Tolerances | Size: Hot Rolled Alloy
STANDARD MANUFACTURING TOLERANCES
Hot Rolled Alloy Steel Bars
ROUNDS AND SQUARES
| Specified Sizes, In. | Variation from Size in Inches Over Under |
Out-of-Round* or Out-of-Square, In. |
|---|---|---|
| Up to 5/16 incl. | .005 .005 | .008 |
| Over 5/16 to 7/16 incl. | .006 .006 | .009 |
| Over 7/16 to 5/8 incl. | .007 .007 | .010 |
| Over 5/8 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. | 5/64 0 | .035 |
| Over 3½ to 4½ incl. | 1/16 0 | .046 |
| Over 4½ to 5½ incl. | 5/64 0 | .058 |
| Over 5½ to 6½ incl. | 1/8 0 | .070 |
| Over 6½ to 8¼ incl. | 5/32 0 | .085 |
| Over 8¼ to 9½ incl. | 3/14 0 | .100 |
* Out-of-round is the difference between the maximum and minimum diameter of a round 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 .
-each dimension being the distance between opposite faces.
HEXAGONS AND OCTAGONS
| Specified Sizes between Opposite Sides in Inches |
Variation from Size in Inches Over Under |
Max. Difference in Inches (Three Measurements) Hexagons Only |
|---|---|---|
| Up 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 |
SQUARE EDGE AND ROUND EDGE FLATS
Tolerances apply to thickness in inches
Variations from Thickness in Inches
(Tolerances are over or under)
| Specified Width in Inches | Under ¼” thick | ¼ to ½” thick | Over ½”to 1” thick | Over 1” to 2”thick | Over 2” to 4” thick | Variations from width in Inches Over Under |
|---|---|---|---|---|---|---|
| To 1 incl. | .007 | .008 | .010 | … | … | 1/64 1/64 |
| Over 1 to 2 incl. | .007 | .012 | .015 | 1/32 | … | 1/32 1/32 |
| Over 2 to 4 incl. | .008 | .015 | .020 | 1/32 | 3/64 | 1/14 1/22 |
| Over 4 to 6 incl. | .009 | .015 | .020 | 1/32 | 1/14 | 3/32 1/16 |
| Over 6 to 8 incl. | .015 | .016 | .025 | 1/32 | 1/14 | 1/8 3/32 |
Standard Straightness – ¼” in any 5 feet, or ¼” x number of feet of length divided by 5
Special Straightness – 1/2 ” in any 5 feet, or ½” x number of feet of length divided by 5
NOTE: Straightness tolerances do not apply to hot rolled alloy steel bars if any subsequent heating operation has been preformed.
Allowance for machining- refer to dates section