{"product_id":"spax-1-4-in-x-3-1-2-in-powerlag-t-star-washer-head-screws-heavy-duty","title":"SPAX 1\/4 in x 3-1\/2 in PowerLag T-Star Washer Head Screws - Heavy Duty","description":"\u003cp\u003eIn this review of the SPAX 1\/4 in x 3-1\/2 in PowerLag screws the bottom line is simple: these are for builders and serious DIYers who need a reliable structural wood fastener that installs cleanly and holds well. The reviewer found the low profile washer head and patented thread design deliver consistent draw down with less splitting, and the included T-Star bit plus heat treated Grade 5 construction make these a dependable choice for exterior and treated lumber projects.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eT-Star drive:\u003c\/strong\u003e The 6-lobe T-Star drive gives superior bit engagement so screws install faster and with less cam-out, improving productivity on long runs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWasher head design:\u003c\/strong\u003e The built-on low profile washer head provides strong clamping without a separate washer and leaves a neater finished surface on visible wood connections.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeat treated Grade 5:\u003c\/strong\u003e Heat treatment increases toughness and reduces breakage, giving confidence when setting long structural fasteners into dense or treated lumber.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePatented thread technology:\u003c\/strong\u003e Threads are engineered to drive more quickly and reduce splitting in wood, which simplifies installation and preserves timber integrity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorrosion resistant coating:\u003c\/strong\u003e Coated carbon steel construction is suitable for exterior applications and treated lumber, extending service life outdoors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBit included:\u003c\/strong\u003e The pail includes a compatible bit so the set is ready to use with an impact driver right away.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThese screws are aimed at professional carpenters, deck builders, and experienced DIYers who need structural wood-to-wood connections that resist pullout in exterior and pressure-treated applications. The combination of washer head clamping and the T-Star drive is most valuable when many fasteners must be installed quickly and reliably.\u003c\/p\u003e\n\u003cp\u003eThose working on very fine finish carpentry where countersinking or a different head style is required may want a different fastener, and if you need stainless steel for corrosive coastal environments a marine-grade screw is a better choice.\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\u003eExcellent draw down and clamping from the integrated washer head for strong joints.\u003c\/li\u003e\n\u003cli\u003eReduced driving torque and better bit engagement thanks to the T-Star drive, making impact driving easier.\u003c\/li\u003e\n\u003cli\u003eHeat treated Grade 5 construction offers higher strength and lower breakage risk during installation.\u003c\/li\u003e\n\u003cli\u003eWorks well in treated lumber and exterior applications with corrosion resistant coating.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eNot stainless steel, so users in harsh coastal environments should choose a marine-grade fastener instead.\u003c\/li\u003e\n\u003cli\u003eThe low profile washer head is specific; projects requiring countersunk heads will need a different screw type.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eAltenloh, Brink \u0026amp; Co (SPAX)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e1\/4 in x 3-1\/2 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHead type\u003c\/td\u003e\n\u003ctd\u003eWasher head, low profile\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDrive\u003c\/td\u003e\n\u003ctd\u003eT-Star 6-lobe (bit included)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial \u0026amp; finish\u003c\/td\u003e\n\u003ctd\u003eCarbon steel, corrosion resistant coating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDurability\u003c\/td\u003e\n\u003ctd\u003eHeat treated Grade 5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCode recognition\u003c\/td\u003e\n\u003ctd\u003eICC-ES Report ESR-1783 for structural wood to wood\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eFor anyone fastening structural wood in exterior or treated lumber projects, these SPAX PowerLag screws are a practical, value-oriented choice because they combine strong clamping, reduced driving torque, and tougher heat treated steel. The included bit and code recognition make them ready for jobsite use and a smart pick when consistent performance and pullout resistance matter.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eAre these suitable for treated lumber?\u003c\/strong\u003e\u003cbr\u003eYes, the screws are manufactured for use in treated lumber and exterior applications and are ICC-ES recognized for structural wood to wood uses.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat driver bit do I need?\u003c\/strong\u003e\u003cbr\u003eThe screws use a T-Star 6-lobe drive and the compatible bit is included in the pail for immediate use with an impact driver.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre these stainless steel?\u003c\/strong\u003e\u003cbr\u003eNo, they are carbon steel with a corrosion resistant coating and heat treated for strength; choose stainless or marine-grade fasteners for extreme saltwater exposure.\u003c\/p\u003e","brand":"Altenloh, Brink \u0026 Co","offers":[{"title":"Default Title","offer_id":48193218085083,"sku":"B018JQFDJE","price":25.19,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/41Mhc_j2cYL._SL1500_f8acaaf5-6ff2-417a-b576-cc782131b8e3.jpg?v=1770215096","url":"https:\/\/gearmusthave.com\/products\/spax-1-4-in-x-3-1-2-in-powerlag-t-star-washer-head-screws-heavy-duty","provider":"GearMustHave","version":"1.0","type":"link"}