Sheet Metal Bending

Deliver accurate angles with our bending services, achieving a final product that fits within tight tolerances

  • ISO-2768-c
  • Lead time as fast as one day
  • Aluminium, Steel, Stainless Steel and more

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Home 9 Sheet Metal Bending

Why Choose Our sheet Metal bending Service

If you need any bending service for your project, Prolean is where you can get your parts created from Precise bending operation. The ability to bend objects depends on their thickness, kind of material, and intended use. Accurate bending to meet your needs is difficult, but we make it simple. Thanks to our cutting-edge machinery and qualified engineers, we will continuously fulfill your quality, service, and delivery standards.

Our Sheet Metal Bending Capabilities



Bend angle
Thickness 0.5mm-8mm
Part size limit 4000mm*1000mm

Materials for Sheet Metal Bending

Aluminum CNC Bending

Aluminum is a superior metal in terms of strength-to-weight ratio. It offers High Machinability, ductility, and thermal & electrical conductivity. Parts with aluminum also become highly resistant to corrosion.

Subtypes: 5052, 5083, 6061, 6082

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Brass Bending Part

Golden shiny color, low friction, excellent Machinability, and high electrical & thermal conductivity. Brass can be easily machined and the best choice for low-friction applications.

Subtypes: C360, H59, H62

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It offers good strength, hardness, and excellent corrosion resistance with superior heat and thermal conductivity. It also has a very appealing aesthetic.

Subtypes: 101, C110

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Steel Sheet Metal Bending

High mechanical strength, toughness, resistance to wear and fatigue, and sturdiness. In addition to carbon, other alloying elements can be added depending on the needed mechanical and physical qualities.

Subtypes: 1018, SPCC

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Stainless Steel Sheet

High mechanical strength, Thermal, Wear, and Corrosion resistance. Stainless steel is low-cost and can be machined easily. Parts made from Stainless steel are durable and do not lose that strength over time.

Subtypes: 301, 304, 316

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Finishing Options For Sheet Metal Bending

We provide various surface finish options for your sheet metal project. If your required surface treatment is not listed below, feel free to contact us for more options.

As the machined or deburring

The machined or deburring finish is the standard finish where unwanted attach chips are removed with deburring tools, and sharp edges are chamfered to smooth the surface (3.2 μm).

Bead Blasted

Bead blasting produces a matte texture, removing all the marks of machining tools. It applies to ABS, Aluminum, Brass, Stainless Steel, and Steel parts.


Anodizing involves adding an aluminum oxide coating to aluminum and its alloys. The layers, which come in various colors, increase strength and shield the surface from corrosion.

Powder coating

Powder coating is the electrostatically applying of dry powder to the surface. It produces a thin layer providing excellent resistance to wear, corrosion, and abrasion.


Physical rubbing of a metal surface to create a shiny surface is called a polishing surface finish. It increases the reflectivity and does not affect the dimensional stability of parts.


Brushing is achieved by applying an abrasive brush to the metal surface, which produces a unidirectional satin finish. And it is not recommended for highly corrosive materials.

Smooth machining

Smooth machining is done by controlling the machining process, such as feed rate & cutting speed. It minimizes the tool marks and risk of corrosion.


Black oxide finish reduces surface reflectivity and offers mild corrosion protection. It involves adding a thin layer of magnetite to the surface.


Fine machining

The higher-precision machines produce delicate machining surfaces by utilizing sharper tools and regulating feed rate and cutting speed. Surface roughness up to Ra 0.8 μm can be maintained with smooth machining.


Provides a random, non-linear texture with a shiny, high gloss finish. However, it might be unable to create sharp corners and pockets

Sheet Metal Bending Tolerances

Dimension detail


Edge to edge, single surface 0.005 inch
Edge to hole, single surface 0.005 inch
Hole to hole, single surface 0.002 inch
Bend to edge / hole, single surface 0.010 inch
Edge to feature, multiple surface 0.030 inch
Over formed part, multiple surface 0.030 inch

3 Ways to Ensure Perfection


Metals: ISO-2768 fH (fine)

Plastics: ISO-2768 mK (medium)

Metric threads tolerances: ISO 965-1 standard UN Threads Tolerances: ASME B1.1-2003 standard

Knurling: ISO13444:2012 standard.

