Hot Rolled Carbon Steel Bars
STANDARD
MANUFACTURING TOLERANCES
Hot Rolled Carbon Steel Bars
ROUNDS, SQUARES and ROUND CORNERED SQUARES
Specified Size In Inches |
Size Tolerances, Inches
Over Under |
Out of Rd. or Sq., Inches |
To 5/16, incl. |
0.005 |
0.005 |
0.008 |
Over 5/16 to 7/16, incl. |
0.006 |
0.006 |
0.009 |
Over 7/16 to 3/8, incl. |
0.007 |
0.007 |
0.010 |
Over 3/8 to 7/8, incl. |
0.008 |
0.008 |
0.012 |
Over 7/8 to 1, incl. |
0.009 |
0.009 |
0.013 |
Over 1 to 1 1/8, incl. |
0.010 |
0.010 |
0.015 |
Over 1 1/8 to 1 ¼, incl. |
0.011 |
0.011 |
0.016 |
Over 1 ¼ to 1 3/8, incl. |
0.012 |
0.012 |
0.018 |
Over 1 3/8 to 1 ½, incl. |
0.014 |
0.014 |
0.021 |
Over 1 ½ to 2, incl. |
1/64 |
1/64 |
0.023 |
2 to 2 ½, incl. |
1/32 |
0 |
0.023 |
2 ½ to 3 ½, incl. |
3/64 |
0 |
0.035 |
3 ½ to 4 ½, incl. |
1/16 |
0 |
0.046 |
4 ½ to 5 ½, incl. |
3/64 |
0 |
0.058 |
Over 5 ½ to 6 ½, incl. |
1/8 |
0 |
0.070 |
Over 6 ½ to 8 ½, incl. |
5/32 |
0 |
0.085 |
Over 8 ½ to 9 ½, incl. |
¾ |
0 |
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 Tolerances, Inches
Over Under |
Out of Hexagon, Inches |
To ½ Incl. |
0.007 |
0.007 |
0.011 |
Over ½ to 1, incl. |
0.010 |
0.010 |
0.015 |
Over 1 to 1 ½, incl. |
0.021 |
0.013 |
0.025 |
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. |
0.007 |
0.007 |
0.008 |
0.010 |
… |
… |
… |
Over 1 to 2 incl. |
0.007 |
0.007 |
0.012 |
0.015 |
1/32 |
… |
… |
Over 2 to 4 incl. |
0.008 |
0.008 |
0.015 |
0.020 |
1/32 |
3/64 |
3/64 |
Over 4 to 6 incl. |
0.009 |
0.009 |
0.015 |
0.020 |
1/32 |
3/64 |
3/64 |
Over 6 to 8 incl. |
… |
0.015 |
0.016 |
0.025 |
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.
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