{"product_id":"imscrews-5-16-x-3-1-2-hex-head-lag-screws-304-stainless-steel-partially-threaded-structural-timber-bolts-10-pcs","title":"IMSCREWS 5\/16  x 3-1\/2  Hex Head Lag Screws, 304 Stainless Steel, Partially Threaded Structural Timber Bolts, 10   pcs","description":"\u003cp\u003e\"\u003cstrong\u003eIMSCREWS 5\/16 x 3-1\/2 Heavy-Duty Lag Screws - 304 Stainless Steel (10 pcs)\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eDeep Reach for Structural Timber Connections\u003c\/strong\u003e\u003cbr\u003eWhen your project demands deep penetration and unyielding holding power, these 3.5-inch lag bolts provide the industrial strength needed. Optimized for securing deck railing posts, heavy gate frames, or structural brackets to 4x4 posts. The 5\/16 diameter offers elite shear resistance for critical load-bearing joints.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eVise-Like Clamping with Partial Threading\u003c\/strong\u003e\u003cbr\u003eOur \u003cstrong\u003epartially threaded shank\u003c\/strong\u003e features a smooth upper section that allows the bolt to pull the outer timber tightly against the support beam. This creates a gap-free, rock-solid joint, eliminating the bridging effect where boards remain loose—a common failure in long full-thread screws for structural framing.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003e304 Stainless Exterior Defense\u003c\/strong\u003e\u003cbr\u003eForged from premium 18-8 (304) Stainless Steel for ultimate weather resistance. compatible with \u003cstrong\u003eACQ pressure-treated lumber\u003c\/strong\u003e. Resists rust in humid environments and prevents unsightly rust streaks on high-value cedar, redwood, or deck framing.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eTechnical FAQ\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e¡ñ Tools Required:\u003c\/strong\u003e Fits a standard \u003cstrong\u003e1\/2 hex socket\u003c\/strong\u003e or wrench.\u003cbr\u003e\u003cstrong\u003e¡ñ Pre-drilling:\u003c\/strong\u003e Recommended to prevent timber splitting. Use a 3\/16 bit for softwoods or 7\/32 bit for hardwoods.\u003cbr\u003e\u003cstrong\u003e¡ñ Why 3-1\/2 length?\u003c\/strong\u003e Perfect for passing through 1.5 or 2 timber with a deep 1.5 + thread anchor in the base post.\u003cbr\u003e\u003cstrong\u003e¡ñ Resilience:\u003c\/strong\u003e Rated for marine, coastal, and high-humidity environments.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003cbr\u003e- Size: 5\/16 x 3-1\/2 \u003cbr\u003e- Thread: Partially Threaded (Max Clamping)\u003cbr\u003e- Material: 304 Stainless Steel (18-8)\u003cbr\u003e- Drive: 1\/2 Hex Head\u003cbr\u003e- Qty: 10 pcs\"\u003c\/p\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eELITE CLAMPING POWER  The partially threaded design ensures the smooth shank stays in the outer board, allowing the threads to pull timber members together with immense force for a gap-free joint.\u003c\/li\u003e\n\u003cli\u003eIDEAL FOR 2x4 TO POSTS  At 3.5 inches long, these screws provide the perfect structural anchoring depth for connecting standard 2x lumber to 4x4 or 6x6 posts without over-penetration.\u003c\/li\u003e\n\u003cli\u003e304 EXTERIOR DEFENSE  Forged from premium 304 (18-8) stainless steel to prevent rust and staining in cedar, redwood, or ACQ pressure-treated lumber projects.\u003c\/li\u003e\n\u003cli\u003eSTABLE TORQUE INTERFACE  Precision-forged hex head fits 1\/2  sockets securely, offering stable torque transfer for controlled, slip-free seating even in dense timber cores.\u003c\/li\u003e\n\u003cli\u003eTECHNICAL SPECIFICATION  To prevent timber splitting from the robust 5\/16  diameter, pre-drilling a pilot hole (7\/32  for softwoods, 1\/4  for hardwoods) is mandatory.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eASIN:\u003c\/strong\u003e B0F21CDVZ2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInternal SKU:\u003c\/strong\u003e IMS0646\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 5\/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 Hex\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":57034526425254,"sku":"B0F21CDVZ2","price":8.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0271\/2784\/0903\/files\/41keW3A_9kL_977227bd-132f-4eb2-a1e7-d0288d465cef.jpg?v=1787035617","url":"https:\/\/www.imscrews.com\/products\/imscrews-5-16-x-3-1-2-hex-head-lag-screws-304-stainless-steel-partially-threaded-structural-timber-bolts-10-pcs","provider":"IMSCREWS","version":"1.0","type":"link"}