Our factory is ISO 9001:2015 certificated

Inspection and Protection

Constant visual inspection conditions

Quantification of cosmetic surface quality

Process requirements

Part cleaning and Protection

Quality Inspection Report

Inspection Confirmation

Dimensional confirmation

Appearance confirmation

Quality documentation

Technology Overview


If you need any bending service for your project, Proleanis where you can get your parts created from Precise bending operation.

The ability to bend objects depends on their thickness, kind of material, and intended use. Accurate bending to meet your needs is difficult, butProlean’s makes it simple. Thanks to our cutting-edge machinery and qualified engineers, we will continuously fulfill your quality, service, and delivery standards.

What is Sheet Metal Bending?

Bending is the manufacturing process in which Sheet metal is transformed into desired shapes by applying pressure along an axis. The shape is created during the bending process through plastic deformation in the bending position.

The traditional bending machines struggle to obtain correct bending angles, and it may take a long time for them to turn at proper angles since they must undergo numerous Hits & Trial Steps. While CNC bending machines operate according to pre-programmed instructions and allow the setting of different bending angles following the desired bending positions, they are faster and more accurate.

CNC bending method produces exact dimensions according to the uploaded CAD file because this technique is more automated and accurate in bending sheet metal than traditional ones. The sheet is shaped using a hydraulic mechanism (Press brake) that the computer can fully control.


  • Complex shapes are possible, including triangles with bent corners and all types of curves up to entire circles.
  • Less production time
  • A high degree of accuracy on bending angle
  • Less production time
  • Cost-effective
  • High Working efficiency
  • Design flexibility
  • Less post-processing
  • Reduced number of parts

Types of Bending

In air bending, the outside edges of a die & punch tip are used to create the bend on sheet metal. Because it requires significantly less tonnage to bend than other forms of bending, it is the most popular among manufacturers. Additionally, air bending offers more flexibility in shape and bending radius.

Rotating cylinders with a V-Opening are used in rotary bending. It is used when a bending angle larger than 900is required. For pre-painted or damaged surfaces, it works best. The roll bending process is used for sheets and bars. The primary purpose of this process is to induce a curve shape bar into the straight plate.

Coning produces consistent bending over sheet metal workpiece like coins that are uniform in shape. It is a straightforward process in which sheet metal is stamped between the punch and die. With Coining, a small tolerance & a high degree of reproducibility can achieve. Additionally, the interior radius can be decreased to any desired level.

Folding, wiping, Joggling, and Elastomer are the other types of bending used in manufacturing.


CNC Bending is used in various industries to make several pieces of equipment and parts. Some of them include;

  • Automotive components
  • Pipes and tubes
  • The exterior of aircraft and other parts
  • Defense
  • Hardware components

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Sheet Metal bending FAQ

What are the Material Options for CNC Bending at Prolean's?

We have various material options for your bending Including, Carbon Steel, Stainless Steel, Aluminum and its alloys, Copper, and Brass.

How Large of Size can be bent at Prolean's?

With the help of our Advanced CNC bending machine, We can bend sheet metal from just a few millimeters to several meters long.The largest bending part size can reach 4m*6m.

Do you offer a Bending service?

We offer custom metal bending services for various industries, including automotive, Medical, recreational vehicles, energy, aviation, and military. We will consistently meet your expectations for quality, service experience, and delivery thanks to our sophisticated equipment and experienced engineers.

What is the Bending Tolerance that Prolean Offers?

Our fully computer-controlled Bending machines can maintain a tolerance of ± 0.25 mm in length and ±1 degree in bending angle.

What is the minimum bend radius I should maintain in my design?

The sheet metal’s thickness affects the minimum bending radius. A straightforward rule in manufacturing states that “the bending radius cannot be less than the thickness of the sheet metal.” So, for instance, the bending radius should be at least 1mm if your sheet is 1mm thick.

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