Price range: $44.87 through $244.22
4″ x 4″ x 3/8″ (.375″ wall) square steel tubing is manufactured from ASTM A500 steel, a cold-formed carbon steel specification designed for extreme-duty structural applications. This hollow structural section (HSS) features a large square profile with an extra-thick wall, delivering maximum strength, rigidity, and durability for the most demanding industrial and construction projects. Typically produced in Grade B, it provides excellent weldability, precise dimensional consistency, and reliable performance under high stress and heavy loads.
Applications:
4″ square steel tubing (3/8″ wall) is commonly used in:
• Heavy structural columns, beams, and support frames
• Industrial machinery bases and heavy equipment supports
• Bridges, platforms, and large-scale construction projects
• Trailer frames and heavy-duty automotive fabrication
• Security structures and reinforced barriers
• Load-bearing and high-stress structural assemblies
Advantages:
• Extreme strength: Extra-thick wall (.375″) supports very high loads and resists deformation
• Superior durability: Designed for the most demanding structural applications
• Excellent weldability: Compatible with MIG, TIG, and stick welding
• High rigidity: Minimizes flex and deflection under stress
• Consistent quality: Manufactured for precise dimensions and reliable performance
Summary:
The 4″ x 4″ x 3/8″ ASTM A500 square steel tube is an ultra heavy-duty structural material built for maximum strength and durability. Its extra-thick wall and robust design make it ideal for high-load, high-stress applications in industrial, commercial, and large-scale construction projects.
* Prices are subject to change without notice due to fluctuations in the metals market. | All “Value Length” and “Value Pack” item measurements are subject to standard mill tolerances. | Products may be manufactured several thousandths of an inch over or under the stated dimensions and still be within acceptable mill tolerances. All bar, tube, structural, pipe, sheet, plate, and similar products sold on our website are custom cut to the lengths and sizes selected by the customer at the time of purchase. These are not stocked as pre-cut items. Because each order is cut specifically to customer specifications, all cut materials are considered custom products and are not eligible for cancellation, return, or exchange once production has begun. Our standard cutting tolerances are:
