Terminology of Perforated Metal
Hole Center
Hole Center is the distance from the center of one hole to the center of the nearest hole in the next adjoining row. Hole center is one of two measures of perforation spacing. The other is open area. Because hole center and open area measure essentially the same property (perforation spacing), you need specify only one or the other, not both.
Open Area
Perforated sheets contain holes and material. Open area is the total area of the holes divided by the total area of the sheet and is expressed as a percent. In other words, open area describes how much of a sheet is occupied by holes. If a perforated sheet has 60 percent open area, then 60 percent of the sheet is holes and 40 percent is material.?
Note: Specify either Open Area or Centers, but not both.
Thickness or Gauge of perforated sheet
Thickness is the measurement from the top surface to bottom surface of the material. Gauge is the most common measurement, but thickness can also be measured in fractional inches or millimeters.
End Patterns
End pattern is the pattern of the perforations at the beginning and the end of the sheet. End patterns are either finished or unfinished. An unfinished end pattern is standard. A finished end pattern requires special tooling and is typically more expensive.
Length and Width of perforated sheet
Length is the overall measurement of the long side of the sheet; width is the overall measurement of the short side of the sheet. Note that mill tolerances for length and width apply to stock sheets unless otherwise specified. If you have a stock sheet cut-to-size, cut-tolerances apply. To specify other than standard tolerances, please use the perforated round hole pattern quote form to specify the required tolerances.
Bar Width of perforated sheet
Bar width is the measure of the material between the outer edge of one hole to the outer edge of the nearest hole. If you specify bar width, be be sure that the bar width meets the guidelines for minimum bar width.
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