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Carbon Steel Square Tube

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Carbon Steel Square Tube

Carbon steel square tubing is used in a variety of applications including building construction, manufacturing, and general fabrication. We carry carbon steel square tubing in A500/A513 hot-rolled steel square tube and 1018 cold-rolled steel square tube. So, whether you need workhorse hot-rolled steel tubing or the smooth, shiny finish of cold-rolled steel, Online Metals has the product you need. Price and order online and have your carbon steel square tube delivered directly to you.

 

A500-A513 square tube is stocked in most sizes at our metal supply warehouses in Portland, Dallas, Atlanta, Wallingford, Toledo, and Los Angeles. Standard lengths and cut to size are available.

 

We carry Carbon Steel Square Tube in 1018 Metric | A500-A513

 

Relevant Knowledge Hub Resources: 5 Reasons to Cut to Size | Hot Roll vs Cold Roll Steel

Material Properties

Link Icon Carbon Steel Product Guide

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3 1/2" x 0.12" Carbon Steel Square Tube A500 Hot Rolled Part # 10368

3 1/2" x 0.12" Carbon Steel Square Tube A500 Hot Rolled -
Part #: 10368
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

QTY

Update
$21.02 for 1
$21.02 ea.

Dimensions

  • Height: 3.5"
  • Wall: 0.12"
Click for more details
mild-steel-square-tube-hot-rolled-a500-1superZoom-mob{product.code}
Material Meets These Standard(s): ASTM-A500

Key Features

CUSTOM CUT MTR FREE MTR Available
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mild-steel-square-tube-hot-rolled-a500-1superZoom-desk10368

3 1/2" x 0.1875" Carbon Steel Square Tube A500 Hot Rolled Part # 10370

3 1/2" x 0.1875" Carbon Steel Square Tube A500 Hot Rolled -
Part #: 10370
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

QTY

Update
$24.92 for 1
$24.92 ea.

Dimensions

  • Height: 3.5"
  • Wall: 0.1875"
Click for more details
mild-steel-square-tube-hot-rolled-a500-1superZoom-mob{product.code}
Material Meets These Standard(s): ASTM-A500

Key Features

CUSTOM CUT MTR FREE MTR Available
View more product details View more product details
View more product details Click for more details
mild-steel-square-tube-hot-rolled-a500-1superZoom-desk10370

3 1/2" x 0.25" Carbon Steel Square Tube A500 Hot Rolled Part # 10371

3 1/2" x 0.25" Carbon Steel Square Tube A500 Hot Rolled -
Part #: 10371
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

QTY

Update
$33.50 for 1
$33.50 ea.

Dimensions

  • Height: 3.5"
  • Wall: 0.25"
Click for more details
mild-steel-square-tube-hot-rolled-a500-1superZoom-mob{product.code}
Material Meets These Standard(s): ASTM-A500

Key Features

CUSTOM CUT MTR FREE MTR Available
View more product details View more product details
View more product details Click for more details
mild-steel-square-tube-hot-rolled-a500-1superZoom-desk10371

4" x 0.12" Carbon Steel Square Tube A500 Hot Rolled Part # 10376

4" x 0.12" Carbon Steel Square Tube A500 Hot Rolled -
Part #: 10376
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

QTY

Update
$25.39 for 1
$25.39 ea.

Dimensions

  • Height: 4"
  • Wall: 0.12"
Click for more details
mild-steel-square-tube-hot-rolled-a500-1superZoom-mob{product.code}
Material Meets These Standard(s): ASTM-A500

Key Features

CUSTOM CUT MTR FREE MTR Available
View more product details View more product details
View more product details Click for more details
mild-steel-square-tube-hot-rolled-a500-1superZoom-desk10376

4" x 0.1875" Carbon Steel Square Tube A500 Hot Rolled Part # 10378

4" x 0.1875" Carbon Steel Square Tube A500 Hot Rolled -
Part #: 10378
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

QTY

Update
$31.07 for 1
$31.07 ea.

Dimensions

  • Height: 4"
  • Wall: 0.1875"
Click for more details
mild-steel-square-tube-hot-rolled-a500-1superZoom-mob{product.code}
Material Meets These Standard(s): ASTM-A500

Key Features

CUSTOM CUT MTR FREE MTR Available
View more product details View more product details
View more product details Click for more details
mild-steel-square-tube-hot-rolled-a500-1superZoom-desk10378

4" x 0.25" Carbon Steel Square Tube A500 Hot Rolled Part # 10379

4" x 0.25" Carbon Steel Square Tube A500 Hot Rolled -
Part #: 10379
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

QTY

Update
$35.16 for 1
$35.16 ea.

Dimensions

  • Height: 4"
  • Wall: 0.25"
Click for more details
mild-steel-square-tube-hot-rolled-a500-1superZoom-mob{product.code}
Material Meets These Standard(s): ASTM-A500

Key Features

CUSTOM CUT MTR FREE MTR Available
View more product details View more product details
View more product details Click for more details
mild-steel-square-tube-hot-rolled-a500-1superZoom-desk10379

5" x 0.25" Carbon Steel Square Tube A500 Hot Rolled Part # 10391

5" x 0.25" Carbon Steel Square Tube A500 Hot Rolled -
Part #: 10391
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

QTY

Update
$48.05 for 1
$48.05 ea.

