Definition: "Out of Square" is the greatest deviation of an end edge from a straight line at right angle to a side and touching one corner. It is also obtained by measuring the difference between the diagonals of the perforated sheet metal or perforated panel. The out of Square deviation is one half of that distance. See example & Chart below:
Example:
84.750" - 84.500" = 0.250"
0.250" Difference on diagonal = 0.125" out of square
SQUARENESS OF SHEETS AND PLATES
TOLERANCE OF RESQUARED SHEETS AND PLATE
Up to 72"
Up to 120"
Over 120"
Thickness
Range
Max Tolerance
Out of Square
Difference of
Diagonal Measure
MAX Tolerance
Out of Square
Difference of
Diagonal Measure
30 - 20Ga Shts.
1/32"
1/16"
1/16"
1/8"
*
19 - 16GA Shts.
1/16"
1/8"
1/8"
1/4"
15 - 12GA Shts.
3/32"
3/16"
3/16"
3/8"
11 -7GA Shts.
3/16"
3/8"
3/8"
3/4"
3/16" - 3/8" Plate
1/4"
1/2"
1/2"
1"
3/8" - 5/8" Plate
3/8"
3/4"
3/4"
1 1/2"
5/8" - 1" Plate
3/4"
1 1/2"
1 1/2"
3"
* Contact Hendrick MFG Co. for Perforated Sheets and Plates over 120"
Hendrick Manufacturing Company 1 Seventh Avenue Carbondale, PA 18407-2251
email: sales@hendrickmfg.com
Squareness Tolerances 
