Regular Expanded Metal goes through a process of slitting and stretching metal sheet to form the standard or regular style of expanded metal. The expanded metal now has strands and intersecting strands called bonds forming a sharp angle to the original plane of the solid sheet. This process creates the unique pattern and allows a single sheet of metal to be processed into several sheets of expanded metal.

Metals commonly expanded include but are not limited to…

  • Steel- Cold Rolled (CRS)
  • Hot Rolled (HRS)
  • Electro Galvanized Steel
  • Stainless Steel
  • Aluminum
  • Titanium
  • Brass
  • Copper

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Expanded Metal Patterns


1/4″ 20R


1/2″ 13R


3/4″ 9R


1-1/2″ 9R

Regular Grating Table

Expanded Metal

AMICO’s expanded metal is versatile. You will find it used in almost any industrial or commercial application.  Expanded metal permits excellent control of light and circulation of air. It also provides clear visibility in such applications as enclosures and machine guards.

Expanded Metal is made from metal plates or sheets that are simultaneously slit and expanded in a cold forming process creating diamond shaped openings of uniform size and thickness.

• Regular Expanded Metal is a finished product as it comes from the press. The strands and bonds are set in a uniform manner creating different size openings and thicknesses.  This regular or raised configuration gives added strength and rigidity as well as slip resistance to the mesh.

• Flattened Expanded Metal is regular expanded metal which has been cold rolled leaving a flat, smooth surface.

Edge Conditions
Closed diamonds all four sides.  No open diamonds.


Random shear 1 side and 1 end causing open diamonds on 1 side and 1 end.


Random shear 2 sides causing open diamonds on both LWD’s


Random shear 2 LWD sides causing open diamonds on LWD.


Random shear 4 edges causing open diamonds on all 4 sides.


Classification of Expanded Metal

Expanded metal is defined by Type, Class and Grade per ASTM F1267. Type and Class are required when specifying and ordering.

Type I—Expanded

Type II—Expanded and flattened

Class 1—Uncoated.

Class 2—Hot-dip zinc-coated (galvanized).

Class 3—Corrosion-resisting steel.

Grade A—0.0025 in. (0.06 mm) minimum coating thickness.

Grade B—0.0012 in. (0.03 mm) minimum coating thickness.

The illustration to the right shows that the strands and bonds form a sharp angle to the original plane of the solid sheet.

Sheets are expanded in the regular form.

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Diamond Orientation

When describing or ordering expanded metal the SWD (Short Way of Diamond) is referenced first and the LWD (Long Way of Diamond) is listed second. The illustration below on the left is standard orientation with the SWD running the short length of the panel.

The illustration on the right shows reverse diamond with the SWD running the long length of the panel.

Expanded Metal Diamond Orientation pic