{"product_id":"carbon-steel-square-tubing-4-in-x-3-16-in-x-48-in-strong-structural","title":"Carbon Steel Square Tubing 4 in x 3\/16 in x 48 in - Strong Structural","description":"\u003cp\u003eIn this review the OnlineMetals A500\/A513 carbon steel square tubing is examined for builders and metalworkers who need a straightforward, modifiable structural section. The bottom line: this 4 in by 3\/16 in wall, 48 in length square tube offers reliable strength and a useful blank canvas for welding, drilling, and cutting, making it a practical choice for frame work and machine supports where consistent steel performance is the priority. Its combination of size, wall thickness, and uncoated surface makes it easy to adapt for a wide range of projects.\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 Provides the rigidity and load-bearing capacity expected for frameworks and machine supports in both commercial and hobby projects.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4 in height:\u003c\/strong\u003e The 4 in outer dimension is large enough for substantial structural layouts while remaining manageable for handling and fabrication.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3\/16 in wall thickness:\u003c\/strong\u003e A mid-range wall thickness that balances weight and strength for welded frames and connector fittings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e48 in length:\u003c\/strong\u003e A 4 ft stick reduces the need for splicing in many small-to-medium builds and is convenient for transport and storage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReady for modification:\u003c\/strong\u003e Uncoated surface accepts welding, drilling, cutting, and machining without interference from factory finishes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable and recyclable:\u003c\/strong\u003e Engineered for wear resistance and long service life while remaining recyclable at end of use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis square tubing is aimed at fabricators, machinists, and hobbyists who need a predictable piece of raw steel for structural tasks such as machine bases, frames, fencing supports, or architectural accents. Its ready-to-work surface and standard 48 in length suit shop environments where cutting and welding are part of the workflow.\u003c\/p\u003e\n\u003cp\u003eThose who need pre-finished, stainless, or corrosion-guaranteed tubing for outdoor installations with long-term exposure may want to look at purpose-coated or stainless alternatives; users concerned about immediate rust resistance should plan protective painting or galvanizing after final fabrication.\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 material quality and dimensional accuracy for structural applications.\u003c\/li\u003e\n\u003cli\u003eUncoated, easy to weld and drill for custom fabrications and modifications.\u003c\/li\u003e\n\u003cli\u003eHandy 4 ft length minimizes joins for many shop projects.\u003c\/li\u003e\n\u003cli\u003eRecyclable and engineered for wear resistance, supporting longer 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\u003eRust resistance is mixed in customer reports, so exterior use will likely require additional corrosion protection.\u003c\/li\u003e\n\u003cli\u003eUncoated finish means buyers must apply protective coatings for long-term outdoor exposure.\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 \/ A500\/A513)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShape\u003c\/td\u003e\n\u003ctd\u003eSquare tubing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter height\u003c\/td\u003e\n\u003ctd\u003e4 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWall thickness\u003c\/td\u003e\n\u003ctd\u003e3\/16 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\u003eThe OnlineMetals carbon steel square tubing is a practical, no-frills choice for fabricators who need a strong, modifiable structural member in a 4 ft length. It delivers solid value for shop projects and machine supports when buyers are prepared to apply surface protection for outdoor use, making it a sensible purchase for most builders and hobbyists.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this tubing ready to weld right away?\u003c\/strong\u003e\u003cbr\u003eYes. The tubing is uncoated and designed to be welded, drilled, and cut without additional preparation beyond normal shop cleaning.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill it rust if used outdoors?\u003c\/strong\u003e\u003cbr\u003eUntreated carbon steel can show corrosion over time; apply paint, galvanizing, or other protection for prolonged outdoor exposure.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs the length suitable for small frames?\u003c\/strong\u003e\u003cbr\u003eThe 48 in length is convenient for many small-to-medium frames and reduces the need for splices in typical shop projects.\u003c\/p\u003e","brand":"Online Metals","offers":[{"title":"Default Title","offer_id":48199778894043,"sku":"B000H9M2TQ","price":92.72,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/51mvzNj-mjL._AC_SL1000_6c89106b-24f6-4c74-811e-c0ce21a82938.jpg?v=1770234715","url":"https:\/\/gearmusthave.com\/products\/carbon-steel-square-tubing-4-in-x-3-16-in-x-48-in-strong-structural","provider":"GearMustHave","version":"1.0","type":"link"}