Large Diameter Black Rectangular Tube

For projects demanding exceptional structural integrity and a sleek, modern aesthetic, large diameter black rectangular tubes are the premier choice. This specialized steel profile combines high load-bearing capacity with the inherent advantages of a rectangular hollow section, making it ideal for a wide range of demanding applications in construction, heavy machinery, industrial frameworks, and architectural design. Our range includes multiple solutions to meet your specific needs, such as our Big Bore Black Rectangular Pipe, engineered for maximum internal flow or material passage. For applications requiring monumental scale, our Oversized Black Rectangular Tube provides unparalleled dimensions for grand structural elements. When specifying materials for critical frameworks, our Large Size Black Rectangular Hollow Section offers superior strength-to-weight ratios. For the most heavy-duty industrial applications, our Heavy Caliber Black Rectangular Tube is designed to withstand extreme stress and environmental challenges. Each product in this category features a durable black oxide or painted finish that provides enhanced corrosion resistance and a consistent, professional appearance.


The Large Diameter Black Rectangular Tube is defined by a precise set of engineering parameters that ensure performance and reliability. The manufacturing process involves forming high-grade steel into a rectangular profile with a consistent wall thickness, followed by a finishing treatment that bonds the black protective layer to the surface. Key attributes include high torsional rigidity, excellent moment of inertia, and a flat surface conducive to welding and joining. Available in various steel grades, such as ASTM A500 Grade B or C, and A1085, these tubes meet stringent industry standards. Below are the typical specifications for our standard range.

Typical Specifications:

  • Material: Carbon Steel (ASTM A500, A1085, or equivalent)
  • Finish: Black Oxidized / Black Painted
  • Shape: Rectangular Hollow Section (RHS)
  • Primary Advantages: High Strength, Corrosion Resistance, Aesthetic Appeal, Weldability
  • Common Standards: ASTM, EN, ISO, JIS

Standard Size & Dimension Table:

Nominal Size (H x W) Wall Thickness (t) Sectional Area Weight per Meter Moment of Inertia (Ix)
200mm x 100mm 8.0mm 45.2 cm² 35.5 kg/m 2480 cm⁴
250mm x 150mm 10.0mm 76.0 cm² 59.6 kg/m 5920 cm⁴
300mm x 200mm 12.5mm 119.0 cm² 93.4 kg/m 11900 cm⁴
400mm x 200mm 16.0mm 178.0 cm² 139.7 kg/m 25600 cm⁴
500mm x 300mm 20.0mm 304.0 cm² 238.6 kg/m 78100 cm⁴

Applications for the Large Diameter Black Rectangular Tube are extensive. In construction, it serves as primary columns, heavy-duty trusses, and support beams for bridges and multi-story buildings. The industrial sector utilizes it for machine bases, conveyor system frameworks, and material handling equipment. Architecturally, it is favored for exposed structural elements in modern designs, sculptural installations, and high-end perimeter fencing or gates where both strength and visual impact are required. Its black finish minimizes the need for further surface treatment on-site, reducing project timelines and maintenance costs.

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