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Rectangular Structural Steel Tubing Manufacturer

Rectangular Steel Tubing

Rectangle steel tubing is known for its strength, durability, and resistance to bending, making it ideal for use in applications where structural support is required. It is often used in the construction of frames, supports, and other structures, as well as in the manufacture of machinery and equipment. 

Lock Joint Tube has created a variety of rectangular mechanical steel tubing in the following shapes:

  • Rectangular Tubing with Sharp Corners
  • Rectangular Tubing with Large Corners
  • Bellied Rectangles

We carry steel tubing in square, round, oval, non-symmetrical & specialty shapes. All tubes are produced to ASTM 513 if uncoated or 787 if it is coated. LJT is also able to meet customized requirements and specialty projects.

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Rectangular Tube Capabilities

Outside Diameter: 0.375” – 6.0”

Wall Thickness: 0.03” – 0.375”

Material Types:



Lock Joint Tube makes rectangular structural steel tubing, including proprietary custom shapes, for the following industries:

View Our Customized Mill Capability Success Story
Rectangle structural steel tubing from Lock Joint Tube.



Rectangular Tubing Specifications

  • ASTM A513
  • ASTM A500
  • ASTM A1011
  • ASTM A1008
  • ASTM A787
  • JIS G3445
  • SAE J1392
  • SAE J2340
  • European Equivalents /EU equivalents of above


Specifications in Alloy:

  • 4140 Rectangle Steel Tubing
  • 4130 Rectangle Steel Tubing

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Give us a call at 800-257-6859 or leave us a message.

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