{"product_id":"imscrews-5-16-18-x-4-1-2-heavy-duty-carriage-bolts-304-stainless-steel-18-8-full-thread-structural-coach-bolts-for-thick-posts-beams-10-pcs","title":"IMSCREWS 5\/16-18 x 4-1\/2 Heavy-Duty Carriage Bolts, 304 Stainless Steel (18-8), Full Thread Structural Coach Bolts for Thick Posts \u0026 Beams, 10 PCS","description":"\u003cp\u003e\u003cstrong\u003eIMSCREWS 5\/16\"-18 x 4-1\/2\" Heavy-Duty 304 Stainless Steel Carriage Bolts (10 PCS)\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eSubstantial Support for Deep Structural Connections\u003c\/strong\u003e\u003cbr\u003eThe IMSCREWS 5\/16\" x 4-1\/2\" carriage bolt is engineered for heavy-duty projects requiring deep penetration and reliable structural support. With a robust 5\/16-inch diameter and an extended 4.5-inch length, these bolts are well-suited for high-load joints where stability is critical, such as through-bolting standard 4x4 posts (3.5\" actual) with additional metal brackets or thick timber layers. Built for durability, they offer the stability necessary for long-term use in outdoor structures, garden gazebos, and industrial woodworking 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: 4-1\/2\" (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\u003eExtra-Long Structural Reach: The 4.5-inch length is specifically engineered for through-bolting thick structural posts and multi-layer timber beams, providing the reach needed for heavy framing.\u003c\/li\u003e\n\u003cli\u003eFull-Thread Maximum Tension: Featuring a precision-cut full thread, these bolts ensure consistent clamping force and superior pull-out resistance throughout the entire deep-hole installation.\u003c\/li\u003e\n\u003cli\u003eOutdoor-Ready 304 Stainless: Forged from 18-8 (304) stainless steel to withstand harsh weather and high humidity. Ideal for ACQ pressure-treated lumber, prevent rust streaks and degradation.\u003c\/li\u003e\n\u003cli\u003eAnti-Spin Square Neck: The integrated square neck beneath the round head bites firmly into wood fibers, locking the bolt in place for effortless, one-sided installation without a second wrench.\u003c\/li\u003e\n\u003cli\u003eSmooth, Safe Finish: The domed round head provides a professional, snag-free finish without sharp edges¡ªessential for the safety of public decks, playground equipment, and outdoor furniture.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eASIN:\u003c\/strong\u003e B0F2FDHYZX\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInternal SKU:\u003c\/strong\u003e IMS0821\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 5\/16\"-18 x 4-1\/2\"\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":57034021503142,"sku":"B0F2FDHYZX","price":9.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0271\/2784\/0903\/files\/51ZaVl7AlSL_7e5637a4-0eeb-440d-a711-8586b6b9c376.jpg?v=1787034840","url":"https:\/\/www.imscrews.com\/ru\/products\/imscrews-5-16-18-x-4-1-2-heavy-duty-carriage-bolts-304-stainless-steel-18-8-full-thread-structural-coach-bolts-for-thick-posts-beams-10-pcs","provider":"IMSCREWS","version":"1.0","type":"link"}