Size | Hot Rolled Carbon
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.