Sheet Metal Bending Service

Craft precision angles with Prolean’s metal bending services. We ensure every final component or product aligns with the required specifications & standards. You can trust us for high-quality and accurate bending solutions.

  • 1-135°  bends
  • Standard accuracy  ±1°
  • Aluminum, stainless steel, copper, titanium, etc
  • ISO 9001:2015 certified quality control 
  • Lead time as fast as two days

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Home 9 Sheet Metal Bending Services

Why Choose Prolean’s Sheet Metal Bending Service?

We can be your reliable manufacturing partner for any kind of metal bending parts & products. The complex bending features with precision, a wide range of material options, and custom solutions are key advantages from our side.

1. Consistent and accurate custom bending parts for automotive, aerospace, medical, industrial, agriculture, etc. From prototyping to mass production, we turn your designs into reality and make mass production seamless.

2. We adhere to strict and professional standards, from material selection to processing production and quality inspection.

3. Regular communication and support throughout the project. Get a perfect experience for metal bending product manufacturing.

4. Cost-effective yet precise bending parts & products. 

5. Fast delivery time, with the quickest delivery within two days.

Our Sheet Metal Bending Capabilities

Our Advanced CNC bending equipment and qualified engineers work together to execute Air bending, V Bending, Rotatory bending, Folding, Coining, and several other bending processes.

Process Capabilities

Our Sheet Metal Factory has manual and automated bending equipment and corresponding tooling. You can choose any bending process according to your requirements and budget. 

1. Manual Bending

The following manual bending methods or processes are most suitable for small-scale productions. Additionally, our expert operators can create custom bent parts with manual bending. 

  • Press Brake Bending 
  • Roll Bending 
  • Air Bending 
  • Bottoming 
  • Coining

2. Automated Bending

We have two main variations of automated bending services: computer numerical control (CNC) bending and robotic bending. Both of these bending methods produce exact and repeatable bends. Additionally, automated bending is preferred for complex designs and large-scale runs.

Prolean’s automated bending equipments are;

  • CNC Press Brakes
  • CNC Roller Benders
  • Robotic Bending Machines

Specific Capabilities

Description Specification
Bend Variations 1-135 degree
Length Tolerance ± .015″ (0.380mm)
Angle Tolerance ± 1°
Thickness 0.5mm-8mm
Part Size Limit 4000mm x 1000mm
Metal Folding Capacity Up to 1000 tons

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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Copper Sheet Bending 

It offers good strength and hardness, excellent corrosion resistance, and 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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Carbon Steel Sheet Bending

Carbon steel is a high-strength iron alloy with excellent hardness and ductility. It is suitable for high-impact bending parts. Meanwhile, the coating or polishing can be done to increase its corrosion resistance.

Subtypes:  1008, 1020, 1045, 4130, 4340.



Titanium Sheet Bending

Titanium is a strong yet lightweight material. It offers a high strength-to-weight ratio, corrosion resistance, exceptional hardness, biocompatibility, and good ductility.

Subtypes: Titanium  Ti-6Al-4V,  Ti-3Al-2.5V, and Ti-0.3Mo-0.8Ni.


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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

A. If the length of the worksheet is less than 300mm:

Description Tolerance (MM) Tolerance (Inch)
Hole to hole ±0.10MM ±0.0039 inch
Hole to Bend ±0.20MM ±0.0079 inch
Hole to edge ±0.10MM ±0.0039 inch
Edge to edge ±0.15MM ±0.0059 inch
Edge to Bend ±0.20MM ±0.0079 inch
Bend to Bend ±0.25MM ±0.0098 inch
Additional Bend Tolerance ±0.25MM ±0.0098 inch


B. If the length of the worksheet is more than 300mm:

Description Tolerance (MM) Tolerance (Inch)
Hole to hole ±0.10MM ±0.0039 inch
Hole to Bend ±0.30MM ±0.0118 inch
Hole to edge ±0.15MM ±0.0059 inch
Edge to edge ±0.20MM ±0.0079 inch
Edge to Bend ±0.30MM ±0.0118 inch
Bend to Bend ±0.35MM ±0.0138 inch


C. Check the complete guide on our “General Sheet Metal Bending & Stamping Tolerances” here. 

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

Sheet Metal Bending and Forming Guidelines

We suggest the following design rules to bend the metal parts within our tolerance range of precisely ± 0.25 mm in length and ±1 °.

  1. K-factor

It is the ratio of the distance of the neutral axis to the sheet thickness. Maintain K-factor in a range of 0.25 to 0.5.

  1. Uniform Wall thickness

Keep the wall thickness of bending parts consistent throughout the design. Prolean, we can use 8 mm with single sheet punching. If you have doable countersinks with counter-bores in design, that will need post-machining.

  1. Bending radius

The minimum inner bend radius should be at least equal to the thickness of the sheet.

  1. Distance between hole & bending position

The minimum distance between the hole and the bending position should be 2.5 x sheet thickness (t).

  1. C-channel & U-channel

If your bending design contains a C or U-channel, each flange length needs half of the channel base. For example, if the base is 4″, then the flange on either side can be a maximum of 2″ long.

  1. Fillets

Include fillet and chamfer filler in the sharp corners. The filler size should be Fillets with half the sheet thickness.

  1. Notch & Tabs

The minimum tab size can be equal to the thickness of the sheet, not exceeding five times the thickness (t). On the other hand, the minimum & maximum range of tab size is 2 to 5 times the sheet thickness.


  • The format of the file is according to the format we accept
  • There is no text in your design. If any, they are in vector values as anchor points and curves.
  • No intersecting or over-lapping lines in the design
  • Designed are scaled as 1:1
  • There are no void objects or open contours in the file.

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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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