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How to Calculate Round Hole Perforated Metal Sheet Open Area?

Views: 6     Author: Site Editor     Publish Time: 2022-11-18      Origin: Site Inquire

Round hole is the most popular shape in the perforated metal market. Open area is one most important characteristic when designing or choosing a round hole perforated metal sheet. With wide variety of open area and high strenghth to weight ratio, perforated metal sheet is used in endless applications. Do you know what is the round hole perforated metal sheet open area?

Round 60 Degree Staggered Centers. D² x 90.69 / C² = Open Area %

Round 45 Degree Staggered Centers. D² x 78.54 / C² = Open Area %

Round Straight Centers. D² x 78.54 / C² = Open Area %


What is open area of round hole perforated metal sheet?

Open area is the total area of the holes divided by the total area of the metal sheet and normally expressed by persent. Open area reflects the ratio of perforated holes on the metal sheet. For example, a perforated metal sheet size is 1m*2m,with round hole of 2mm diameter, 60°stagger, 4mm center distance.The open area of this sheet is 23%, meaning that the total area of the punched holes is 0.465㎡(1m*2m*23%), and 77% of the sheet is material.

The most common percentage of open area is between 30% and 50% although more extreme open areas are available depending on the perforation. However, still there is one point to be considered when requiring larger open area. The larger the open area, the more material distortion takes place, especially when the perforated pattern is bordered by margins on all four sides. Because punching holes in a metal sheet adding stresses may result in distortion of the product. So sometimes the percentage open area has to be lower to keep increased strenghth and flatness of the perforated metal sheet especially when galvanising.


How to calculate the open area of round hole perforated metal sheet?

Round hole perforated metal sheet is available in three unique patterns: 60°staggered, 45°staggered and straight line.



Round Hole-60°staggered


The 60°staggered pattern is the most popular distribution as it offers greater structual strenghth and has the most versatile range of open area.

open area of 60° staggered pattern

Round 60 Degree Staggered Centers. D² x 90.89 / C² = Open Area %


Round hole- 45°staggered

open area of 45° staggered pattern

Round 45 Degree Staggered Centers. D² x 78.54 / C² = Open Area %



Round hole- 90°straight line

open area of 90° staggered pattern

Round Straight Centers. D² x 78.54 / C² = Open Area %


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