5 Must-Have Features in a applications of custom sheet metal enclosures

10, Mar. 2025

 

How to Design Sheet Metal Enclosures: Tips and Best Practices

Sheet metal enclosures offer numerous manufacturing advantages, including faster turnaround times and reduced manufacturing costs. With proper design techniques, these enclosures can be optimized for both functionality and aesthetics. In this article, we will explore tips and best practices for designing sheet metal enclosures. By following these guidelines, you can make informed decisions and achieve high-quality results. SendCutSend's expertise in cutting, bending and finishing makes them an ideal partner for realizing your sheet metal enclosure designs.

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8 Tips for Sheet Metal Enclosures Design

Designing an effective sheet metal enclosure requires a little bit of planning and few considerations. By following these tips you can both design and build quality enclosures from sheet metal. If sheet metal fabrication is outside your current skill set or you don't have the time or desire, SendCutSend can assist with most of the fabrication. We've compiled a short list of tips here to consider when designing your enclosure. 

1. Understand your product's functional and aesthetics requirements 

As with any design, it's a good idea to start with a set of requirements. Basically the what, where and how for what you want your enclosure to do.

  • Size ' Presumably it will enclose some type of components. How will these components be laid out? Are you housing a simple PCB or will you be enclosing an array of rack mounted electronics? 
  • Features ' How will the components be secured to the enclosure? This might require mounting features such as holes, slots, tabs or maybe shelves. It's also common for enclosures to have some sort of cutouts for things like switches, lights or other controls, maybe wire or fluid tubing. How will the enclosure itself be mounted? If it's wall mounted, you might add holes, slots or tabs. Consider what, if anything, may need to flow in and out of the enclosure, such as power, data, heat, air, etc.
  • Access ' Will the components need to be accessed regularly, requiring an opening, a door or possibly a removable panel? Will you need to see into the enclosure without opening it? Possibly include a window.
  • Strength ' How rigid does your enclosure need to be? Will it need to support heavy loads? Will it be mounted to a vehicle or somewhere where shock and vibration may be a factor?
  • Ventilation ' Do your components require ventilation or cooling/heating of any kind? 
  • Environment ' Where will your enclosure be used? This could require external mounting features. It could also drive things like seals or weatherstripping to keep it weather-tight. Electrical enclosures are often rated using a NEMA rating.
  • Aesthetics ' Finally, consider how you want your enclosure to look. You may want a subtle looking enclosure to blend in or you may want your enclosure to showcase what's inside. There's no reason an enclosure can't be functional and attractive.

2. Figure out the desired material for your sheet metal enclosures

Your requirements should help you decide what material (or multiple materials) to build your enclosure from. Each will have a set of advantages and disadvantages. We've listed materials here that can be bent, but you could extend your list of materials greatly by joining the walls of your enclosure by other methods such as welding, adhesives, fasteners, etc. You should also keep in mind that depending on the cut method, cut sheet metal can leave sharp jagged edges, so take care in cutting and handling. Laser cutting is an excellent method for cutting sheet metal as it leaves clean edges.

  • Steel ' Carbon steel is a strong, low-cost choice. It will need to be finished in some way for corrosion protection. Zinc plating and powder coating are excellent options. Galvanized steel is lso available from SendCutSend. For a slightly higher cost but significantly more strength, consider Chromoly.
  • Aluminum ' Aluminum provides a natural corrosion resistance or it can be anodized or powder coated for additional protection and the desired look. Aluminum is also lighter than steel for similar thicknesses. Aluminum is softer than steel, so it may be slightly less durable in high-wear applications. SendCutSend offers Type III anodizing, which provides a harder surface for more wear resistance. Aluminum can work well as a heat sink since it conducts heat very well. This may be useful if your enclosure houses anything needing cooling.
  • Stainless Steel ' With excellent corrosion protection, stainless offers all the benefits of steel without needing to be protected. It can be more expensive than steel.
  • Titanium ' Used in aerospace applications, titanium is a high performing choice offering high strength, low weight and excellent corrosion resistance. The benefits of titanium come at a higher cost.
  • Copper/Brass ' Both copper and brass offer a unique decorative aesthetic. They may not offer the same strength as the other materials listed here, but should be plenty strong in the right applications. Copper is also significantly more conductive electrically and thermally than the other materials listed here, which could be useful for certain applications.
  • Bonus Polycarbonate ' While polycarbonate isn't a sheet metal, it could be an excellent material for an enclosure or even just as a window in an enclosure. It can be bent, offers relatively good strength, is optically clear and has great corrosion resistance. Polycarbonate would be an excellent material for a display case type of enclosure.

3. Choose the right shape 

Rectangular boxes are a fairly common shape for sheet metal enclosures, but other shapes can be used to best suit your needs. Shape could be driven by functionality, ease of manufacturing, space available or even purely aesthetics.

Display cases especially offer a great opportunity for uniquely shaped enclosures. Fluid tanks will often have a unique shape to direct fluid to a specific point, either a drain or a pickup point.

Manufacturing or fabrication of the enclosure itself may be the biggest driver of shape. Using bent panels can reduce the number of parts and joints. Short flanges on the edges of panels can give a convenient place for adhesive, weld or fasteners. SendCutSend's hardware installation can be a great way to hold parts of sheet metal enclosures together.

4. Determine sheet metal gauge and thickness

A critical factor in building anything from sheet metal is determining the thickness of material to use. Strength, stiffness and weight are all clearly influenced by material thickness. Thicker material may provide increased strength and stiffness, but with the trade-off of weight and cost. Another important trait driven by thickness is the bend radius, which we'll cover shortly.

5. Take dimensional tolerances into consideration

Accurate feature size and placement will affect the final fit and finish of your enclosure. When designing your enclosure, consider the tolerances on the manufacturing processes you'll use. Consult with our guidelines page for details on the tolerances achievable using SendCutSend services. 

6. Mind the bend radius

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It's common for sheet metal enclosures to be fabricated using bends. Your design will need to factor in the radius of those bends. Pay particular attention to the proximity of features near bends as they can become distorted if they're too close.

If you're having SendCutSend bend the parts for you, all of the information you'll need, such as bend radius, k-factor, etc. for each of our bendable materials is available on the materials pages. Each material, thickness and machine used to form it will result in a unique bend geometry, so it's important that your design accurately reflects that to get your bends and surrounding features in the correct relative positions.

For even more information on bending, we've put together a whole playlist of videos about bending. You can check it out here.

7. Decide how the enclosure will be assembled

Sheet metal parts can be assembled in multiple ways. Welding is a good choice when the enclosure needs to be sealed well, either to keep weather out or fluids in. Welding seams also allows for them to be ground smooth for a seamless appearance. 

Rivets are a common option for securing sheet metal panels together. They only require a series of matching holes through each panel. This also makes alignment of panels easy. 

Threaded fasteners can be used, either sheet metal screws, nuts and bolts, or PEM fasteners. Sheet metal screws are quick and dirty, but aren't a good choice if disassembly and reassembly is likely to happen. They can also leave sharp protrusions. Nuts and bolts require tool access from both sides to tighten. PEM fasteners can be a little more work to install, but once installed provide a convenient way to assemble sheet metal parts. If you'd like to use PEM hardware, but don't want the hassle of installing it yourself, parts ordered from SendCutSend can be ordered with PEM fasteners installed.

8. Consider how you want to finish your product

Whether it's for corrosion protection, wear resistance or just a beautiful finished appearance, the finish on your enclosure is another design consideration. One option is to select a material that can be finished mechanically. Aluminum, stainless steel, copper and brass can look good polished or brushed. 

For some enclosures you may want a protective finish. Powder coating is a durable finish for nearly any material. For steel, zinc plating provides excellent protection and is available in multiple colors. Aluminum can be anodized, which is both aesthetic and protective. Type III anodize provides an even more durable finish. All of these are available from SendCutSend to make fabricating your enclosure easier. 

Why Should You Use Sheet Metal Enclosures?

Sheet metal enclosures are used in a wide range of applications. They can be used to protect electrical components, display collectibles and even contain fluids on a vehicle. Commercial enclosures are available in sheet metal, castings, extrusions and even plastic. Few of those offer all the advantages of making an enclosure from sheet metal.

Sheet metal is cost-effective, lightweight and generally simple to fabricate. With a little forethought, sheet metal enclosures can be designed in nearly any shape and size. Making your own enclosure allows you to include any and all features you may need for your application, such as windows, switches, ports, drains, doors, locks, etc.

Mastering Your Sheet Metal Enclosures Design 

Sheet Metal Enclosure Design: 9 Tips You Need To Know | CNCfirst

Designing sheet metal enclosures can be challenging, but it can be much easier with some tips. This blog post will review some design tips for sheet metal enclosures. This will include everything from calculating the necessary dimensions to creating openings and slots in the enclosure. So, if you want to create a sheet metal enclosure, be sure to read on!

9 Tips For Sheet Metal Enclosure Design

No matter the size or complexity of an electronic product, there needs to be a form of casing. Sheet metal enclosures have several benefits, including electrical conductivity, emission reduction, and resistance to harsh industrial environments.

Designing a sheet metal enclosure requires knowledge of the product's cost, conductivity, weight, fabrication methods, and intended use. It also includes the environment in which it will operate and the material. Here are eight tips for designing sheet metal enclosures.

1. Know The Product Design Requirements

Designing a sheet metal enclosure starts with knowing the product design requirements. These requirements will guide the entire process, from creating the initial design to selecting suitable materials and manufacturing methods.

In many cases, the end-use of the enclosure will dictate the product design requirements. For example, an enclosure designed in a harsh environment must withstand extreme temperatures, vibrations, and other conditions.

Other essential factors to consider are the size and shape of the enclosure and any special features. Considering these factors, creating a sheet metal enclosure that meets all the necessary product design requirements is possible.

2. Metal Selection

When selecting the type of metal to use, it is vital to consider the environment in which the enclosure will be used and the desired aesthetics. The type of metal you select should also be compatible with the fabrication methods you plan on using.

Ultimately, the best metal for your sheet metal enclosure depends on your needs and requirements. Here are three common metals used to make sheet metal enclosures:

Aluminum

There are many types of aluminum. Aluminum is an excellent option when choosing a material for your sheet metal parts or enclosure.

And aluminum is lightweight yet sturdy, making it ideal for enclosures subject to frequent movement or vibrations.

In addition, aluminum is highly resistant to corrosion, which is vital in an enclosure that will be exposed to the elements.

Stainless Steel

Stainless steel is an excellent choice for corrosive environments or otherwise hostile to other materials.

It is highly durable and resistant to scratching and denting.

It is also non-magnetic, making it ideal for electronic applications.

Furthermore, stainless steel has a high resistance to fire and high temperatures.

Copper

Regarding sheet metal enclosures, copper offers several advantages over other materials.

Copper is an excellent conductor of heat, making it ideal for applications where thermal management is essential.

It also has good corrosion resistance properties, making it ideal for outdoor or marine environments.

Copper is a relatively soft metal, making it easy to work with and allowing for intricate designs. And it has a natural reddish color that can add a unique aesthetic touch to any sheet metal enclosure.

3. Consider the Metal thickness

When designing a sheet metal enclosure, it's crucial to consider the metal thickness to ensure it's robust and sturdy enough to endure the chosen application's intended usage. The thickness of the enclosure is often a factor in its strength, weight, flange length, and punch size.

Generally, the thicker the metal used for the enclosure, the stronger and more durable it is likely to be. The thickness of the metal affects its weight and cost, so it's important to balance these factors with the application requirements. 

Thicker metal can better protect against environmental factors such as heat, moisture, and impact. 

However, thicker metal may also be harder to work with, which can increase production time and cost. 

Designers must consider all these factors and choose an appropriate metal thickness based on the enclosure's intended usage and the available resources.

If you want to learn more, please visit our website applications of custom sheet metal enclosures.

4. Keep Your Design Simple

When it comes to sheet metal enclosures, simplicity is key. A complex design can be challenging to manufacture and assemble and may be more prone to leaks and other problems. That's why keeping your design as simple as possible is essential.

That means avoiding sharp corners, intricate details, and small moving parts. Keeping your design straightforward can help ensure that your enclosure will be easy to produce and function as intended.

So next time you're designing a sheet metal enclosure, remember the importance of simplicity. It could make all the difference in the quality of your final product.

5. Choose The Suitable Shape For The Sheet Metal Enclosure

Regarding sheet metal enclosures, the chosen shape is just as important as the material itself. The wrong shape can make the enclosure less durable and more susceptible to damage, while the right can help improve its overall performance.

L-Shape

The L-shape of a sheet metal enclosure is important for several reasons. It helps distribute the enclosure's weight evenly, preventing it from tipping. 

The L-shape helps to deflect impact forces, which protects the contents of the enclosure from damage.

The L-shape provides additional support for the sides of the enclosure, preventing them from sagging or collapsing. As a result, the L-shape is an essential part of any sheet metal enclosure.

U-Shape

The U-shaped sheet metal enclosure is a popular type on the market today. This is because it offers many advantages over other types of enclosures.

Perhaps an essential advantage is that it is extremely strong and durable. It can withstand a lot of wear and tear, which is ideal for industrial applications.

The U-shaped sheet metal enclosure is also very easy to install, making it an excellent choice for various applications.

This type of enclosure is very affordable, which makes it an attractive option for many businesses.

F-shape

Regarding sheet metal enclosures, the most common shape is the F shape. This design is created by taking two pieces of sheet metal and bending them into an F shape. The resulting enclosure is strong and sturdy, making it ideal for various applications.

One of the benefits of the F shape is that it can be easily customized to fit a wide range of components.

The F shape provides excellent protection against vibrations and other potential damage. Therefore, sheet metal enclosures in an F shape are suitable for use in various industries, including electronics, automotive, and medical.

Folded Box

The folded box shape is often overlooked when designing a sheet metal enclosure. However, this simple shape can be quite beneficial in some ways.

For one, it provides superior strength and rigidity compared to other shapes. This means that it can better protect the contents of the enclosure from impacts and vibration.

The folded box shape is also easier to manufacture than other shapes, leading to significant cost savings.

So, the folded box shape should not be ignored when designing a sheet metal enclosure.

6. Bend Radius

The bending radius is also essential to consider when designing a sheet metal enclosure. The bending radius is the minimum radius at that the metal can be bent without causing damage. If the metal is bent too tightly, it will crack or break. 

As a result, the enclosure will no longer provide adequate protection for the electronics it contains. The bending radius must be large enough to allow the metal to be bent into the desired shape but not so large that it significantly increases the overall size of the enclosure.

In addition, the bending radius must be carefully considered when choosing the thickness of the metal. If the metal is too thin, it will be more prone to damage during fabrication.

On the other hand, if the metal is too thick, it will be more difficult to bend and may require special equipment.

By considering all of these factors, designers can create sheet metal enclosures that are both strong and easy to fabricate.

7. Tolerances For Sheet Metal Enclosure

While sheet metal is known for its durable and sturdy properties, it is also vital to consider tolerances when designing enclosures out of this material.

Tolerances are the acceptable level of variation for a given dimension, and they must be carefully considered to ensure that the enclosure will fit together correctly.

Tolerances can help prevent warping and other forms of distortion during manufacturing. By taking tolerances into account from the beginning, designers can create sheet metal enclosures that are both strong and precise.

8. Right Finishing Operations

Proper Finishing operations are essential in designing sheet metal enclosures for several reasons.

  • Improve the overall appearance of the enclosure
  • Help to protect the enclosure from damage.
  • Improve the enclosure's functionality by making it more resistant to water and dust.
  • Add strength to the enclosure, making it more resistant to physical impacts

The surface finishing operations of sheet metal has polishing, electroplating, anodizing, etc.

Proper Finishing operations are thus an essential part of designing sheet metal enclosures that meet the needs of both end users and manufacturers.

9. Product Validation Testing

Product validation testing is an essential step in the design process of sheet metal enclosures.

Engineers can verify that the product meets all design specifications and performance requirements by performing various tests on the enclosure. These tests help to ensure that the enclosure can withstand the rigors of use in the real world. 

Additionally, product validation testing can help identify potential problems with the enclosure's design, allowing engineers to make changes before the product goes into production.

By performing proper validation testing, engineers can save time and money in the long run by ensuring that their products are designed correctly from the start.

Our Sheet Metal Fabrication Capabilities

We are a contract manufacturer specializing in the design and fabrication of sheet metal parts. We have established ourselves as a leading provider of high-quality enclosures. Our enclosures are used in various industries, including telecommunications, medical, and industrial.

Our team of engineers is an expert in designing functional and stylish enclosures. We use the latest CAD software to create precise and accurate designs. Our manufacturing facility has state-of-the-art equipment that allows us to produce and weld enclosures quickly and efficiently.

We can offer our customers outstanding products at the most competitive prices possible.

Conclusion

Sheet metal enclosure design tips can help create an effective and visually appealing product. By following the simple guidelines outlined in this article, you can streamline your design process and produce a result that will make your customers happy. Have you tried any of these sheet metal design tips?

Using simple tools and tricks, we've shown you how to make a sheet metal enclosure. Now it's time for you to try it out! What design will you create for your next project?

FAQs

When designing sheet metal enclosures, a few common questions come up. Here are some common questions, along with their answers:

What Are The Benefits of Using Sheet Metal?

Sheet metal offers many benefits for enclosure design, including its durability, corrosion resistance, and ease of fabrication. After properly designed and fabricated, metal enclosures can provide many years of trouble-free service.

How Do I Select the Correct Gauge of Sheet Metal?

The answer to this question rests with the intended use of the enclosure and the environment in which it will be used. Generally, thicker sheet metal gauges will be more durable and better able to withstand impact and abrasion. However, thicker gauges also require more time and effort to fabricate. As such, it is crucial to balance thickness and fabrication time when selecting the gauge for your enclosure.

How Do I Protect My Enclosure From Corrosion?

Corrosion is always a concern when working with sheet metal, as even small amounts of exposure can cause rust and degradation over time. To protect your enclosure from corrosion, specify a coating or finish to provide a barrier against moisture and other corrosive agents. Alternatively, you can fabricate your enclosure from stainless steel, which offers superior resistance to corrosion.

What Typical Features Can Be Added to Sheet Metal Enclosures?

Many features can be added to sheet metal enclosures to improve their functionality and appearance. Some standard features include doors, windows, ventilation slots, cable glands, and powder coating. By including these features in your design, you can ensure that your enclosure meets your needs.

For more information, please visit High-quality Sheet Metal Fabrication.