{"product_id":"carbon-steel-square-tubing-1-25in-x-3-16in-wall-x-48in-structural","title":"Carbon Steel Square Tubing 1.25in x 3\/16in Wall x 48in - Structural","description":"\u003cp\u003eIn this review of the OnlineMetals A500\/A513 carbon steel square tubing, the bottom line is simple: this is a dependable, modifiable structural bar for fabricators and hobbyists who need a heavy-duty 4 ft section of steel that can be welded, cut, or drilled without fuss. The reviewer found its chief appeal to be straightforward strength and versatility for small frames, machine supports, and architectural mockups, while noting that surface rust control can vary in field conditions.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n \u003cli\u003e\n\u003cstrong\u003eHigh-strength carbon steel:\u003c\/strong\u003e Provides the structural rigidity required for frames and supports in both commercial and hobbyist projects.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003e1.25in height with 3\/16in wall:\u003c\/strong\u003e The wall thickness balances strength and machinability, making it easy to weld and bolt into assemblies.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003e48in length:\u003c\/strong\u003e A convenient 4 ft stick that reduces scrap and fits common workshop needs without special cutting for many projects.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eReady for modification:\u003c\/strong\u003e Uncoated finish accepts welding, drilling, and cutting so fabricators can tailor pieces precisely to design plans.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eDurable and recyclable:\u003c\/strong\u003e Engineered to resist wear and recyclable at end of life, offering long-term value and reduced material waste.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eMultipurpose fit:\u003c\/strong\u003e Works with standard tube connectors and fittings used in machine fabrication, model builds, and separator systems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThe tubing is best suited to metalworkers, small fabricators, and engineers building light to medium structural frameworks, machine supports, or architectural accents where a 1.25in square profile and 3\/16in wall are appropriate. Hobbyists who need a robust, modifiable raw material for fixtures and model material projects will also appreciate the ready-to-machine finish.\u003c\/p\u003e\n\u003cp\u003eIt is less appropriate for applications that demand a finished, stainless surface or tight cosmetic tolerance straight from the supplier; anyone needing mill-scale-free or pretreated corrosion protection should plan to apply a coating or source a different finish.\u003c\/p\u003e\n\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n \u003cli\u003eSolid structural performance for frames and supports thanks to the carbon steel composition.\u003c\/li\u003e\n \u003cli\u003eConvenient 48in length reduces the need for joining short pieces in many builds.\u003c\/li\u003e\n \u003cli\u003eUncoated surface is easy to weld, cut, and drill for custom work.\u003c\/li\u003e\n \u003cli\u003eGood value for material buyers needing usable shop-ready steel stock.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n \u003cli\u003eSurface rust resistance is mixed in user reports, so additional coating may be required for outdoor or corrosive environments.\u003c\/li\u003e\n \u003cli\u003eNot a stainless or decorative finish; cosmetic work is needed when appearance matters.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n \u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eCarbon steel (ASTM A-36 \/ A500\/A513 implied)\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\u003eHeight\u003c\/td\u003e\n\u003ctd\u003e1.25in\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eWall thickness\u003c\/td\u003e\n\u003ctd\u003e3\/16in\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e48in\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eFinish\u003c\/td\u003e\n\u003ctd\u003eHot rolled, uncoated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe OnlineMetals carbon steel square tubing is a practical choice for fabricators and hobbyists who need a sturdy, modifiable 4 ft section for structural builds. It delivers reliable strength and workshop-ready machinability at a sensible value, though buyers should plan surface protection if the project will face moisture or require a finished appearance.\u003c\/p\u003e\n\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 carbon steel is suitable for standard welding methods and accepts drilling and cutting for joins and fixtures.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs the tubing corrosion resistant?\u003c\/strong\u003e\u003cbr\u003eThe tubing is engineered to resist wear but is uncoated; customer reports on rust vary, so apply a protective coating for outdoor or corrosive environments.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill it fit common tube connectors?\u003c\/strong\u003e\u003cbr\u003eYes. The 1.25in square profile and 3\/16in wall thickness are compatible with many standard tube connectors and fittings used in machine and frame assemblies.\u003c\/p\u003e","brand":"Online Metals","offers":[{"title":"Default Title","offer_id":48226151235803,"sku":"B000H9PGHQ","price":87.35,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/51mvzNj-mjL._AC_SL1000_d0ebdb0b-03db-48b5-ac83-9daf34462173.jpg?v=1770719287","url":"https:\/\/gearmusthave.com\/products\/carbon-steel-square-tubing-1-25in-x-3-16in-wall-x-48in-structural","provider":"GearMustHave","version":"1.0","type":"link"}