3″ x 3″ x 1/8″ Galvanized Square Tube – Corrosion-Resistant Structural Steel Tubing

This galvanized square steel tube measures 3 in (76.2 mm) x 3 in (76.2 mm) with a wall thickness of 1/8 in (3.2 mm). The hollow section gives excellent strength and torsional stiffness for its weight, and the zinc coating protects against corrosion for outdoor and general-purpose use.

Steel tubing is popular for structural frames, machinery bases, trailers, gates, fences, handrails, canopies, greenhouses, racks, supports and architectural metalwork. The flat faces and sharp corners make it simple to join with welds, brackets and bolted connections, and the closed section is stiffer than open shapes of similar weight.

Key Features

  • Section: 3 in (76.2 mm) x 3 in (76.2 mm) square tube
  • Wall thickness: 1/8 in (3.2 mm)
  • Zinc coating for corrosion resistance
  • High strength-to-weight ratio and torsional stiffness
  • Flat faces simplify welding, bolting and mounting
  • Clean, uniform look suitable for visible applications

Specifications

  • Material: galvanized (zinc-coated) carbon steel
  • Profile: square hollow section
  • Outside dimensions: 3 in (76.2 mm) x 3 in (76.2 mm)
  • Wall thickness: 1/8 in (3.2 mm)

Typical Applications

  • Structural and machine frames
  • Fences, gates and railings
  • Trailers, truck bodies and racks
  • Canopies, pergolas and greenhouse frames
  • Signage, posts and supports
  • General fabrication and repairs

Choosing the Right Tube

Larger sections and thicker walls carry higher loads and span farther. For long spans or structural use, have the design confirmed by an engineer. Galvanized steel is carbon steel protected by a zinc coating. The zinc acts as a barrier against moisture and oxygen and also protects the steel sacrificially at small scratches and cut edges, which is why galvanized material is a long-lasting choice for outdoor, damp and industrial settings.

Fabrication

Tubing can be cut with a saw or abrasive wheel, drilled, bent with suitable tooling and welded. Galvanized steel can be cut, drilled, welded and fastened with standard metalworking tools. Zinc fumes are released when galvanized steel is welded, so work in a well-ventilated area, use appropriate respiratory protection and grind away the coating near the weld zone where possible. After cutting, welding or drilling, touch up exposed steel with a zinc-rich cold galvanizing compound to restore corrosion protection.

Storage and Handling

Handle and store the material off the ground, on dunnage, in a dry and ventilated area. Avoid stacking wet material tightly, as trapped moisture can cause white storage stain (harmless zinc oxide). Dimensions, weights and finish appearance (spangle) may vary slightly between production lots. Please verify critical dimensions and load requirements with your engineer before purchase; this product description is for general guidance and is not a substitute for engineering design. Keep tube ends covered or inclined to prevent water from collecting inside.

Frequently Asked Questions

Is it suitable for outdoor use?
Yes, galvanized tube resists rust in typical outdoor environments.

Can I weld it?
Yes. Ventilate the work area and remove the coating near the weld.

3" x 3" x 1/8" Galvanized Square Tube – Corrosion-Resistant Structural Steel Tubing

Price range: $60.21 through $90.32

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📄 Custom lengths & volume pricing available.

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