{"product_id":"3-8-in-x-8-in-black-carriage-bolt-kit-ceramic-coated-for-exterior","title":"3\/8 in x 8 in Black Carriage Bolt Kit - Ceramic Coated for Exterior","description":"\u003cp\u003eOur review of this 3\/8 in x 8 in carriage bolt kit finds it best suited for outdoor projects where corrosion resistance and a semi-flush finish matter. The kit includes 25 Grade 307A carriage bolts, USS flat washers, and grade 2 hex nuts, all finished with a 5-layer ceramic black ruspert coating that claims roughly twice the rust protection of standard galvanized hardware. For builders fitting decks, pergolas, gazebos or bolting structural elements of small dwellings, the combination of length, head size and corrosion-focused finish is the single biggest reason to consider this kit.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete 25-piece kit:\u003c\/strong\u003e Comes with 25 carriage bolts, 25 USS thick washers and 25 hex nuts so a typical small decking or pavilion run can be fitted without sourcing extra fasteners.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e5-layer ceramic black ruspert coating:\u003c\/strong\u003e Provides enhanced rust resistance for exterior use and improves appearance on visible outdoor structures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrade 307A bolts:\u003c\/strong\u003e The specified bolt grade gives reliable shear and tensile performance for many heavy duty outdoor applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSemi-flush flat head:\u003c\/strong\u003e The carriage bolt head diameter and flat profile deliver a restrained, semi-flush finish ideal for decks, pergolas and gazebos.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard hardware sizes:\u003c\/strong\u003e 3\/8 in diameter and 8 in length with a 9\/16 in nut wrench size makes these easy to install with common tools.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWasher and nut match:\u003c\/strong\u003e USS thick washers and grade 2 hex nuts are included to distribute load and secure the connection without extra purchases.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis kit is for DIYers and contractors installing outdoor structures like decks, pergolas, gazebos or small cabins who want a consistent, black finish and improved corrosion resistance over plain galvanized fasteners. The 8 in length and 3\/8 in diameter suit through-bolting tasks where a carriage head and washer are required for a neat, semi-flush look.\u003c\/p\u003e\n\u003cp\u003eThose who need specialty high-strength fasteners or stainless steel for extreme coastal corrosion should look elsewhere; if maximum marine-grade corrosion resistance is required, stainless options are preferable. Also, projects needing metric sizes or lengths other than 8 in will need different kits.\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 value: a full set of bolts, washers and nuts reduces the need to buy components separately.\u003c\/li\u003e\n\u003cli\u003eBetter rust protection: the five-layer ceramic black ruspert finish offers improved outdoor durability compared with standard galvanized finishes.\u003c\/li\u003e\n\u003cli\u003eClean look: semi-flush flat head and black coating provide an attractive finished appearance on visible structures.\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 mixed in practice: some customers reported variable long-term rust performance depending on exposure conditions.\u003c\/li\u003e\n\u003cli\u003eNot stainless: for extreme marine environments, this coated carbon option is less durable than stainless steel.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e3\/8 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e8 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHead diameter\u003c\/td\u003e\n\u003ctd\u003e0.813 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNut wrench size\u003c\/td\u003e\n\u003ctd\u003e9\/16 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWasher outside diameter\u003c\/td\u003e\n\u003ctd\u003e1 in (USS thick)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eKit contents\u003c\/td\u003e\n\u003ctd\u003e25 carriage bolts, 25 USS flat washers, 25 grade 2 hex nuts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoating\u003c\/td\u003e\n\u003ctd\u003e5-layer ceramic black ruspert\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe 3\/8 in x 8 in carriage bolt kit is a practical, cost-effective choice for outdoor builds that need a clean, semi-flush finish and better-than-galvanized corrosion protection. It is especially good for decks, pergolas and gazebos where appearance and a complete matched kit matter; choose stainless if you need marine-grade durability.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eAre these bolts suitable for exterior use?\u003c\/strong\u003e\u003cbr\u003eYes, they are coated with a 5-layer ceramic black ruspert finish designed to improve rust resistance for exterior applications.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat tools are needed to install them?\u003c\/strong\u003e\u003cbr\u003eA 9\/16 in wrench or socket for the hex nut and standard drill or holesaw to accommodate a 3\/8 in bolt will be sufficient.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo the kits include washers and nuts?\u003c\/strong\u003e\u003cbr\u003eYes, each kit includes 25 USS thick washers and 25 grade 2 hex nuts matched to the carriage bolts.\u003c\/p\u003e","brand":"Makers Bolt","offers":[{"title":"Default Title","offer_id":48615725859035,"sku":"B0CSTBVGKM","price":46.61,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/51_1IpyozJL._SL1500_992dd912-b12f-43db-ac97-0fcc961d3af5.jpg?v=1778416166","url":"https:\/\/gearmusthave.com\/products\/3-8-in-x-8-in-black-carriage-bolt-kit-ceramic-coated-for-exterior","provider":"GearMustHave","version":"1.0","type":"link"}