Technology

The Definitions of Expanded Metal Terminology

  • Bond—the solid intersection of two strands.
  • Camber—the bow of a side or edge from end to end from a straight line.
  • Diamonds—open area of metal after expanding. Most expanded metal open area or patterns are uniform diamond shaped, but may also be hexagonal, louvered, asymmetric, square, or other shapes, or combinations thereof.
  • Edge configuration—refers to the edge condition of a sheet may they be closed diamonds (bonded), or open diamonds (random) produced by shearing.
  • Expanded metal—a rigid sheet of metal that is simultaneously been slit and stretched creating an open diamond pattern.
  • Flattened, (F)—expanded metal that has been cold-rolled after expansion.
  • Flattening—the process of producing flattened expanded metal.
  • Grating—expanded metal that is produced from heavier sheet.
  • Levelness—(flatness of sheet), sheets shall be free from waves or buckets that are in excess of 1–1/2 in. from a plane surface.
  • LWD—nominal dimension, Long Way of the Diamond.
  • LWO—Long Way of the Opening.
  • Regular-raised-standard—(R) expanded metal as it comes from the press. The strands and bonds are set at a uniform angle to the plane of the sheet.
  • SWD—nominal dimension, Short Way of the Diamond.
  • SWO—Short Way of the Opening.
  • Shearing—cutting the sheet to a specific size or tolerance.
  • Squareness—the dimensional variance a side and edge are out of square.
  • Strand thickness—thickness of the base metal
  • Strand thickness and strand width—can be varied to create different expanded metal products for different applications.
  • Strand width—amount of material fed through top and bottom dies to produce one strand.
  • Taper—edges of a sheet that deviates from parallel.

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