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Aluminum Technical Data
Sheet and Plate
Lateral Bow and Squareness Tolerances

Lateral Bow Tolerances - Flat Sheet and Plate
Specified
Thickness
in.		 Specified
Width
in.		 Allowable Deviation of a side edge from a straight line

Maximum allowable value of AA
Specified Length - in.
Up thru
60		 Over 60
thru 90		 Over 90
thru 120		 Over 120
thru 150		 Over 150
thru 180		 Over 180
thru 210		 Over 210
thru 240+
Tolerance - in.
0.006-0.125 Up thru 4
Over 4 thru 10
Over 10 thru 35
Over 35		 0.250
0.094
0.063
0.032		 0.563
0.219
0.125
0.063		 1.000
0.375
0.188
0.125		 1.563
0.563
0.250
0.188		 2.250
0.875
0.375
0.250		 3.000
1.156
0.500
0.375		 4.000(1)
1.500(1)
0.750(1)
0.500(1)
0.126-0.249 Over 4 thru 15
Over 15		 0.063
0.032		 0.125
0.063		 0.250
0.125		 0.375
0.188		 0.563
0.250		 0.750
0.375		 1.000(1)
0.500(1)
0.250-8.000 Up thru 10
Over 10 thru 18
Over 18		 0.250
0.063
0.032		 0.563
0.125
0.094		 1.000
0.250
0.125		 1.563
0.406
0.219		 2.250
0.594
0.312		 3.000
0.781
0.438		 4.000(1)
1.000(1)
0.562(1)

 
Squareness Tolerances - Flat Sheet and Plate
Specified
Length
ft.		 Specified Width - ft.
Up thru 3 Over 3
Allowable difference in length of diagonals - inches

Maximum difference between AA and BB
Up thru 12
Over 12		 3/32 x width, ft (2)
9/64 x width, ft (2)		 5/64 x width, ft (2)
7/64 x width, ft (2)
(1) Also applicable to any 240-inch increment of longer sheet or plate.
 		 (2) If specified width is other then an exact multiple of 12 in., tolerance is determined by using the next largest exact multiple.

 
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