Tolerances - Size: Hot Rolled Alloys
STANDARD
MANUFACTURING TOLERANCES
Hot Rolled Alloy Steel Bars
ROUNDS AND SQUARES
|
Specified Size in Inches |
Variation from Size in Inches Over |
Variation from Size in Inches Under |
Out of Round * or Square Inches |
|
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 1/18 to 1 ¼, incl. |
.011 |
.011 |
.016 |
|
Over 1 ¼ to 1 3/8, incl. |
.012 |
.012 |
.018 |
|
Over 1 3/8 to 1 ½, incl. |
.014 |
.014 |
.021 |
|
Over 1 ½ to 2, incl. |
1/64 |
1/64 |
.023 |
|
Over 2 to 2 ½, incl. |
1/32 |
… |
.023 |
|
Over 2 ½ to 3 ½, incl. |
5/64 |
… |
.035 |
|
Over 3 ½ to 4 ½, incl. |
1/16 |
… |
.046 |
|
Over 4 ½ to 5 ½, incl. |
5/64 |
… |
.058 |
|
Over 5 ½ to 6 ½ , incl. |
1/8 |
… |
.070 |
|
Over 6 ½ to 8 ¼, incl. |
5/32 |
… |
.085 |
|
Over 8 ¼ to 9 ½, incl. |
3/14 |
… |
.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 measured between opposite sides in inches |
Variation from Size in Inches
Over |
Variation from Size in Inches
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 |
|
Up 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