{"product_id":"u-bolt-1-2-in-d-x-3-1-16-in-w-x-4-5-16-in-l-square-304-stainless","title":"U Bolt 1\/2 in D x 3-1\/16 in W x 4-5\/16 in L - Square 304 Stainless","description":"\u003cp\u003eIn this review the focus is on a practical hardware kit for boat trailers and square beam mounting: four 304 stainless steel square U-bolts with matching nuts and washers. The bottom line is simple: this kit is aimed at DIY boat owners, trailer shops, and anyone who needs reliable, corrosion-resistant clamps for 3 in x 3 in square beams. The biggest reason to buy is the 304 stainless construction combined with a full complement of heavy hex nylon lock nuts and washers, which delivers strong, corrosion-resistant clamping at a fraction of typical hardwarestore cost.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e304 stainless steel construction:\u003c\/strong\u003e Provides corrosion resistance suitable for marine environments and long-term outdoor use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExact fit for 3 in square beams:\u003c\/strong\u003e The 3-1\/16 in width is intended for 3 in x 3 in square shafts and beams, making alignment and installation straightforward when measurements match.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete mounting kit:\u003c\/strong\u003e Each set includes four U-bolts plus eight heavy hex stainless nylon lock nuts and a full set of flat and lock washers for secure fastening.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUpgraded thread to reduce seizing:\u003c\/strong\u003e Threads are described as upgraded to resist freezing, which helps during repeated wet\/dry cycles in marine use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLoad support:\u003c\/strong\u003e Each U-bolt is rated in the description to support over 100 lbs per bolt, providing adequate strength for many trailer and accessory attachments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCost effective:\u003c\/strong\u003e The kit offers stainless hardware at roughly half the price of typical retail hardware options, reducing repair and maintenance costs.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis kit suits boat owners, trailer mechanics, and DIYers who need a robust, corrosion-resistant clamp for 3 in square beams, cross members, or shaft mounts. It is particularly useful for shop installation and trailer crane fixes where a matched stainless kit and lockable fasteners are required.\u003c\/p\u003e\n\u003cp\u003eThose who should look elsewhere are buyers who need a precise inch-for-inch fit without measuring first, or users who rely exclusively on high-speed impact tools for installation; manual wrenching is recommended to avoid damage. Also avoid these if you need different dimensions or a different stainless grade than 304.\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\u003eDurable 304 stainless provides strong corrosion resistance for marine use.\u003c\/li\u003e\n\u003cli\u003eComes as a complete kit with nuts, flat washers, and lock washers for immediate installation.\u003c\/li\u003e\n\u003cli\u003eGood value compared with retail hardware, allowing savings on routine repairs.\u003c\/li\u003e\n\u003cli\u003eUpgraded thread helps reduce the chance of seizing in wet environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSome customers report inconsistent thread quality and occasional seized nuts during installation, so inspect threads before use.\u003c\/li\u003e\n\u003cli\u003eInstallation guidance recommends avoiding impact tools and using lubricant, which may add time compared with standard fasteners.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eU-bolt size\u003c\/td\u003e\n\u003ctd\u003e1\/2 in D x 3-1\/16 in W x 4-5\/16 in L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThread length\u003c\/td\u003e\n\u003ctd\u003e2-1\/2 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003e304 stainless steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded hardware\u003c\/td\u003e\n\u003ctd\u003e4 U-bolts, 8 heavy hex nylon lock nuts, 8 flat washers, 8 lock washers\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIntended beam size\u003c\/td\u003e\n\u003ctd\u003e3 in x 3 in square beams\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLoad note\u003c\/td\u003e\n\u003ctd\u003eEach bolt supports over 100 lbs (manufacturer statement)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThis U-bolt kit is a practical choice for boat trailer maintenance and square-beam mounts because it combines marine-grade 304 stainless with a full set of locking hardware at a competitive price. Inspect threads on arrival and use lubricant and hand tools for installation; with those simple precautions it offers good value and reliable corrosion resistance for most trailer and marine accessory needs.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWill these fit a 3 in square trailer crossmember?\u003c\/strong\u003e\u003cbr\u003eYes, the 3-1\/16 in width is designed to fit 3 in x 3 in square beams, but measure first to confirm a correct fit.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre the nuts and bolts stainless steel?\u003c\/strong\u003e\u003cbr\u003eYes, the U-bolts and included heavy hex nuts and washers are 304 stainless steel for corrosion resistance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use an impact wrench to tighten the nuts?\u003c\/strong\u003e\u003cbr\u003eNo, the manufacturer recommends using a manual wrench or socket ratchet and applying lubricant to prevent thread wear and seizing.\u003c\/p\u003e","brand":"Foinwer","offers":[{"title":"Default Title","offer_id":48179821805787,"sku":"B08R8GV572","price":36.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/81vnzwIzGpL._SL1500.jpg?v=1769527817","url":"https:\/\/gearmusthave.com\/products\/u-bolt-1-2-in-d-x-3-1-16-in-w-x-4-5-16-in-l-square-304-stainless","provider":"GearMustHave","version":"1.0","type":"link"}