{"product_id":"carbon-steel-square-tubing-3-in-x-1-4-in-x-48-in-structural","title":"Carbon Steel Square Tubing 3 in x 1\/4 in x 48 in - Structural","description":"\u003cp\u003eIn this review the tester found the OnlineMetals A500\/A513 carbon steel square tubing to be a straightforward, heavy-duty material for structural and fabrication projects; it is aimed at builders, machinists, and hobbyists who need a solid, modifiable length of steel rather than a finished architectural element. The single biggest reason to buy is its combination of plain, hot-rolled carbon steel construction and ready-to-modify condition, which makes it useful immediately for welding, cutting, or drilling into frames and machine supports without extra preparation.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-strength carbon steel:\u003c\/strong\u003e The hot-rolled A36 construction delivers reliable structural integrity for load-bearing frames and supports.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3 in profile:\u003c\/strong\u003e The 3 in height offers a predictable cross section that fits common connector hardware and fixture designs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1\/4 in wall thickness:\u003c\/strong\u003e A 1\/4 in wall provides robust stiffness and impact resistance for machine parts and structural members.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e48 in length:\u003c\/strong\u003e The 48 in stick is long enough for many small to medium projects while still being easy to handle and modify in a standard workshop.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReady for modification:\u003c\/strong\u003e Being uncoated and unfilled, the tube can be welded, drilled, cut, or otherwise machined to suit custom designs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable and recyclable:\u003c\/strong\u003e The steel is engineered to resist routine wear and is fully recyclable, supporting long-term use and sustainability goals.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThe tubing is best for fabricators, metalworkers, machine builders, and serious hobbyists who plan to weld, cut, or machine their own components; these users benefit from the raw, uncoated surface and standard A36 carbon steel properties. It also works well for architects or contractors specifying structural elements where a hot-rolled, modifiable section is acceptable.\u003c\/p\u003e\n\u003cp\u003eThose looking for pre-finished, corrosion-proof, or decorative metal should look elsewhere, as this product is supplied uncoated and will show patina or surface rust over time if left untreated; a protective finish is recommended for exposed architectural use.\u003c\/p\u003e\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eGood structural strength from A36 carbon steel makes it suitable for frames and machine supports.\u003c\/li\u003e\n\u003cli\u003eReady-to-modify uncoated surface is convenient for welding, drilling, and cutting without removing finishes.\u003c\/li\u003e\n\u003cli\u003ePractical dimensions (3 in x 1\/4 in x 48 in) work well in many fabrication and model-material applications.\u003c\/li\u003e\n\u003cli\u003eRecyclable material and durable construction support long service life.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eUncoated hot-rolled steel can develop surface rust if not treated or painted after installation.\u003c\/li\u003e\n\u003cli\u003eSize and weight may be overkill for very small, delicate modeling where thinner sections are preferable.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eCarbon steel (ASTM A36)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct standard\u003c\/td\u003e\n\u003ctd\u003eA500\/A513 (hot rolled)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeight\u003c\/td\u003e\n\u003ctd\u003e3 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWall thickness\u003c\/td\u003e\n\u003ctd\u003e1\/4 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e48 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinish\u003c\/td\u003e\n\u003ctd\u003eUncoated, ready for modification\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThis 3 in x 1\/4 in x 48 in carbon steel square tubing is a solid, pragmatic choice for anyone building structural frames, machine supports, or custom metalwork who needs an off-the-shelf A36 tube that is easy to weld and machine. It represents good value when a sturdy, modifiable section is required, but buyers should plan to apply a protective finish if corrosion resistance is essential.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eCan this tubing be welded?\u003c\/strong\u003e\u003cbr\u003eYes. The hot-rolled A36 carbon steel is suitable for common welding methods and general fabrication.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill it rust if left outside?\u003c\/strong\u003e\u003cbr\u003eLeft uncoated, hot-rolled carbon steel can develop surface rust; painting or galvanizing is recommended for long-term outdoor exposure.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs the length suitable for machine frames?\u003c\/strong\u003e\u003cbr\u003eThe 48 in length is convenient for many small to medium frames and can be cut down to size where needed.\u003c\/p\u003e","brand":"Online Metals","offers":[{"title":"Default Title","offer_id":48186924695771,"sku":"B000H9QVV6","price":87.56,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/51mvzNj-mjL._AC_SL1000_2cf2bab6-de6f-4ea1-8e0d-157a6ad8f7b9.jpg?v=1769707285","url":"https:\/\/gearmusthave.com\/products\/carbon-steel-square-tubing-3-in-x-1-4-in-x-48-in-structural","provider":"GearMustHave","version":"1.0","type":"link"}