Thickness
Tolerance Over Specified Thickness, For Widths Given, in Inches
Thickness (Inches) Thru 47 48 to 59 60 to 71 72 to 83 84 to 95 96 to 107 108 to 119 120 to 131 132 to 143 144 to 167
To under 1/4 0.030 0.030 0.030 0.030 0.030 0.030 0.030 0.030 0.040 -
1/4 to under 5/16 0.030 0.030 0.030 0.030 0.030 0.030 0.030 0.040 0.040 -
5/16 to under 3/8 0.030 0.030 0.030 0.030 0.030 0.030 0.030 0.040 0.040 0.050
3/8 to under 5/8 0.030 0.030 0.030 0.030 0.030 0.030 0.040 0.040 0.050 0.060
3/4 to under 1 0.030 0.030 0.030 0.030 0.040 0.040 0.050 0.050 0.060 0.070
1 to under 2 0.060 0.060 0.060 0.060 0.060 0.070 0.080 0.100 0.100 0.110
2 to under 3 0.090 0.090 0.090 0.100 0.100 0.110 0.120 0.130 0.140 0.150
3 to under 4 0.110 0.110 0.110 0.110 0.110 0.130 0.140 0.140 0.140 0.150
4 to under 6 0.150 0.150 0.150 0.150 0.150 0.150 0.150 0.150 0.150 0.200
6 to under 10 0.230 0.240 0.240 0.240 0.240 0.240 0.240 0.240 0.240 0.270

Tolerance under specified thickness .010" x 3/4 x 52" wide plate, for example, would have a tolerance range of .740-.780"
Because of tolerances, ie thickness, flatness and camber, as well as the hot roll condition, ASTM A36 generally does not finish to specified thickness.

Camber

Permissible camber for sheared and Gas-Cut A36 Plate, All Thicknesses:

Maximum Camber (Inches) = 1/8" x ( Number of feet of length / 5 )

Flatness

For all plates, the longest dimension is considered the length, and flatness tolerance along the length should not exceed the amounts indicated below the specified width and thickness in plate though 12' in length or longer. The flatness variations across the width should not exceed the tabular amount for the specified width

Flatness Tolerances For Specified Widths, in Inches 
(Maximum deviation from a horizontal flat surface)

Thickness Lbs/Sq. FT > 36 36 > 48 48 > 60 60 > 72 72 > 84 84 > 96 96>108
Under 1/4" > 10.2# 0.813 1.125 1.375 1.875 2.000 2.250 2.375
1/4 to under 3/8 10.2 > 15.3 0.750 0.938 1.125 1.375 1.750 1.875 2.000
3/8 to under 1/2 15.3 > 20.4 0.750 0.875 0.938 0.938 1.125 1.313 1.500
1/2 to under 3/4 20.4 > 30.6 0.625 0.750 0.813 0.875 1.000 1.125 1.250
3/4 to under 1 30.6 > 40.8 0.625 0.750 0.875 0.875 0.938 1.000 1.125
1 to under 2 40.8 > 81.7 0.563 0.625 0.750 0.813 0.875 0.938 1.000
2 to under 4 81.7 > 163.4 0.500 0.563 0.688 0.750 0.750 0.750 0.750
4 to under 6 163.4 > 245.0 0.563 0.688 0.750 0.750 0.875 0.875 0.938
6 to under 8 245.0 > 326.7 0.625 0.750 0.750 0.938 1.000 1.125 1.250