{"product_id":"construction-lag-screw-5-16in-x-16in-type-17-heavy-duty","title":"Construction Lag Screw 5\/16in x 16in Type 17 - Heavy Duty","description":"\u003cp\u003eIn this review the reviewer focuses on a heavy duty construction lag screw intended for outdoor structural work; the bottom line is straightforward: this set is for builders and DIYers who need dependable long fasteners that resist corrosion and drive quickly. The most convincing reason to buy is the combination of a \u003cstrong\u003eType 17 notched point\u003c\/strong\u003e for quick starts and a proven triple coating that passed a 1200 hour salt spray test, which together mean fewer broken starters and long life in ACQ treated lumber.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize and fit:\u003c\/strong\u003e The roughly 5\/16in thread diameter and 16in length make these screws suitable for joining large dimensional lumber where deep penetration and clamping force are required.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType 17 point:\u003c\/strong\u003e The notched extra sharp point reduces walking and often removes the need for pre-drilling, speeding up layout and installation on deck and pergola posts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeat treated strength:\u003c\/strong\u003e Manufactured from high quality heat treated steel, these lag screws offer superior shear and compression performance compared with standard lag bolts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorrosion protection:\u003c\/strong\u003e A triple coating passed the 1200 hour salt spray test without coating failures, which increases longevity in exterior and ACQ treated lumber applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrive system:\u003c\/strong\u003e Torx\/Star drive provides more bit engagement and reduces cam-out during high-torque installation compared with slotted or Phillips heads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWasher head:\u003c\/strong\u003e The modified truss washer head improves bearing area and helps pull framing members tighter for stronger joints.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis product is aimed at contractors, deck builders, and serious DIYers who work with large timber like 4x6s or 6x6s and need deep, reliable fasteners for structural connections. The combination of heat treated steel and heavy corrosion coating makes it appropriate for outdoor projects and for use with ACQ treated lumber.\u003c\/p\u003e\n\u003cp\u003eThose who should look elsewhere include people needing short screws for trim work or applications where a finished countersunk head is required; this is a structural lag intended for pull-down strength rather than finish carpentry.\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\u003eHigh strength from heat treated steel provides superior shear and compression performance for structural joints.\u003c\/li\u003e\n\u003cli\u003eType 17 notched point and Torx drive reduce walking and make starts faster with less pre-drilling needed.\u003c\/li\u003e\n\u003cli\u003eTriple coating that passed extended salt spray testing offers excellent corrosion resistance for exterior use.\u003c\/li\u003e\n\u003cli\u003eModified truss washer head increases bearing area and helps pull lumber tight for secure connections.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eLength and heavy duty design make these unsuitable for trim or finish work where a smaller or countersunk screw is required.\u003c\/li\u003e\n\u003cli\u003eSpecialized fastener may require the correct Torx bit and proper installation torque for best performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eThread diameter\u003c\/td\u003e\n\u003ctd\u003e~5\/16in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e16in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHead diameter\u003c\/td\u003e\n\u003ctd\u003e11\/16in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePoint type\u003c\/td\u003e\n\u003ctd\u003eType 17 notched extra sharp point\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDrive type\u003c\/td\u003e\n\u003ctd\u003eTorx\/Star drive\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial and finish\u003c\/td\u003e\n\u003ctd\u003eHeat treated steel, triple coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCorrosion test\u003c\/td\u003e\n\u003ctd\u003ePassed 1200 hour salt spray without coating failures\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe construction lag screw is a solid choice for anyone building decks, pergolas, or heavy timber frames where long reach, strong shear capacity, and corrosion resistance matter. It offers clear value for exterior structural work thanks to the Type 17 point that reduces pre-drilling and the robust coating that stands up to treated lumber and marine-adjacent conditions.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eDo these screws work with ACQ treated lumber?\u003c\/strong\u003e\u003cbr\u003eYes. The triple coating and material choice make them compatible with ACQ treated lumber to resist corrosion.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill I need to pre-drill pilot holes?\u003c\/strong\u003e\u003cbr\u003eThe Type 17 notched point reduces the need for pre-drilling in many situations, though very dense hardwoods or precise alignment may still benefit from pilot holes.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat driver bit should I use?\u003c\/strong\u003e\u003cbr\u003eUse a Torx\/Star driver bit sized to the head to minimize cam-out and to apply proper torque during installation.\u003c\/p\u003e","brand":"Jake Sales","offers":[{"title":"Default Title","offer_id":48636536029403,"sku":"B07ZWM6WMH","price":460.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/61drf1ePBTL._SL1500.jpg?v=1778556847","url":"https:\/\/gearmusthave.com\/products\/construction-lag-screw-5-16in-x-16in-type-17-heavy-duty","provider":"GearMustHave","version":"1.0","type":"link"}