Processing of Perforated Metal
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, you need specify only one or the other, not both.
Hole pattern is the arrangement of holes on a sheet-either staggered or straight rows. In a staggered hole pattern, the direction of the stagger is normally parallel to the short dimension of the sheet.
The standard pattern is 60° staggered. It is the strongest, most versatile, and economical pattern of the perforated choices.
Hole size is the diameter of the perforation. We carries a wide range of round hole sizes (from 0.5mm to100mm ) and special order required as long as it meets minimum hole size requirements. As a rule of thumb, the hole diameter should be at least the same size as the thickness of the perforated material or larger. Preferably, the hole should be at least twice the size of the material thickness.
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.
Bar width is the measure of the material between the outer edge of one hole to the outer edge of the adjoining hole. If you designate bar width, be sure that the bar width meets the guidelines for minimum bar width. As a rule of thumb, the bar width should larger than the thickness of the material. Preferably, the bar will be at least twice the material's thickness.
Margins or special borders
Margins are the blank area along the edges of the sheet. The standard sheet is the minimum margins along the length and no margins along the width.
If you purchase the product with special margins, you should provide the width of each margin on all four sides (measured from the edge of the sheet to the edge of the first hole) and the direction to which the margin is parallel (side or length dimension). The standard sheet is the minimum margins along the length and no margins along the width. Manufacturing considerations may affect margins. If the margins requested are not possible, we will replace it with the similar products as your consideration.
There are tolerances on thickness, bars, openings, flatness, and shearing for perforated products. You should specify a specific tolerance, so we can give you a precise product.
We have a full and comprehensive finishing service for all of our materials including cutting, notching, rolling, annealing, slitting, forming, welding painting and anodizing.