{"product_id":"imscrews-3-8-16-x-3-1-2-carriage-bolts-304-stainless-steel-18-8-round-head-square-neck-full-thread-pack-of-2","title":"IMSCREWS 3\/8-16 x 3-1\/2 Carriage Bolts, 304 Stainless Steel 18-8, Round Head \u0026 Square Neck, Full Thread, Pack of 2","description":"\u003cp\u003e\u003cstrong\u003eIMSCREWS 3\/8\"-16 x 3-1\/2\" Heavy-Duty 304 Stainless Steel Carriage Bolts (2 PCS)\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eSubstantial Support for Deep Structural Connections\u003c\/strong\u003e\u003cbr\u003eThe IMSCREWS 3\/8\" x 3-1\/2\" carriage bolt is engineered for projects requiring deep penetration and stable structural support. With a robust 3\/8-inch diameter and a 3.5-inch length, these bolts are well-suited for high-load joints, such as through-bolting standard 4x4 posts or reinforcing deck-to-post connections. Built for durability, they offer the stability necessary for long-term use in outdoor structures, gazebos, and industrial garden projects.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eHigh Durability and Safety-Focused Design\u003c\/strong\u003e\u003cbr\u003eForged from 18-8 (304) stainless steel, these fasteners are highly resistant to corrosion in outdoor environments and are compatible with pressure-treated lumber. 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: 3\/8\"-16 Coarse; Length: 3-1\/2\" (Under Head)\u003cbr\u003e- Material: 304 (18-8) Stainless Steel; Full Thread\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eFAQ:\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eQ: Drill bit size?\u003c\/strong\u003e A: A 3\/8\" bit provides a \u003cstrong\u003esnug\u003c\/strong\u003e, structural fit.\u003cbr\u003e\u003cstrong\u003eQ: Coastal safe?\u003c\/strong\u003e A: Yes, 304 SS offers high resistance to salt air corrosion.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003ePro-Tips:\u003c\/strong\u003e\u003cbr\u003e1. Ensure the pilot hole is perfectly perpendicular for 3.5\" bolts to avoid alignment issues in thick timber.\u003cbr\u003e2. Pair with a heavy-duty flat washer 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: Engineered with a precision-forged square neck beneath the head that bites into wood or locks into square metal holes, preventing the bolt from spinning while the nut is tightened for a secure, one-sided install.\u003c\/li\u003e\n\u003cli\u003eFull Thread Maximum Grip: The fully threaded shank provides maximum grip and enhanced fastening power along the entire 3.5-inch length, making it ideal for deep timber connections and heavy-duty structural DIY projects.\u003c\/li\u003e\n\u003cli\u003e304 Marine Grade Stainless: Forged from premium 18-8 (304) Stainless Steel for superior corrosion defense. Essential for outdoor structures, coastal decks, docks, and ACQ pressure-treated lumber applications.\u003c\/li\u003e\n\u003cli\u003eExtended Structural Strength: The 3\/8 diameter delivers professional-grade shear resistance. At 3.5 long, these bolts are Well-suited for through-bolting thick posts, beams, and heavy structural timber framing.\u003c\/li\u003e\n\u003cli\u003eSnag-Free Aesthetic Finish: The smooth, domed round head provides a professional, low-profile finish without sharp edges, ensuring safety and aesthetics for fencing, outdoor furniture, and playground equipment.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eASIN:\u003c\/strong\u003e B0F2F6652D\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInternal SKU:\u003c\/strong\u003e IMS0858\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 3\/8\"-16 x 3-1\/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 2\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"IMSCREWS","offers":[{"title":"Default Title","offer_id":57034024583334,"sku":"B0F2F6652D","price":6.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0271\/2784\/0903\/files\/51ZaVl7AlSL_3ea32965-eef5-4dea-8f55-c5293b871fc7.jpg?v=1787034901","url":"https:\/\/www.imscrews.com\/ru\/products\/imscrews-3-8-16-x-3-1-2-carriage-bolts-304-stainless-steel-18-8-round-head-square-neck-full-thread-pack-of-2","provider":"IMSCREWS","version":"1.0","type":"link"}