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Standard Corner Radius

Mechanical Sizes:
Squares and Rectangles made from tubes of the following diameter ranges:
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
Structural Sizes:
Max. 3 x Nominal Wall Thickness

Outside Dimensions*

Mechanical Sizes:
*Measured at corner at least 2 inches from the cut end of the tubing.
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
Structural Sizes:
Largest Outside Dimension Across Flats, Inches Tolerance †
± Inches
2 1/2 and under ± 0.020
over 2 1/2 to 3 1/2, incl. ± 0.025
over 3 1/2 to 5 1/2, incl. ± 0.030
over 5 1/2 ± 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.

Straightness

Mechanical Sizes: Max. 1/16" in 3 feet
Structural Sizes: Max. 1/8" x Number of feet
of total length divided by 5

Maximum Twist

Mechanical & Structural Sizes:
Largest Dimension, inches Max. Twist*, inches
over 1/2 to 1 1/2, incl. 0.050
over 1 1/2 to 2 1/2, incl. 0.062
over 2 1/2 to 4, incl. 0.075
over 4 to 6, incl. 0.087
over 6 to 8, incl. 0.100
*In 3 feet

Wall Thickness

Mechanical & Structural Sizes: ± 10% of Nominal Wall Thickness

Squareness of Sides

Mechanical Sizes: Max: ± b = c x 0.006"
b = Tolerance for out-of-square
c = Largest external dimension
across flats
Structural Sizes: Adjacent sides may deviate
from 90 ° by ± 2 °

Structural Tubing A 500 Requirements

Chemical
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
Physical
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 %

Convexity & Concavity

Mechanical Sizes:
Largest Nominal O.D., Inches Tolerance ± Inches
2 1/2 and under ± 0.010
over 2 1/2 to 4 ± 0.015
over 4 to 8 ± 0.025
Structural Sizes: Tolerances included in the O.D. Tolerance