It’s not that simple… or is it?

June 26, 2012

Regularly we get calls or emails at Accurate Perforating requesting 10 sheets of pattern RS001, or other similar pattern numbers from our patterns page (  Unfortunately, it’s not that simple.  The pattern number is just a piece of the information needed to specify perforated metals, not a finished product in itself.  On the other hand, it’s not really that complicated either.  The RS001 reference number, like all the pattern numbers, specifies several selection criteria, including hole size and shape (round, slot, decorative, etc.), the distance from the center of a hole to the adjacent hole (centers) and the orientation of the pattern (straight or staggered).  These factors combine to determine the “Open Area” of a pattern.  Open area is quite simply that, the percentage of the total surface area of the part that is open compared to the solid metal area.  This is a critical factor in many application of perforated metal and something to be discussed in future entries.


So those are the basics regarding the pattern numbers.  But that is just the beginning.  When selecting perforated metals you also need to select the material.  Accurate has experience perforating practically every common type of metal ( and even some not-so common types.  Once the material type and thickness (gauge) are selected, consideration should be given to material finish such as mill finish or mirror.  This is usually determined by the final processing or application of the material. 

And now it’s time to apply the perforation pattern.  But wait there are a couple more options to consider.  The last two key factors are end patterns and margins.  End patterns refer to the symmetry or the lack of symmetry as it pertains to the lead edge of the pattern and the tail edge of the sheet as it goes through processing.  There are three standard end patterns: unfinished, finished and symmetrical.  Examples of these can be found on our website (  A margin refers to a solid section of metal in or around the perforated material.  Options range from no margins to custom width edge margins through internal margins. Examples of each can be found on our website (


So there you have it.  It may seem like a lot of factors to consider, but there is a method to the madness.  And remember our product specialists are always here to answer your questions and talk you through the not-so-simple selection process. 

Let Accurate Perforating help, it’s just that simple.