Out of round is the difference between the maximum and minimum diameters
of the bar, measured at the same cross section.
Out of square is the difference in the two dimensions at the same cross
section of a square bar, each dimension being the distance between opposite
sides.
Hexagons - Size Tolerances
Specified Sizes Between
Opposite Sides, in.
Size Tolerances, in.
Out of Hexagon, in.
Over
Under
Up to .5000
.5001-1.000
1.001-1.500
1.501-2.000
2.001-2.500
2.501-3.500
0.007
0.010
0.021
1/32
3/64
1/16
0.007
0.010
0.013
1/64
1/64
1/64
0.011
0.015
0.025
1/32
3/64
1/16
Out of hexagon is the greatest difference between any two dimensions
at the same cross section between opposite faces.
Flats - Size Tolerances
Specified Widths
in.
Thickness Tolerance, for Thickness Given,
Over and Under, in.
Width
Tolerance
in.
.203-
.230
.231-
.250
.251-
.500
.501-
1.00
1.01-
2.00
2.01-
3.00
Over
3.01
Over
Under
Up to 1.000
1.001-2.000
2.001-4.000
4.001-6.000
6.001-8.000
0.007
0.007
0.008
0.009
(1)
0.007
0.007
0.008
0.009
0.015
0.008
0.012
0.015
0.015
0.016
0.010
0.015
0.020
0.020
0.025
...
1/32
1/32
1/32
1/32
...
...
3/64
1/16
1/16
...
...
3/64
1/16
...
1/64
1/32
1/16
3/32
...
1/64
1/32
1/32
1/16
...
(1) Flats over 6" in width are not available as hot rolled carbon steel
bars in thickness under .230
