{"product_id":"imscrews-5-16-18-x-3-1-4-carriage-bolts-304-stainless-steel-18-8-round-head-square-neck-full-thread-pack-of-10","title":"IMSCREWS 5\/16-18 x 3-1\/4 Carriage Bolts, 304 Stainless Steel 18-8, Round Head \u0026 Square Neck, Full Thread, Pack of 10","description":"\u003cp\u003e\u003cstrong\u003eIMSCREWS 5\/16\"-18 x 3-1\/4\" Heavy-Duty 304 Stainless Steel Carriage Bolts (10 PCS)\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eSubstantial Support for Deep Structural Timber Connections\u003c\/strong\u003e\u003cbr\u003eThe IMSCREWS 5\/16\" x 3-1\/4\" carriage bolt is engineered for projects requiring deep penetration and reliable structural support. With a robust 5\/16-inch diameter and an extended 3.25-inch length, these bolts are well-suited for high-load joints where stability is critical, such as through-bolting multiple layers of dimensional lumber or reinforcing heavy-duty deck-to-post connections. Built for durability, they offer the stability necessary for long-term use in outdoor structures and residential DIY projects.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eHigh Durability and Safety-Focused Design\u003c\/strong\u003e\u003cbr\u003eForged from premium 18-8 (304) stainless steel, these fasteners are highly resistant to rust and corrosion in coastal or humid environments. The smooth round head offers a \u003cstrong\u003eclean\u003c\/strong\u003e appearance that reduces snagging hazards, making them an \u003cstrong\u003eideal\u003c\/strong\u003e choice for railings, play sets, and benches. The integrated square neck prevents rotation, allowing for easy, one-sided installation with a single wrench from the nut side.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003cbr\u003e- Thread: 5\/16\"-18 Coarse; Length: 3-1\/4\" (Under Head)\u003cbr\u003e- Material: 304 (18-8) Stainless Steel; Full Thread\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003ePro-Tips:\u003c\/strong\u003e\u003cbr\u003e1. Use a 5\/16\" drill bit to ensure a \u003cstrong\u003esnug\u003c\/strong\u003e, structural fit for the square neck.\u003cbr\u003e2. Pair with stainless steel flat washers on the nut side to distribute structural load and protect wood fibers.\u003c\/p\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eSelf-Locking Square Neck: Features a precision-engineered square neck beneath the head that bites into wood, preventing the bolt from spinning while the nut is tightened for easy, one-sided installation.\u003c\/li\u003e\n\u003cli\u003eFull Thread Maximum Grip: The fully threaded 3-1\/4 shank provides maximum grip and enhanced fastening power along its entire length, making it ideal for deep timber and structural projects.\u003c\/li\u003e\n\u003cli\u003e304 Marine Grade Stainless: Forged from premium 18-8 (304) Stainless Steel for superior corrosion defense. Essential for docks, coastal decks, and ACQ pressure-treated lumber.\u003c\/li\u003e\n\u003cli\u003eHeavy-Duty Structural Strength: The 5\/16 diameter delivers professional-grade shear resistance. At 3.25 long, these bolts are Well-suited for through-bolting thick posts and heavy structural framing.\u003c\/li\u003e\n\u003cli\u003eSnag-Free Aesthetic Finish: The smooth, domed round head provides a professional finish without sharp edges, ensuring safety for playground equipment, fencing, and furniture.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eASIN:\u003c\/strong\u003e B0F2F61PC8\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInternal SKU:\u003c\/strong\u003e IMS0811\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 5\/16\"-18 x 3-1\/4\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Stainless Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Stainless Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHead Style:\u003c\/strong\u003e Round\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 10\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"IMSCREWS","offers":[{"title":"Default Title","offer_id":57034019963046,"sku":"B0F2F61PC8","price":10.49,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0271\/2784\/0903\/files\/51ZaVl7AlSL_fe2422fb-f1e1-44ec-a895-7fe0731866bb.jpg?v=1787034828","url":"https:\/\/www.imscrews.com\/ru\/products\/imscrews-5-16-18-x-3-1-4-carriage-bolts-304-stainless-steel-18-8-round-head-square-neck-full-thread-pack-of-10","provider":"IMSCREWS","version":"1.0","type":"link"}