Expanded Metal

MarCo Specialty Steel is a leading supplier of expanded metal. We inventory thousands of sheets, ready for immediate shipment from our 45,000 sq ft centrally located warehouse. We inventory a complete range of 304 Stainless, 316 Stainless, Aluminum, Galvanized and Carbon Steel. We can also custom custom expanded many other stainles steel grades.

Our inventory is constantly evolving and expanding everyday to meet the changing needs of our customers around the country and around the world. All of our material meets the rigorous EMMA Standard 557-99 and ASTM F-1267. If required, most specifications are available as domestically produced and meet the “Buy American Recovery Act” provisions, or as DFAR compliant (DFAR Clause 252.225-7014.) Contact one of our experienced sales staff to discuss how we can work together to meet your specific needs.

Expanded Metal is one of our most versatile product lines and our most economical products as well. The applications are as endless as the benefits gained.

Regular & Flattened Expanded Metal

 Regular vs Flattened Expanded Metal

Regular Expanded Metal is an open mesh, finished product that is simultaneously die-cut and expanded as it moves through the progressive dies on a press. In the expanding process, the metal can be expanded up to ten times its original size, lose up to 80% of its original weight per square foot, and still retain form and rigidity. (Regular Expanded Metal can also be referred to as “Raised” or “Standard” Expanded Metal.)

Flattened Expanded Metal is Regular Extended Metal that has been passed through flattening rolls (cold rolled). This rolling process reduces the thickness of the sheet, stretches the pattern of the sheet, and provides a smooth, flat finish.

Expanded Metal Products:

Expanded Metal Overview

Expanded Metal is made from sheets or coils of solid metal that are slit and stretched with each stroke of the upper die, forming a raised diamond pattern. This pattern is called regular or standard. The pattern varies by the gauge and type of material and the size of the diamond. The sheets can also be flattened by rollers for an optional style by passing them through a cold, roll reducing mill.

1/4" x #18 Flat

1/2" x #13 Flat

3/4" x #9 Flat

The lightweight properties and open area percentages of Expanded Metal allow it to be easily formed for a variety of energy saving applications such as light diffusers, screens, grilles and filters. When you add it's quality of strength to this list, you also make it popular for panel security enclosures, guards, fixtures and more.

Uses for Expanded Metal Products

  • Architectural fencing
  • Security fencing
  • Windows, door & skylight guards
  • Air intake screens
  • Interior partitions & barriers
  • Cab/truck dividers
  • Concrete reinforcement
  • Security mesh
  • Drive & sidewalk gates
  • Light diffusers
  • Machine guards
  • Patio furniture
  • Landscape & utility carts
  • Utility trailers
  • Fire escapes
  • Walkways, mezzanines & stairways
  • Doors & cabinet doors
  • Ceiling lighting
  • RF shielding
  • Fuel cells
  • Electrolytic
  • Filters
  • Gaskets

U-Edging for Expanded Metal

DESCRIPTION Strand Width (A) Strand Width (B) LENGTH (C) Gauge WEIGHT(Kgs)

U-Channel 1/2x1/8x144 CS






U-Channel 1x1/4x144 CS






U-Channel 1x1/8x144 CS






U-Channel 1x1/16x144 CS






Expanded Metal Coils (Reverse Diamond)

Expanded Metal made continuous from coil in Reverse Diamond where the LWD is parallel to the width of the material and the SWD is parallel to the length. Reverse Diamond can be run in any width up to 60” wide. Many small diamond designs are only manufactured as Reverse Diamond styles. This is particularly suited for the manufacturing of filters, chimney caps, and gutter guards.

Ordering Information

Please review the following Ordering Information:


  • Application or use of product
  • Physical requirements
    A. percent of open area B. environment C. loading

Please Specify:

  • Material: carbon steel, aluminum, stainless steel 316 or 304, etc.
  • Item No.: typically expanded metal or grating is specified like the following examples:
    • (1/2 #18 F 4' SWD x 8' LWD Carbon Steel)
    • 1/2 = short way of diamond dimension
    • #18 = gauge
    • "F" = flattened ("S" would indicate standard)
    • 4' SWD x 8' LWD = size of sheet width x length
    • Carbon Steel = material
    • (ie. 4.0# Catwalk 10' SWD x 2' LWD Carbon Steel)
    • 4.0# = wt/per sq. foot of catwalk or grating
    • 10' SWD x 2' LWD = size of sheet width x length
  • Quantity: number of pieces - full size or cut pieces required.
  • Shearing: bond or random . Please note tolerances.
  • Finish: hot-dipped galvanized, special, if any
  • Special Fabrication: circle shearing, cut outs, etc., if any
  • Accessories: U-Edging (state part no.)
  • Stair Tread (state style and size)
  • Terminology & Shearing

Expanded Metal Specs & Info

For more in-depth information specific to our Expanded Metal products, download the PDF below:

Expanded Metal Grating

Expanded Metal



Diamond or Opening
This is the description of the open area formed by strands and bonds. Normally the open area is diamond shaped.
The point where adjacent strands intersect. The bond is always twice the width of the strand.
Short way of diamond, or short way of opening is the dimension measured across the sheet in a direction parallel to the smallest dimension of the diamond.
Long way of diamond or long way of opening is the dimension measured across the sheet in a direction parallel to the largest dimension of the diamond.
This is the nominal distance from the mid-point of one bond to the mid-point of the next bond measured across the SWD. Mesh is expressed in inches.
Opening Size
The area enclosed by bonds and strands.
Overall Thickness
This is the finished thickness and often determines the selection of framing members.
Percent of Open Area
These important relative percentages are used by designers to calculate the degree with which light or air can pass through a piece of expanded metal.
The measurement from a point on one diamond to the same point on an adjacent diamond.
The single metal strip which forms the border of the diamond, or opening. Strand width is the amount of material advanced for expanding as differentiated from strand thickness which is the thickness of metal from which the expanded metal is produced.
The gauge or thickness of metal from which expanded metal is made. Usually, but not always, this conforms to manufacturer's standard gauges. Style is expressed by a number. Grating style is expressed in pounds per square foot.
Each piece should be able to take a 90 degree bend with a 1/4 inch inside radius in either direction, without fracture.
All expanded metal products except grating are leveled after having been expanded.
Out of Square
Expanded metal sheets are generally not perfectly square when finished. Sheets must be re-squared by shearing on all sides for perfect squareness. Reshearing at the mill is not usually done since most sheets are sheared to size by the customer.
Bow in sheet. It is measured by placing a straight edge along the concave side of the sheet parallel to LWD, touching both ends of the sheet. The maximum distance between the edge of the expanded metal and the straight edge is the camber. A sheet may be within tolerance and still have camber.
Regular Expanded Metal
Sheet simultaneously slit and stretched into a grid, non-raveling open mesh. It is readily available in carbon steel, aluminum, and stainless steel.
Flattened Expanded Metal
Manufactured by processing regular expanded metal in a rolling mill. This rolling reduces the thickness of the sheet and provides a smooth flat surface.
Expanded Metal Grating
Sheet or plate expanded into a structural open grating ideal for catwalk and platform application.
Decorative Expanded Metal
Manufactured with unique shaped openings which posses great appeal for architects and designers.
Stair Treads
Expanded metal grating stair treads are fabricated using 4# grating, angles and bars. They are shipped ready for installation on the job.
Limited finishes can be accomplished at manufacturing plants. This includes hot dip galvanizing and pre-galvanizing.
Sheet Size
While expanded metal can be manufactured in many varying sheet sizes, practical limitations are such that it is wise to select sheet sizes shown by catalog.

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