Squareness Tolerances

Tech. Info

Squareness Tolerances

Definition: The length and width of a sheet may measure correctly, but sometimes the sheet is not square.  A square sheet has perfect 90° angles in each of the four corners.  To check the squareness of a sheet without measuring the angles diagonal measurements can be used.  The amount a sheet is out of square is the difference between diagonal measurements divided by two.

Example:

If one diagonal measures 84.75", and the other diagonal measures 84.50" then the sheet is said to be .125” out of square because (84.75-84.50)/2 = .125

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 us for Perforated Sheets and Plates over 120"


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