Square Holes may be considered an attractive alternative to round holes in some applications.
Perforated Metal: Features
Choices of opening sizes/areas
Higher ranges of open area than rounds
Variety of gauges and materials
Diversity of patterns
High strength-to-weight ratio
Economical
Versatility
Aesthetic appeal
Ventilation of air, light, sound, gases
Screening of fluids
Pressure equalization or control
Safety and security
Ease of fabrication

Standard Circle Shearing Tolerances

Heavy Gauge Light Gauge

11 gauge carbon steel 24 gauge carbon steel

16 gauge stainless steel 24 gauge stainless steel

Maximum and Minimum 3 - 48 inch diameter: tolerance of +/- 1/8 inch, execpt 11 gauge which has a tolerance of +/- 3/16 inch.




Standard Flatness Tolerances
Flatness tolerances are measured as the maximum deviation for horizontal flat surface. The table below lists the standard flatness tolerances for both sheets and plates.