Shenzhen Prolean Technology Co., Ltd.

CNC Machining


Custom Sheet Metal Fabrication

Sheet metal fabrication is the process of manufacturing parts and structures out of metal sheets through various fabrication methods. Cutting, bending, stamping, welding, and assembling are some of the well-known sheet metal fabrication techniques. Sheets of various types of steel, aluminum, brass, copper, and other metals/alloys find use in various industries for part manufacturing.

Industries including aerospace, agriculture, automobile, petroleum, railways, electronics, HVAC, and military use sheet metal fabricated parts in large numbers. It is not always practical for companies to manufacture sheet metal parts in-house. Modern custom sheet metal fabrication services offered by Prolean can be a more suitable option than investing in the fabrication machinery for companies.

Custom Sheet Metal Fabrication

PRO-LEAN Sheet Metal Fabrication

Prolean offers high-precision custom sheet metal fabrication services at competitive rates with quick turnaround times. Our "No MOQ" (Minimum Order Quantity) policy for custom prototype sheet metal parts and final products makes it easier for you to order only the quantity you currently require. Your inventory won’t have to hold unnecessary stock any longer.

Quality Assurance

Quality Assurance

Competitive pricing

Competitive Pricing

Timely Delivery

Timely Delivery

High Precision

High Precision

Our Strength

Our state-of-the-art equipment manufacture the most complex parts with best-in-class accuracy and precision.  The extensive range of materials including metals and their alloys. Some of the sheet materials available in various compositions are aluminum, stainless steel, steel, and brass. With a broad range of surface finish options, we deliver rapid sheet metal parts exactly the way you envisioned it.

Our Strength
Our Strength2
How Does Bending Work2

Our team of skilled engineers with years of experience help your designs be ready for production. Send us your designs, and we’ll take care of delivering quality results.

Quality Assured:

Dimension Report

On-time Delivery

Material Certificates

Tolerances: +/- 0.2mm or better on request.

Sheet Metal Fabrication

Laser Cutting

Laser cutting is the process of cutting sheet metal parts using an intense laser. It can cut through...


Sheet metal bending, as the name suggests, is forming a uniform thickness metal sheet in a shape...


Stamping or pressing is an umbrella term for the processes performed on a stamping press.

Materials Available for Sheet Metal Fabrication

Aluminum Steel Stainless Steel Copper Brass
Al5052 SPCC 301 101 C360
Al5083 A3  SS304(L) C101  H59
Al6061 65Mn SS316(L)    62
Al6082 1018      



Prolean offers a wide variety of materials for Sheet Metal 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.