Shenzhen Prolean Technology Co., Ltd.

CNC Machining


CNC Turning

CNC turning is one of the most widely used manufacturing process for producing parts out of material bars. Prolean provides CNC turning services for high-precision parts used by automation, aerospace, medical, robotics, and other industries.

With our latest CNC lathes and turning centers, even the most complex turned parts are possible. Our experienced engineers work with your designs and deliver bespoke parts with tight tolerances.

CNC Turning
Quality Assurance

Quality Assurance

Competitive pricing

Competitive Pricing

Timely Delivery

Timely Delivery

High Precision

High Precision

What is CNC Turning?

CNC turning is a material removal process used for producing cylindrical parts out of bars of raw material which usually have round but can have hexagonal or square cross-sections too. CNC turning is employed for production of cylindrical and tubular parts like screws, bolts, and washers.

In CNC turning, a cylindrical bar of material is held in a chuck able to rotate at high speeds. A moving single-point cutting tool removes material on the bar’s outer surface or drills a hole in the inner region to produce the geometry as per design.

The CNC lathe cutting the steel cone shape parts. The hi-technology automotive parts manufacturing process by turning machine.
CNC Turning (3)
high precision automotive machining mold and die parts of forging process

The rotating nature of raw material is why turning has the limitation of only producing cylindrical parts. It is also the reason CNC turning is often the most efficient and affordable way of producing certain cylindrical and tubular parts. CNC turning is known for its high-precision surface finishes and rapid production capabilities.

CNC turning is not only a surface machining process either as it includes processes like drilling, facing, boring, cutting, threading, and knurling as well. This gives CNC turning advantage of performing multiple operations without removing the workpiece which also improves accuracy.

Quality Assured:

Dimension Reports

On-time Delivery

Material Certificates

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


Prolean CNC Turning

Prolean’s CNC turning services provide comprehensive solutions for manufacturing of all kinds of turned parts. From design to delivery, we streamline everything for smooth experience and best quality.

Our engineers run feasibility checks on all designs. When required, we offer design help to make the part feasible and machining efficient. Before production begins, we double-check all the dimensions and tolerances so that each part satisfies the highest standards.

What Materials Are Available For CNC Turning?

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 Turning 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.