4″ x 4″ x 11 gauge (.120″ wall) square steel tubing is manufactured from ASTM A500 steel, a cold-formed carbon steel specification designed for medium- to heavy-duty structural applications. This hollow structural section (HSS) features a large square profile with a thicker wall, providing increased strength, rigidity, and durability. Typically produced in Grade B, it offers excellent weldability, precise dimensional consistency, and dependable performance for demanding fabrication and construction projects.

Applications:
4″ square steel tubing (11ga) is commonly used in:
• Structural frames, supports, and columns
• Industrial equipment bases and machinery supports
• Gates, railings, and security structures
• Trailer frames and automotive fabrication
• Equipment enclosures and protective guards
• Commercial and industrial construction projects

Advantages:
• Increased strength: Thicker wall (.120″) supports heavier loads and improves rigidity
• Durable construction: Suitable for medium- to heavy-duty applications
• Excellent weldability: Compatible with MIG, TIG, and stick welding
• Versatile fabrication: Can be cut, drilled, and modified easily
• Consistent quality: Manufactured for uniform dimensions and reliable performance

Summary:
The 4″ x 4″ x 11 gauge ASTM A500 square steel tube is a strong and reliable material for medium- to heavy-duty structural and fabrication projects. Its thicker wall, combined with excellent weldability and durability, makes it ideal for reinforced frames, supports, and load-bearing applications.