Dimensions

  • Height: 5"
  • Wall: 0.25"
Click for more details
mild-steel-square-tube-hot-rolled-a500-1superZoom-mob{product.code}
Material Meets These Standard(s): ASTM-A500

Key Features

CUSTOM CUT MTR FREE MTR Available
View more product details View more product details
View more product details Click for more details
mild-steel-square-tube-hot-rolled-a500-1superZoom-desk10391

6" x 0.12" Carbon Steel Square Tube A500 Hot Rolled Part # 10396

6" x 0.12" Carbon Steel Square Tube A500 Hot Rolled -
Part #: 10396
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

QTY

Update
$34.59 for 1
$34.59 ea.

Dimensions

  • Height: 6"
  • Wall: 0.12"
Click for more details
mild-steel-square-tube-hot-rolled-a500-1superZoom-mob{product.code}

Key Features

CUSTOM CUT
View more product details View more product details
View more product details Click for more details
mild-steel-square-tube-hot-rolled-a500-1superZoom-desk10396

6" x 0.1875" Carbon Steel Square Tube A500 Hot Rolled Part # 10397

6" x 0.1875" Carbon Steel Square Tube A500 Hot Rolled -
Part #: 10397
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

QTY

Update
$46.11 for 1
$46.11 ea.

Dimensions

  • Height: 6"
  • Wall: 0.1875"
Click for more details
mild-steel-square-tube-hot-rolled-a500-1superZoom-mob{product.code}

Key Features

CUSTOM CUT
View more product details View more product details
View more product details Click for more details
mild-steel-square-tube-hot-rolled-a500-1superZoom-desk10397

6" x 0.5" Carbon Steel Square Tube A500 Hot Rolled Part # 10401

6" x 0.5" Carbon Steel Square Tube A500 Hot Rolled -
Part #: 10401
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

QTY

Update
$123.53 for 1
$123.53 ea.

Dimensions

  • Height: 6"
  • Wall: 0.5"
Click for more details
mild-steel-square-tube-hot-rolled-a500-1superZoom-mob{product.code}

Key Features

CUSTOM CUT
View more product details View more product details
View more product details Click for more details
mild-steel-square-tube-hot-rolled-a500-1superZoom-desk10401

20mm x 2mm Carbon Steel Square Tube 1018 Metric 60" Length [+/- 2"] Part # 22481

20mm x 2mm Carbon Steel Square Tube 1018 Metric 60" Length [+/- 2"] -
Part #: 22481

Pack of 3

Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

QTY

Update
$228.05
$228.05 ea.

Dimensions

  • Height: 20mm
  • Wall: 2mm
Click for more details
mild-steel-square-tube-metric-1018-1superZoom-mob{product.code}

Key Features

MTR FREE MTR Available
View more product details View more product details
View more product details Click for more details
mild-steel-square-tube-metric-1018-1superZoom-desk22481

25mm x 2mm Carbon Steel Square Tube 1018 Metric 120" Length [+/- 2"] Part # 23559

25mm x 2mm Carbon Steel Square Tube 1018 Metric 120" Length [+/- 2"] -
Part #: 23559

Pack of 1

Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

QTY

Update
$154.30
$154.30 ea.

Dimensions

  • Height: 25mm
  • Wall: 2mm
Click for more details
mild-steel-square-tube-metric-1018-1superZoom-mob{product.code}

Key Features

MTR FREE MTR Available
View more product details View more product details
View more product details Click for more details
mild-steel-square-tube-metric-1018-1superZoom-desk23559

30mm x 2mm Carbon Steel Square Tube 1018 Metric 60" Length [+/- 2"] Part # 22483

30mm x 2mm Carbon Steel Square Tube 1018 Metric 60" Length [+/- 2"] -
Part #: 22483

Pack of 2

Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

QTY

Update
$193.82
$193.82 ea.

Dimensions

  • Height: 30mm
  • Wall: 2mm
Click for more details
mild-steel-square-tube-metric-1018-1superZoom-mob{product.code}

Key Features

MTR FREE MTR Available
View more product details View more product details
View more product details Click for more details
mild-steel-square-tube-metric-1018-1superZoom-desk22483

30mm x 3mm Carbon Steel Square Tube 1018 Metric 60" Length [+/- 2"] Part # 22482

30mm x 3mm Carbon Steel Square Tube 1018 Metric 60" Length [+/- 2"] -
Part #: 22482

Pack of 2

Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

QTY

Update
$279.13
$279.13 ea.

Dimensions

  • Height: 30mm
  • Wall: 3mm
Click for more details
mild-steel-square-tube-metric-1018-1superZoom-mob{product.code}

Key Features

MTR FREE MTR Available
View more product details View more product details
View more product details Click for more details
mild-steel-square-tube-metric-1018-1superZoom-desk22482

40mm x 4mm Carbon Steel Square Tube 1018 Metric 60" Length [+/- 2"] Part # 22488

40mm x 4mm Carbon Steel Square Tube 1018 Metric 60" Length [+/- 2"] -
Part #: 22488

Pack of 1

Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

QTY

Update
$248.14
$248.14 ea.

