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This specification covers square and rectangular tubing, manufactured with the same stringent mill controls and quality assurance systems used to produce all Swepco tubular products. Welding machines, operators and procedures are A.S.M.E. code qualified.
Square and rectangular tubing in sizes through 12" outside dimension, up to 1/2" wall thickness is produced with a single longitudinal weld seam. Larger sizes and heavier wall thicknesses will have two weld seams.
Continuous lengths to 40 feet long are available.
The following conditions and tolerances apply to standard production material. However, tubing can be produced to applicable parts of A.S.T.M. A-500 (cold formed welded and seamless carbon steel structural tubing) when requested.
The outside dimensions for square or rectangular
tubing will be as shown below.
Outside Dimensional Tolerances Rectangular and Square Tubing
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Largest Outside Dimension Across Flats 3" to 5 1/2" over 5 1/2" |
Tolerance Plus or Minus .030" 1% |
The above tolerances do not include an allowance for concavity or convexity. All measurements will be taken at a point not less than 2" in from either end.
The chemical and mechanical properties of the finished tubing will equal or exceed those of the raw material specified.
The outside corner radius will be no greater than three times the nominal wall thickness specified.
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Squareness of Sides (X°) No side may deviate by more than 2( from square. |
Length of Tolerance Cut to length +1/4" -0" Random Length 15' to 24' |
The maximum twist in each 3 feet, based on the greatest side dimension, will be as follows:
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over 2 1/2" to 4" incl. .075" |
over 4" to 6" incl. .087" |
over 6" to 8" incl. .100" |
over 8" .112" |
The straightness tolerance for any tube will not exceed an amount calculated using the following formula.
5
Each length of tubing shall be legibly marked with the name Swepco, size, grade of material and heat number.
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