Galvanized steel square tubing is a versatile choice for construction, signage, and framing projects. This article reviews five reliable options, highlighting their dimensions, finish, and key features to help buyers compare at a glance. Each product is evaluated for outdoor durability, fabricability, and suitability for various DIY and professional tasks. Read on to find galvanized square tubes that fit your design and workload.
| Product | Brand | Length / Size | Key Features |
|---|---|---|---|
| Blulu Perforated Tube 1″ x 48″ | Blulu | 48″ length; 1″ x 1″ face | Galvanized A36 steel, 14 gauge, perforated with 7/16″ holes, customizable length, corrosion resistant |
| OnlineMetals A500/A513 Square Tube 1.5″ x 1.5″ | Online Metals | 36″ length | Hot rolled, ASTM A36 compatible, smooth mill surface for fabrication |
| Blulu Perforated Tube 1-1/2″ x 36″ | Blulu | 36″ length; 1.5″ face | Galvanized, 14 gauge, hole pattern uniform across sides, easy to cut and install |
| OnlineMetals A500/A513 Tube-Square 1.5″ x 1.5″ | Online Metals | 24″ length | High-strength carbon steel, ready for welding/drilling, fabrication-friendly |
| Zonon Hot Rolled 2″ x 2″ Tube | Zonon | 47.2″ length; 2″ x 2″ | Hot rolled A35 steel, strong and durable, suitable for heavy-duty uses |
Blulu 1 Pcs 1 x 48″ Perforated Tube
This perforated square tube is crafted from A36 low carbon steel with a galvanized finish, delivering corrosion resistance suitable for outdoor and weather-exposed applications. It measures 48 inches long with a 1″ by 1″ cross-section and 14 gauge (approximately 1.93 mm) thickness. Holes of about 7/16 inches (11 mm) diameter are spaced roughly 1 inch apart on each side, allowing easy mounting of signs or fixtures. The tube is designed for easy customization; you can cut it to your preferred length while maintaining uniform hole diameter and spacing for consistent installation across all four sides.
OnlineMetals A500/A513 Square Tubing, 1.5″ x 1.5″
Hot-rolled carbon steel square tubing, sized at 1.5″ x 1.5″ with a 0.12″ wall and 36″ length. This stock is ASTM A36-compatible, offering solid structural performance for fabrication, brackets, frames, and industrial fixtures. The smooth mill surface makes it straightforward to cut, drill, weld, or notch, enabling quick integration into multi-member assemblies. It’s suitable for both shop fabrication and on-site construction, with compatibility for pairing with other sizes in telescoping or modular setups.
Blulu Perforated Tube 1-1/2″ x 36″
This 1.5″ perforated square tube is a galvanized, corrosion-resistant solution designed for outdoor uses. It features 14 gauge thickness with a 7/16″ hole diameter and 1″ hole spacing, mirroring the perforation pattern of other Blulu tubes in the lineup. The galvanized finish provides rust resistance for long-term outdoor performance, and the uniform hole distribution across all four sides supports straightforward installation for signs, posts, or structural components. It can be cut to a desired length to fit specific applications while maintaining consistent perforation metrics.
OnlineMetals A500/A513 Tube-Square 1.5″ x 1.5″
This unpolished, mill-finished 1.5″ square tube from Online Metals is designed for fabrication-ready projects. With a 0.065″ wall thickness and 24″ length, it’s ideal for building frames, brackets, or fixtures that will be weld-connected or drilled. Its ready-to-work surface supports straightforward modifications like cutting, welding, or drilling, enabling engineers and hobbyists to integrate it into a range of designs—from small fixtures to larger structural assemblies. The stock’s carbon steel composition provides dependable strength for demanding applications.
Zonon Square Hot Rolled Steel Tube 2″ x 2″
Zonon’s 2″ x 2″ hot-rolled square steel tubing offers strong performance for industrial and DIY projects. The product length is approximately 47.2 inches, with a 1/4″ (6 mm) wall thickness. Made from A35 steel via hot-rolling, this tube emphasizes durability and rigidity for heavy-duty applications, including frames, supports, and equipment housings. The hot-rolled finish helps resist deformation under load and provides good weldability for fabrication workflows that require precise joins and sturdy assemblies.
Buying Guide
Key purchase considerations for galvanized steel square tubing include strength, corrosion resistance, and fabrication compatibility. For outdoor signage, perforated tubes with uniform hole patterns simplify mounting and ensure consistent alignment. If you plan to weld or modify the tube, prioritize products with smooth mill finishes or unpolished surfaces designed for welding and drilling. Length options should align with your project plan; longer pieces may require cutting and reassembly, while shorter segments can reduce waste.
Consider wall thickness as a proxy for stiffness and durability. Heavier-wall tubes (e.g., 0.12″ to 0.083″ range) deliver better load-bearing capabilities but are harder to cut and may require more powerful tools. For modular or telescoping applications, look for standard cross-sectional dimensions that pair well with other sizes and with a consistent hole pattern if perforation is needed.
Finish quality and coating matter for long-term outdoor exposure. Galvanized finishes resist rust and corrosion, extending service life in harsh environments. When choosing between hot-rolled and milled surfaces, hot-rolled tubes typically offer higher strength in outdoor frames, while milled finishes provide cleaner surfaces for precise machining and finishing work. Always verify tolerance values, especially for perforated or tightly fitting components, to ensure reliable alignment during assembly.
Finally, assess supplier support and availability. Stocked items with consistent dimensions and clear documentation reduce project delays. For specialty needs like perforated tubing, confirm the hole size, spacing, and edge treatment to guarantee compatibility with fixtures, signs, or specific mounting hardware.