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Tolerances – Size: Hot Rolled Carbons

STANDARD MANUFACTURING TOLERANCES
Hot Rolled Carbon Steel Bars
ROUNDS, SQUARES and ROUND CORNERED SQUARES
Specified Sizes, In. Size Tolerances, in
Over Under
Out-of-Round or
Out-of-Square, In.
To 5/16 incl. .005 .005 .008
Over 5/16 to 7/16 incl. .006 .006 .009
Over 7/16 to 3/8 incl. .007 .007 .010
Over 3/8 to 7/8 incl. .008 .008 .012
Over 7/8 to 1 incl. .009 .009 .013
Over 1 to 1-1/8 incl. .010 .010 .015
Over 1-1/8 to 1¼ incl. .011 .011 .016
Over 1¼ to 1-3/8 incl. .012 .012 .018
Over 1-3/8 to 1½ incl. .014 .014 .021
Over 1½ to 2 incl. 1/64 1/64 .023
Over 2 to 2½ incl. 1/32 0 .023
Over 2½ to 3½ incl. 3/64 0 .035
Over 3½ to 4½ incl. 1/16 0 .046
Over 4½ to 5½ incl. 3/64 0 .058
Over 5½ to 6½ incl. 1/8 0 .070
Over 6½ to 8½ incl. 5/32 0 .085
Over 8½ to 9½ incl. ¾ 0 .120

NOTE: Out-of-round is the difference between the maximum and minimum diameters of the bar, measured at the same cross section of a square bar between opposite faces.

HEXAGONS
Specified Sizes between
Opposite Sides in Inches
Size Tolerance, in.
Over Under
Out of Hexagon, Inches
To ½ Incl. .007 .007 .011
Over ½ to 1, incl. .010 .010 .015
Over 1 to 1 ½, incl. .021 .013 .025
Over 1 ½ to 2, incl. 1/32 1/64 1/32
Over 2 to 2 ½, incl. 3/64 1/64 3/64
Over 2 ½ to 3 ½, incl. 1/16 1/64 1/16

Note: Out of hexagon section is the greatest difference between any tow dimensions at the same cross section between opposite faces.

SQUARE EDGE AND ROUND EDGE FLATS
Thickness Tolerances
Thickness tolerances are over and under in inches
Specified Thickness in Inches
Specified Width in Inches .203 to .230 excl. .230 to ¼ excl. ¼ to ½ incl. Over ½ to 1, incl. Over 1 to 2, incl. Over 2 to 3, incl. Over 3
To 1 incl. .007 .007 .008 .010
Over 1 to 2 incl. .007 .007 .012 .015 1/32
Over 2 to 4 incl. .008 .008 .015 .020 1/32 3/64 3/64
Over 4 to 6 incl. .009 .009 .015 .020 1/32 3/64 3/64
Over 6 to 8 incl. .015 .016 .025 1/32 3/64
WIDTH TOLERANCES
Specified Width in Inches Tolerances, Inches
Over Under
To 1, incl. 1/64 1/64
Over 1 to 2, incl. 1/32 1/32
Over 2 to 4, incl. 1/16 1/16
Over 4 to 6, incl. 3/32 1/16
Over 6 to 8, incl. 1/8* 3/32*

*For flats over 6” to 8” in width and to 3” incl. in thickness

ALL HOT ROLLED CARBON STEEL BARS
Straightness Tolerances
¼” in any 5 gt. Or ¼” x number of ft. of length divided by 5.
Because of warpage, Straightness tolerances do not apply to bars if any subsequent heating operation or controlled cooling has been preformed.