Shenzhen Prolean Technology Co., Ltd.

CNC Machining


CNC Milling

Prolean’s CNC milling services focus on manufacturing high-quality complex parts with tight tolerances in quantities ranging from small batches of prototypes to full production runs.

Our best-in-class three-axis and multi-axis CNC mills and a team of skilled professionals with years of experience combine to produce bespoke milled parts out of different materials.

CNC Milling
Quality Assurance

Quality Assurance

Competitive pricing

Competitive Pricing

Timely Delivery

Timely Delivery

High Precision

High Precision

What is CNC Milling?

CNC (Computer Numerical Control) milling is one of the most widely used part manufacturing processed in modern industries.

In CNC milling, a multipoint cutting tool follows computer code to progressively remove material from a clamped workpiece to generate required shapes and contours. Wide range of metals, alloys and plastics can be CNC milled with high precision.

5 axis machine (3)
5 axis machine (4)
Almost all products require CNC milling at some point in their production because of CNC milling’s capability of producing accurate designs. The job of creating high-precision parts is one for state-of-the-art CNC mills.


Quality Assured:

Dimension Reports

On-time Delivery

Material Certificates

Tolerances: +/- 0.05mm or better on request.


3-aixs Milling

3-axis CNC milling is the most common type of milling process used in part manufacturing. Products with simple geometries that only require material removal in three directions are milled on 3-axis CNC mills with stationary tables for raw material and cutting tools that can move in X, Y and Z directions.

Prolean’s 3-axis CNC milling services offer economic prices for precision 3-axis CNC milled parts that all industries require in large numbers.


5-axis Continous CNC Machining

5-axis continuous CNC milling is the most advanced milling process used for manufacturing complex parts. Unlike indexed CNC milling where the extra two axes only change material position between operations, 5-axis continuous milling uses all five axes simultaneously which allows production of the most complex parts including the ones used in aerospace, robotics, automotive and medical industries.

Prolean’s skilled engineers and best-in-class 5-axis continuous CNC mills can produce your intricate parts with high accuracy.

What Materials Are Available For CNC Milling?

Aluminum Steel Stainless Steel Other Metals Plastics
Al6061 1018 303 Titanium Ti-6Al-4V (TC4) ABS
Al6063 1045 304 Brass C360 PP
Al6082 A36 316 Brass C2680 POM-M, POM-C
Al7075 D2 316L Alloy Steel 4140 PC
Al2024 A2 410 Alloy Steel 4340 PEEK
Al5083 20Cr 17-4PH Copper C110 HDPE

Prolean offers a wide variety of materials for CNC Milling including both metals and plastics. Please see the list for a sample of the materials we work with.

If you require a material not in this list, please do get in touch as it is likely we can source it for you.

As Machined

Our standard finish is an “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.


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.


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

Passivation part


Passivation is a treatment method to protect the metal from corroding, it generates a more uniform formation of a passive surface that is less likely to react with air and cause corrosion chemically.

Anodizing hardcoat

Type III anodizing provides excellent corrosion and wear resistance, suitable for functional applications.



Electropolishing is an electrochemical process used to polish, passivate and deburr metal parts. It is useful to reduce surface roughness.

Chromate conversion coating


Chromate conversion coating(Alodine/Chemfilm) is used to increase the corrosion resistance of metal alloys while maintaining their conductive properties.

Bead blasting

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. 


Powder coating is a strong, wear-resistant finish that is compatible with all metal materials and can be combined with bead blasting to create parts with smooth and uniform surfaces and excellent corrosion resistance.

Black Oxide

Black Oxide

Black oxide is a conversion coating used to improve corrosion resistance and minimize light reflection.


Here is a list of standard surface finishes. For custom surface finishes or other surface finish options, please check our surface treatment service

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
Smooth machining (1.6 Ra μm/64 Ra μin) All plastics and metals
Bead blasting All metals
Powder coating All metals
Anodizing clear (type II) Aluminum alloys
Anodizing color (type II) Aluminum alloys
Anodizing hardcoat (type III) Aluminum alloys
Brushing + Electropolishing (0.8 Ra μm/32 Ra μin) All metals
Black oxide Stainless steel and copper alloys
Chromate conversion coating Aluminum and Copper alloys
Brushing All metals

Ready To Quote?

If the Material and finishing you need are not one of the above, please feel free to contact us for more available.