SQUARE - RECTANGULAR TUBING TOLERANCES |
Standard Corner Radius |
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| Mechanical Sizes: |
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| Squares and Rectangles made from tubes of the following diameter ranges: |
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| Diameter in Inches |
Wall Thickness in BWG and inches |
Radius Tolerance Inches |
| 1/2 to 1 1/2, incl. |
22 (0.028) |
1/32 to 1/16 |
| 1/2 to 2 1/2, incl. |
20 (0.035) |
1/32 to 1/16 |
| 1/2 to 4, incl. |
18 (0.049) |
3/64 to 5/64 |
| 1/2 to 4 1/8, incl. |
16 (0.065) |
1/16 to 7/64 |
| 3/4 to 4 1/8, incl. |
14 (0.083) |
5/64 to 1/8 |
| over 4 1/8 to 6, incl. |
14 (0.083) |
3/16 to 5/16 |
| 1 to 4 1/8, incl. |
13 (0.095) |
3/32 to 5/32 |
| over 4 1/8 to 6, incl. |
13 (0.095) |
3/16 to 5/16 |
| 1 1/4 to 4, incl. |
12 (0.109) |
1/8 to 13/64 |
| over 4 to 6, incl. |
12 (0.109) |
3/16 to 5/16 |
| 1 1/4 to 4, incl. |
11 (0.120) |
1/8 to 7/32 |
| over 4 to 6, incl. |
11 (0.120) |
7/32 to 7/16 |
| 2 to 4, incl. |
10 (0.134) |
5/32 to 9/32 |
| over 4 to 6, incl. |
10 (0.134) |
7/32 to 7/16 |
| 2 to 4, incl. |
9 (0.148) |
3/16 to 5/16 |
| over 4 to 8, incl. |
9 (0.148) |
7/32 to 7/16 |
| 2 to 8, incl. |
8 (0.165) |
1/4 to 1/2 |
| 2 to 8, incl. |
7 (0.180) |
1/4 to 1/2 |
| 2 1/2 to 4, incl. |
6 (0.203) |
5/16 to 9/16 |
| over 4 to 8, incl. |
6 (0.203) |
5/16 to 9/16 |
| 2 1/2 to 8, incl. |
5 (0.220) |
3/8 to 5/8 |
| 2 1/2 to 8, incl. |
4 (0.238) |
3/8 to 5/8 |
| 2 1/2 to 8, incl. |
3 (0.259) |
3/8 to 5/8 |
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| Structural Sizes: |
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| Max. 3 x Nominal Wall Thickness |
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Outside Dimensions* |
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| Mechanical Sizes: |
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| *Measured at corner at least 2 inches from the cut end of the tubing. |
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| Largest Nominal Outside Dimension, Inches |
Wall Thickness, Inches |
Outside Tolerance at all Sides at Corners ± Inches |
| 3/16 to 5/8, incl. |
0.020 to 0.083, incl. |
± 0.004 |
| over 5/8 to 1 1/8, incl. |
0.025 to 0.156, incl. |
± 0.005 |
| over 1 1/8 to 1 1/2, incl. |
0.025 to 0.192, incl. |
± 0.006 |
| over 1 1/2 to 2, incl. |
0.032 to 0.192, incl. |
± 0.008 |
| over 2 to 3, incl. |
0.035 to 0.259, incl. |
± 0.010 |
| over 3 to 4, incl. |
0.049 to 0.259, incl. |
± 0.020 |
| over 4 to 6, incl. |
0.065 to 0.259, incl. |
± 0.020 |
| over 6 to 8, incl. |
0.185 to 0.259, incl. |
± 0.025 |
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| Structural Sizes: |
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| Largest Outside Dimension Across Flats, Inches |
Tolerance †
± Inches |
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| 2 1/2 and under |
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± 0.020 |
| over 2 1/2 to 3 1/2, incl. |
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± 0.025 |
| over 3 1/2 to 5 1/2, incl. |
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± 0.030 |
| over 5 1/2 |
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± 1% |
† Tolerances include allowance for convexity or concavity. For retangular sections, the tolerance calculated for the larger flat dimension shall also apply to the smaller flat dimension. This tolerance may be increased by 50% when applied to the smaller dimension, if the ration of the cross-sectional dimension 1.5 to 3, inclusive, and 100%
when the ratio exceeds 3. |
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Straightness |
| Mechanical Sizes: |
Max. 1/16" in 3 feet |
| Structural Sizes: |
Max. 1/8" x Number of feet |
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of total length divided by 5 |
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Maximum Twist |
| Mechanical & Structural Sizes: |
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| Largest Dimension, inches |
Max. Twist*, inches |
| over 1/2 to 1 1/2, incl. |
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0.050 |
| over 1 1/2 to 2 1/2, incl. |
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0.062 |
| over 2 1/2 to 4, incl. |
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0.075 |
| over 4 to 6, incl. |
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0.087 |
| over 6 to 8, incl. |
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0.100 |
| *In 3 feet |
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Squareness of Sides |
| Mechanical Sizes: |
Max: ± b = c x 0.006" |
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b = Tolerance for out-of-square |
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c = Largest external dimension |
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across flats |
| Structural Sizes: |
Adjacent sides may deviate |
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from 90 ° by ± 2 ° |
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Structural Tubing A 500 Requirements |
| Chemical |
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| Heat Analysis |
Grade B |
Grade C |
| Carbon, Max. % |
0.26 |
0.23 |
| Manganese, Max % |
- |
1.35 |
| Phosphorus, Max % |
0.04 |
0.04 |
| Sulphur, Max % |
0.05 |
0.05 |
| Copper, when copper steel specified, Min % |
0.20 |
0.20 |
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| Physical |
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Grade B |
Grade C |
| Tensile strength, min. psi |
58,000 |
62,000 |
| Yield strength, min. psi |
46,000 |
50,000 |
| Elongation in 2 in. |
23 |
21 |
| (50.8 mm), min % |
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