3″ x 3″ x 7 gauge (.188″ wall) square steel tubing is manufactured from ASTM A500 steel, a cold-formed carbon steel specification designed for heavy-duty structural applications. This hollow structural section (HSS) features a large square profile with a thick wall, providing excellent strength, rigidity, and durability for demanding projects. Typically produced in Grade B, it offers superior weldability, consistent dimensional accuracy, and reliable performance in industrial and construction environments.

Applications:
3″ square steel tubing (7ga) is commonly used in:
• Heavy-duty structural frames, supports, and columns
• Industrial machinery bases and equipment stands
• Gates, railings, and security structures
• Automotive and trailer chassis components
• Load-bearing fabrication projects
• Structural bracing in commercial and industrial construction

Advantages:
• High strength: Thick wall (.188″) supports heavy loads and resists bending
• Durable construction: Ideal for demanding structural and industrial applications
• Excellent weldability: Compatible with MIG, TIG, and stick welding
• Versatile fabrication: Can be cut, drilled, and modified for custom builds
• Consistent quality: Manufactured for precise dimensions and reliable fit

Summary:
The 3″ x 3″ x 7 gauge ASTM A500 square steel tube is a heavy-duty and dependable structural material, ideal for reinforced frames, supports, and load-bearing fabrication. Its thick wall, strength, and weldability make it well-suited for industrial and construction applications requiring durability and performance.