Dimensions

  • Height: 40mm
  • Wall: 4mm
Click for more details
mild-steel-square-tube-metric-1018-1superZoom-mob{product.code}

Key Features

MTR FREE MTR Available
View more product details View more product details
View more product details Click for more details
mild-steel-square-tube-metric-1018-1superZoom-desk22488

40mm x 3mm Carbon Steel Square Tube 1018 Metric 60" Length [+/- 2"] Part # 22487

40mm x 3mm Carbon Steel Square Tube 1018 Metric 60" Length [+/- 2"] -
Part #: 22487

Pack of 1

Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

QTY

Update
$193.05
$193.05 ea.

Dimensions

  • Height: 40mm
  • Wall: 3mm
Click for more details
mild-steel-square-tube-metric-1018-1superZoom-mob{product.code}

Key Features

MTR FREE MTR Available
View more product details View more product details
View more product details Click for more details
mild-steel-square-tube-metric-1018-1superZoom-desk22487

50mm x 3mm Carbon Steel Square Tube 1018 Metric 60" Length [+/- 2"] Part # 22489

50mm x 3mm Carbon Steel Square Tube 1018 Metric 60" Length [+/- 2"] -
Part #: 22489

Pack of 1

Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

QTY

Update
$245.67
$245.67 ea.

Dimensions

  • Height: 50mm
  • Wall: 3mm
Click for more details
mild-steel-square-tube-metric-1018-1superZoom-mob{product.code}

Key Features

MTR FREE MTR Available
View more product details View more product details
View more product details Click for more details
mild-steel-square-tube-metric-1018-1superZoom-desk22489

50mm x 4mm Carbon Steel Square Tube 1018 Metric 60" Length [+/- 2"] Part # 22490

50mm x 4mm Carbon Steel Square Tube 1018 Metric 60" Length [+/- 2"] -
Part #: 22490

Pack of 1

Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

QTY

Update
$319.19
$319.19 ea.

Dimensions

  • Height: 50mm
  • Wall: 4mm
Click for more details
mild-steel-square-tube-metric-1018-1superZoom-mob{product.code}

Key Features

MTR FREE MTR Available
View more product details View more product details
View more product details Click for more details
mild-steel-square-tube-metric-1018-1superZoom-desk22490

60mm x 4mm Carbon Steel Square Tube 1018 Metric 60" Length [+/- 2"] Part # 22491

60mm x 4mm Carbon Steel Square Tube 1018 Metric 60" Length [+/- 2"] -
Part #: 22491

Pack of 1

Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

QTY

Update
$389.35
$389.35 ea.

Dimensions

  • Height: 60mm
  • Wall: 4mm
Click for more details
mild-steel-square-tube-metric-1018-1superZoom-mob{product.code}

Key Features

MTR FREE MTR Available
View more product details View more product details
View more product details Click for more details
mild-steel-square-tube-metric-1018-1superZoom-desk22491

60mm x 5mm Carbon Steel Square Tube 1018 Metric 60" Length [+/- 2"] Part # 22492

60mm x 5mm Carbon Steel Square Tube 1018 Metric 60" Length [+/- 2"] -
Part #: 22492

Pack of 1

Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

QTY

Update
$403.16
$403.16 ea.

Dimensions

  • Height: 60mm
  • Wall: 5mm
Click for more details
mild-steel-square-tube-metric-1018-1superZoom-mob{product.code}

Key Features

MTR FREE MTR Available
View more product details View more product details
View more product details Click for more details
mild-steel-square-tube-metric-1018-1superZoom-desk22492

80mm x 3mm Carbon Steel Square Tube 1018 Metric 60" Length [+/- 2"] Part # 22493

80mm x 3mm Carbon Steel Square Tube 1018 Metric 60" Length [+/- 2"] -
Part #: 22493

Pack of 1

Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

QTY

Update
$337.01
$337.01 ea.

Dimensions

  • Height: 80mm
  • Wall: 3mm
Click for more details
mild-steel-square-tube-metric-1018-1superZoom-mob{product.code}

Key Features

MTR FREE MTR Available
View more product details View more product details
View more product details Click for more details
mild-steel-square-tube-metric-1018-1superZoom-desk22493

80mm x 4mm Carbon Steel Square Tube 1018 Metric 60" Length [+/- 2"] Part # 22494

80mm x 4mm Carbon Steel Square Tube 1018 Metric 60" Length [+/- 2"] -
Part #: 22494

Pack of 1

Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

QTY

Update
$444.94
$444.94 ea.

Dimensions

  • Height: 80mm
  • Wall: 4mm
Click for more details
mild-steel-square-tube-metric-1018-1superZoom-mob{product.code}

Key Features

MTR FREE MTR Available
View more product details View more product details
View more product details Click for more details
mild-steel-square-tube-metric-1018-1superZoom-desk22494

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