3-1/2″ x 3-1/2″ x 3 gauge (.250″ wall) square steel tubing is manufactured from ASTM A500 steel, a cold-formed carbon steel specification designed for extremely heavy-duty structural applications. This hollow structural section (HSS) features a large square profile with a thick wall, delivering exceptional strength, rigidity, and durability for high-load and industrial projects. Typically produced in Grade B, it provides excellent weldability, precise dimensional consistency, and reliable performance in demanding construction and fabrication environments.

Applications:
3-1/2″ square steel tubing (3ga) is commonly used in:
• Heavy-duty structural frames, columns, and supports
• Industrial machinery bases and equipment stands
• Gates, railings, and security structures requiring maximum strength
• Automotive and trailer chassis components
• Load-bearing fabrication and large-scale construction projects
• Structural bracing in commercial and industrial settings

Advantages:
• Maximum strength: Thick wall (.250″) supports very high loads and resists deformation
• 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 projects
• Consistent quality: Manufactured for precise dimensions and reliable fit

Summary:
The 3-1/2″ x 3-1/2″ x 3 gauge ASTM A500 square steel tube is a premium heavy-duty structural material designed for the most demanding applications. Its thick wall, exceptional strength, and weldability make it ideal for reinforced frames, supports, and high-load industrial and construction projects.