, polishing, etc.

Bead blasting

Bead blasted part in Aluminum 6061


Tolerance limitations:

Ideal application:

Bead blasting creates a satin, textured finish. It’s best for parts where you want to hide machine marks and fingerprint marks and avoid reflective surfaces. The textured surface can also help to increase grip.

Brushing (1.2 Ra μm/47 Ra μin)

Brushed part in Stainless Steel 304


Brushing is mostly used for aesthetic purposes and can be used to cover up imperfections from machining for customer-facing parts.

Brushed and electropolished (0.8 Ra μm/32 Ra μin)

Brushed and electropolished part in Stainless Steel 304


Brushed and electropolished creates a clean surface, best for parts that need to be smooth at a microscopic level.

Additional resources: