Custom Expanded Metal Products: A Practical Guide to Materials, Types, Specifications, and Applications

Custom expanded metal products are widely used in industrial facilities, architectural projects, equipment protection, filtration systems, ventilation screens, fencing, walkways, platforms, and security applications. Expanded metal is produced by slitting and stretching a sheet of metal to form a continuous mesh pattern, usually with diamond-shaped openings. Because the sheet is expanded instead of punched out, the process creates very little waste and keeps the material as one connected piece.

This one-piece structure is one of the biggest advantages of expanded metal. Unlike welded wire mesh or perforated sheet, expanded metal does not rely on separate wires or punched holes. The strands and bonds remain connected from the original sheet, which gives the material steady load distribution, good rigidity, and a stable open area. This makes it suitable for applications that require strength, airflow, visibility, drainage, filtration, guarding, and controlled access.

For buyers, engineers, maintenance teams, and contractors, expanded metal is a practical material because it can be supplied in many metals, patterns, thicknesses, sheet sizes, and finishes. Common options include raised expanded carbon steel, raised expanded aluminum, raised expanded 304 stainless steel, flattened expanded carbon steel, flattened expanded aluminum, and flattened expanded 304 stainless steel. Each type has its own surface profile, strength level, weight, corrosion resistance, and best-use scenario.

According to the National Association of Architectural Metal Manufacturers, EMMA 557-25 is an authoritative guide for expanded metal products and covers product selection, terminology, manufacturing tolerances, manufacturing process, and applications: NAAMM Standards for Expanded Metal.

What Is Expanded Metal?

Expanded metal is a metal sheet that has been slit and stretched into a mesh pattern. During fabrication, the raw sheet passes through special expanding equipment. The machine cuts small slits into the sheet and stretches the metal at the same time. This process forms uniform openings without removing large amounts of material.

The most common opening shape is a diamond. The diamond pattern gives expanded metal a strong structure, good airflow, and balanced load distribution. Depending on the tooling and expansion direction, the sheet can have different opening sizes, strand widths, thicknesses, and open area percentages.

In simple terms, expanded metal is strong like sheet metal, open like mesh, and economical because the expansion process uses the original material efficiently.

Standard Raised Expanded Metal

Standard expanded metal is also called raised expanded metal. It is produced directly from the slitting and stretching process. The strands remain angled, creating a raised and textured surface. This raised profile gives the sheet more grip and rigidity.

Raised expanded metal is often used for industrial platforms, walkways, catwalks, ramps, machine guards, security screens, equipment covers, air intake screens, and outdoor utility applications. The angled strands can provide natural traction, making it useful for areas where slip resistance is important.

Raised expanded metal is also more three-dimensional in appearance. For architectural fencing, facade screens, and infill panels, this raised texture can create a stronger visual effect than flat mesh.

Standard Raised Carbon Steel

Standard raised carbon steel expanded metal is a strong and economical choice for everyday industrial use. It is commonly selected for machine guards, barriers, shop partitions, platform panels, security screens, racks, and general plant maintenance.

Carbon steel provides dependable strength, but it normally requires surface protection when used outdoors or in humid environments. Common finish options include mill finish, painted finish, powder coating, galvanizing, or hot-dip galvanizing after fabrication.

Standard Raised Aluminum

Standard raised aluminum expanded metal is lightweight and corrosion resistant. It is easier to handle than steel and is suitable for projects where weight reduction matters. Aluminum expanded metal is commonly used for air intake screens, ventilation panels, architectural screens, outdoor furniture, greenhouse benches, decorative partitions, and lightweight guards.

Aluminum sheet and plate materials are commonly specified using recognized standards such as ASTM B209, which covers aluminum and aluminum-alloy sheet and plate: ASTM B209 Aluminum Sheet and Plate.

Standard Raised 304 Stainless Steel

Standard raised 304 stainless steel expanded metal is used where corrosion resistance, clean appearance, and long service life are important. It is suitable for food processing areas, public facilities, wet environments, architectural screens, machine guards, filtration support, and premium industrial applications.

ASTM A240/A240M covers chromium and chromium-nickel stainless steel plate, sheet, and strip for pressure vessels and general applications, including architectural, building, construction, and aesthetic uses: ASTM A240/A240M Stainless Steel Sheet and Plate.

Flattened Expanded Metal

Flattened expanded metal starts as standard raised expanded metal. After expansion, it is passed through leveling rolls that press the raised strands into a smoother and flatter surface. This process reduces the overall thickness and gives the sheet a cleaner appearance.

Flattened expanded metal is often used where a smooth surface is preferred. Common uses include screens, fencing, interior partitions, exterior partitions, decorative panels, cabinet inserts, security panels, ventilation covers, and architectural applications.

The main advantage of flattened expanded metal is its smooth profile. It is easier to clean, easier to frame, and often more comfortable for direct contact than raised expanded metal. It is also suitable for applications where the textured traction of raised metal is not required.

Flattened Carbon Steel

Flattened carbon steel expanded metal provides strength at a reasonable cost. It is commonly used for industrial screens, security partitions, equipment guards, fencing, and shop enclosures. Because the surface is flatter than raised expanded metal, it is also suitable for panels that need a cleaner finished look.

Carbon steel should be coated, painted, galvanized, or otherwise protected when exposed to moisture or outdoor weather.

Flattened Aluminum

Flattened aluminum expanded metal is lightweight, clean, and corrosion resistant. It is a good choice for decorative panels, ventilation screens, cabinet panels, architectural fencing, partitions, displays, air filters, and outdoor furniture.

Because aluminum is easier to handle and install, it is often preferred for projects where large sheets must be transported, cut, framed, or mounted on lightweight structures.

Flattened 304 Stainless Steel

Flattened 304 stainless steel expanded metal provides a smooth surface with strong corrosion resistance. It is used in architectural panels, food-related environments, wet areas, machine guarding, screens, and long-service industrial applications.

For harsher environments, 316 stainless steel may be considered because it provides improved resistance in coastal, marine, chemical, or high-moisture conditions.

Expanded Metal Materials

Expanded metal can be produced from many different metals. The right material depends on strength requirements, weight limits, corrosion exposure, appearance, budget, and service environment.

Carbon Steel

Carbon steel is strong, economical, and widely available. It is commonly used for industrial guards, grating, catwalk panels, fencing, storage racks, barriers, and equipment protection. It is a good option when cost control and mechanical strength are priorities.

The main limitation is corrosion. If the product will be used outdoors or in wet conditions, a protective finish should be selected.

Galvanized Steel

Galvanized steel has a zinc coating that helps resist rust. It is commonly used for outdoor barriers, fencing, utility trailers, equipment screens, greenhouse benches, security panels, and site barriers.

Galvanized before expanding and hot-dip galvanized after fabrication are different options. Galvanized before expanding uses pre-coated sheet, while hot-dip galvanizing after fabrication can provide protection over cut and exposed edges.

Stainless Steel

Stainless steel offers excellent corrosion resistance, clean appearance, and strong durability. Common grades include 304 and 316. Grade 304 is widely used for general industrial and architectural applications. Grade 316 is better for marine, coastal, chemical, and highly corrosive environments.

Stainless steel is also highly recyclable. World Stainless notes that stainless steel is one of the key contributors to sustainability because of its recyclability and long service life: worldstainless Recycling.

Aluminum

Aluminum is lightweight, corrosion resistant, and easy to fabricate. It is ideal for ventilation screens, architectural panels, air intake screens, partitions, decorative mesh, and applications where weight reduction is important.

Aluminum is also widely valued in sustainable material design. The Aluminum Association describes aluminum as lightweight, strong, durable, and infinitely recyclable: The Aluminum Association Sustainability.

Copper, Brass, Bronze, and Specialty Metals

Copper, brass, and bronze are used where appearance, conductivity, or decorative value is important. These materials are common in premium interiors, decorative screens, electrical applications, and architectural features.

Nickel alloys such as Monel can provide exceptional durability in difficult environments. Titanium offers an excellent strength-to-weight ratio and is used in demanding or critical applications where performance matters more than cost.

Key Expanded Metal Terms: SWD, LWD, Style Number, and Orientation

Understanding basic expanded metal terms helps buyers order the right product.

SWD: Short Way of Diamond

SWD means Short Way of Diamond. It describes the shorter distance across each diamond opening. This measurement affects the opening size, airflow, visibility, and rigidity of the sheet.

When ordering expanded metal, sheet orientation is often listed with SWD first.

Example: 4’0″ SWD × 8’0″ LWD

LWD: Long Way of Diamond

LWD means Long Way of Diamond. It describes the longer distance across each diamond opening. LWD affects how the sheet expands, how the pattern looks, and how the material performs under load.

Strand Width and Strand Thickness

The strand is the solid metal section between openings. Strand width and strand thickness affect strength, open area, weight, and durability. Wider or thicker strands usually increase strength but reduce open area.

Style Number

Style numbers help describe expanded metal patterns. For example, designations such as #9-3/4 or #13-1/2 combine metal gauge and diamond opening size. A #9-3/4 sheet generally refers to a heavier strand with a 3/4-inch long opening, while #13-1/2 refers to a finer strand with a half-inch pattern.

Style numbers make ordering easier because they connect material thickness and opening size into a recognizable product description.

Raised vs Flattened Orientation

Raised expanded metal has angled strands that create a textured surface. It offers traction, rigidity, and a more industrial appearance.

Flattened expanded metal is rolled smooth after expansion. It provides a flatter profile, cleaner look, and easier handling.

Intended Applications for Expanded Metal

Expanded metal is used across many industries because it balances strength, openness, and cost efficiency.

Floor Grating and Catwalks

Raised expanded metal can provide traction and open drainage for floor grating, catwalks, platforms, and maintenance walkways. The open structure allows water, dirt, and small debris to pass through while maintaining a strong walking surface.

Machine Guards

Expanded metal is widely used for machine guards because it protects workers while allowing visibility and airflow. OSHA’s general machine guarding requirements state that machine guards should be secured where possible and should not create an accident hazard themselves: OSHA Machine Guarding Standard 1910.212.

For machine guarding, correct material thickness, opening size, frame design, and attachment method are important. The guard should prevent access to hazardous moving parts while still allowing inspection, maintenance visibility, and ventilation.

Security Screens and Site Barriers

Expanded metal is strong and difficult to cut through compared with many light mesh products. It is often used for security screens, storefront guards, site barriers, stud wall security screens, drive gates, sidewalk gates, and cab or truck dividers.

Architectural Panels and Fencing

Expanded metal can also be decorative. It is used for architectural panels, fencing, facade screens, balcony infill, partitions, exterior shading, and interior feature walls. Aluminum and stainless steel are common choices for architectural projects because they offer corrosion resistance and clean appearance.

Air Filters and Air Intake Screens

Expanded metal supports air movement while protecting equipment from debris and impact. It can be used as air intake screens, HVAC guards, filter support mesh, ventilation covers, and equipment protection panels.

Greenhouse Benches and Drying Racks

Expanded metal is useful for greenhouse benches and drying racks because it allows airflow, drainage, and light penetration. The open structure helps reduce water accumulation and improves ventilation around plants or drying materials.

Landscape, Utility Carts, and Trailers

Expanded metal is frequently used for utility carts, trailers, outdoor furniture, storage racks, tool carriers, and landscape equipment. It provides strength without creating a fully closed surface, helping reduce weight and improve drainage.

Materials and Finishes

Finish selection depends on where and how the expanded metal will be used.

Mill finish is suitable for indoor machinery, temporary uses, or applications where appearance is not the main concern.

Powder coating adds color and surface protection. It is useful for architectural panels, fencing, furniture, partitions, and branded projects.

Painting is a practical finish for carbon steel when cost control is important.

Galvanizing improves rust resistance for outdoor or humid environments.

Stainless steel may be left unfinished, brushed, polished, or passivated depending on the application.

Aluminum may be mill finished, anodized, or powder coated.

Choosing the right finish improves service life and reduces maintenance needs. For outdoor carbon steel, unprotected mill finish is usually not recommended because corrosion may appear over time.

U-Edging for Expanded Metal

U-edging is a protective channel attached around the edge of expanded metal sheets. It creates a smoother and safer border, giving the panel a more finished appearance.

Expanded metal can have sharp or rough sheared edges after cutting. U-edging helps reduce the risk of cuts or injuries when people may contact the panel. It is especially useful for fencing, infill panels, partition screens, hand-contact areas, gates, and architectural applications.

U-edging can be used with carbon steel, aluminum, stainless steel, and other expanded metal materials. It also helps the panel look more complete when installed in frames or exposed locations.

How to Order Expanded Metal

To order expanded metal accurately, the buyer should provide clear information. This helps avoid mistakes and ensures the product matches the application.

1. Quantity

Specify the number of sheets, panels, or cut pieces required.

2. Sheet Size

Provide the required sheet dimensions. Always confirm whether the size is listed as SWD × LWD or width × length according to the supplier’s ordering method.

Example: 4’0″ SWD × 8’0″ LWD

3. Diamond Orientation

Specify the orientation of the diamond pattern. Orientation affects strength, appearance, drainage, and installation direction.

4. Diamond Width and Length

Specify the nominal diamond size, including SWD and LWD. Common opening options may include 3/16″, 1/4″, 1/2″, 3/4″, 1″, 1-1/2″, and 2″, depending on material and style availability.

5. Gauge or Thickness

For carbon steel and stainless steel, thickness is often listed by gauge, such as #9, #13, or #16. For aluminum, thickness may be listed as decimal thickness, such as .032″, .081″, or .125″.

6. Style

Specify whether the product should be raised or flattened.

Choose raised expanded metal for traction, grip, rigidity, and industrial texture.

Choose flattened expanded metal for smoother surfaces, cleaner appearance, and easier handling.

7. Material Type

Specify the material clearly. Common options include carbon steel, galvanized steel, 304 stainless steel, 316 stainless steel, aluminum, brass, bronze, copper, Monel, titanium, and other specialty alloys.

8. Finish

Specify mill finish, powder coating, galvanizing, painting, anodizing, polishing, or another finish based on the service environment.

9. Edge Treatment

Specify whether U-edging, framing, cutting, welding, bending, or other fabrication services are required.

Expanded Metal Fabrication Services

Custom expanded metal fabrication can include cutting, shearing, bending, welding, forming, framing, U-edging, coating, and assembly. Fabrication helps convert standard expanded sheets into ready-to-install products.

For example, machine guards may need frames and mounting holes. Fencing panels may need U-edging and welded borders. Architectural panels may need powder coating, custom sizes, and consistent orientation. Walkway panels may need reinforcement and specific support spacing.

A good fabrication process should consider both the mesh itself and the final installation. The goal is not only to supply a sheet, but to provide a product that fits the job site, performs safely, and looks professional.

Expanded Metal vs Perforated Metal

Expanded metal and perforated metal are both open-area metal products, but they are made differently.

Expanded metal is slit and stretched, so it creates openings without punching out waste. The sheet remains one continuous structure.

Perforated metal is punched or cut with holes. The removed material becomes scrap unless recycled.

Expanded metal is often stronger in relation to weight because the strands stay connected. It is useful for guarding, grating, fencing, and industrial applications.

Perforated metal provides more control over hole shape, hole size, pattern design, and decorative appearance. It is common in facades, acoustic panels, filters, and decorative cladding.

The best choice depends on whether the project needs strength and traction, precise hole geometry, decorative pattern control, or a specific open area.

Why Choose Custom Expanded Metal Products?

Custom expanded metal products are practical because they can be adjusted to fit the job. Instead of forcing a project to accept a standard sheet, buyers can choose the material, opening size, thickness, style, finish, edge treatment, and fabrication method.

For industrial facilities, expanded metal supports safety, airflow, equipment protection, and access control.

For construction projects, it provides durable screens, partitions, fencing, and grating.

For architecture, it offers texture, transparency, shading, and modern appearance.

For maintenance teams, it provides a versatile material that can be used for repairs, guards, racks, covers, and site improvements.

Steel also supports circular material use when products are designed for durability, reuse, remanufacturing, and recycling: worldsteel Circular Economy.

FAQ

1. What is the main advantage of expanded metal?

The main advantage is its one-piece structure. Because the sheet is slit and stretched instead of assembled from separate wires, expanded metal provides strong load distribution, stable openings, good airflow, and efficient material use.

2. What is the difference between raised and flattened expanded metal?

Raised expanded metal has angled strands and a textured surface. It is good for traction, rigidity, and industrial use. Flattened expanded metal is rolled smooth after expansion, making it better for screens, fencing, partitions, and decorative applications.

3. Which material should I choose?

Carbon steel is strong and economical. Aluminum is lightweight and corrosion resistant. Stainless steel is durable and better for moisture or harsh environments. Galvanized steel is useful for outdoor applications where rust protection is needed.

4. What do SWD and LWD mean?

SWD means Short Way of Diamond, and LWD means Long Way of Diamond. These dimensions describe the diamond opening orientation and are important for ordering, appearance, airflow, and performance.

5. Is expanded metal good for machine guards?

Yes. Expanded metal is commonly used for machine guards because it provides strength, visibility, and airflow. Guard design should also consider OSHA requirements, opening size, frame strength, and secure attachment.

6. Can expanded metal be used outdoors?

Yes. For outdoor use, choose aluminum, stainless steel, galvanized steel, or coated carbon steel. The correct finish is important for corrosion resistance and long service life.

7. What is U-edging?

U-edging is a protective channel placed around the sheet edge. It creates a safer and smoother border and is recommended for fencing, infill panels, partitions, and areas where people may touch the edges.

8. Can expanded metal be customized?

Yes. Expanded metal can be customized by material, sheet size, diamond size, gauge or thickness, raised or flattened style, finish, edge treatment, and fabrication method.

Conclusion

Custom expanded metal products offer a strong, efficient, and versatile solution for industrial, architectural, security, filtration, ventilation, and maintenance applications. Because expanded metal is slit and stretched from a single sheet, it provides a connected structure with consistent openings and dependable performance.

Raised expanded metal is ideal for traction, strength, grating, guards, and industrial surfaces. Flattened expanded metal is better for smoother screens, fencing, partitions, architectural panels, and finished applications. Carbon steel, aluminum, stainless steel, galvanized steel, copper, brass, Monel, titanium, and other metals allow buyers to match the product to the environment and performance requirements.

By understanding SWD, LWD, style numbers, material choices, finish options, and edge treatments such as U-edging, buyers can order expanded metal with confidence. For projects that require strength, airflow, visibility, durability, and custom fabrication, expanded metal remains one of the most practical metal mesh solutions available.

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