Choosing the right 1.5 inch square tubing strengthens frames, supports shelves, and underpins DIY machinery projects. This guide highlights five relevant steel-tubing options that align with common fabrication needs, with an emphasis on structural integrity, workability, and practical use in metalwork. Each item below is showcased with key specs and a direct Amazon link for quick review and purchase considerations.
Summary of Selected Products | A quick reference to the five highlighted tubes:
| Product | Brand | Dimensions | Wall Width | Length |
|---|---|---|---|---|
| OnlineMetals A500/A513 Square Tubing (Hot Rolled) | Online Metals | 1.5″ x 1.5″ | 0.12″ | 36″ |
| Small Parts Mill Steel Tube | Small Parts | 1.5″ x 1.5″ | 0.083″ | 4′ |
| Allstar Square Mild Steel Tubing | Allstar Performance | 1.5″ x 1.5″ | 0.083″ | 7.5′ |
| 1/8″ x 1.5″ x 1.5″ Mild Steel Tube | Generic | 1.5″ x 1.5″ | 0.125″ | Custom length (selectable) |
| OnlineMetals A500/A513 Square Tube (Unpolished) | Online Metals | 1.5″ x 1.5″ | 0.065″ | 24″ |
OnlineMetals A500/A513 Carbon Steel Square Tubing, 36″ Length
The Online Metals 1.5″ square tube is crafted from A500/A513 carbon steel and is hot rolled, offering compatibility with ASTM A36 stock. Its 0.12″ wall and 36″ length make it suitable for rigid frames, racks, and fixtures in shop environments. The smooth fabrication surface supports cutting, drilling, welding, and grinding with predictable results, aiding projects that require dependable tube framing and mounting structures.
Small Parts Mill 1.5″ Square Tube (4′ Length)
Small Parts offers a 1.5″ square tube with a 0.083″ wall thickness and a 4-foot length. This unpolished (mill) steel option is ideal for projects requiring straightforward fabrication, such as simple frames, brackets, or light-duty supports. While country of origin notes China, the tube provides basic structural capability with compatibility for cutting and welding processes typically used in hobbyist and light-industrial settings.
Allstar Square Mild Steel Tubing 1-1/2in x .083in x 7.5ft
Allstar Performance provides a 1.5″ square mild steel tube with an 0.083″ wall, measuring 7.5 feet in length. This section is well-suited for automotive frameworks, frames for small machines, and light-to-medium duty structural components. Its mild steel composition supports reliable welding, drilling, and finishing, making it a practical option for structural members and mounting brackets in performance builds or shop projects.
1/8″ x 1.5″ x 1.5″ Mild Steel Square Tube
This option features a 1.5″ square cross-section with a 0.125″ wall thickness. It is designed for length customization, enabling builders to tailor the tube to precise project requirements. The modest wall thickness supports a balance of strength and weight, suitable for frames, guards, light-duty supports, or hobbyist fabrication that benefits from weldable, formable steel components.
OnlineMetals A500/A513 Carbon Steel Tube-Square, Mill Finish
This unpolished mill finish tube provides strong carbon steel with a 1.5″ height and 0.065″ wall thickness over a 24″ length. The mill finish is suitable for custom finishes and coatings after fabrication. It supports structural applications like frames and supports in both commercial and hobby contexts, and is ready for welding and cutting to fit specialized assemblies.
Buying Guide: Key Purchase Considerations And Comparisons
Material composition matters: carbon steel tubes like A500/A513 offer high strength and weldability, while mild steel options provide workable, economical frames. Consider your load requirements, corrosion exposure, and finish preferences when choosing between hot-rolled and mill-finish tubes.
Wall thickness and outer dimensions: A thicker wall increases stiffness and load capacity but adds weight. For budget-conscious builds, 0.083″ to 0.125″ walls are common; higher thickness supports heavier duty frames and machinery mounts.
Length and customization: Stock lengths (such as 4 ft, 7.5 ft, or 36 in) can reduce on-site joins but may require cutting and finishing. Ensure you have access to proper tools for cutting, drilling, and welding and plan for any waste or trimming needs.
Finish and compatibility: If you plan to weld, drill, or weld-tack, ensure the steel grade is compatible with your fabrication methods. If corrosion resistance is a concern, consider coatings or a galvanized finish or select stainless alternatives where appropriate.
Fabrication readiness: Look for tubes with smooth mill surfaces if you need easy cutting and deburring. Some options note ease of telescoping or compatibility with related profiles for multi-member assemblies.
Cost versus performance: While price varies by alloy and finish, balance cost with the required strength, stiffness, and lifecycle performance. For structural frames and equipment mounts, higher-strength carbon steel often delivers the best value over time.
Availability and sourcing: Ensure the selected tubing is readily available in your region and that supplier lead times align with your project schedule. When ordering, verify exact dimensions, wall thickness, and length to avoid mismatches in assemblies.
Real-world applications: Steel square tubing suits shop frames, machine supports, brackets, benches, and shelving. Aluminum equivalents offer lighter weight for projects where weight savings are critical, but come with different strength and rigidity profiles.