{"product_id":"1-4-20-x-5-flat-head-floorboard-thread-cutting-screws-durable","title":"1\/4-20 x 5 Flat Head Floorboard Thread Cutting Screws - Durable","description":"\u003cp\u003eIn this review the focus is on a workhorse fastener aimed at mechanics, trailer shops and DIYers who replace or install wood floors in truck trailers. The 1\/4-20 x 5 floorboard screws impressed as a purpose-built solution because their \u003cstrong\u003eself-tapping, thread-cutting design\u003c\/strong\u003e and countersunk flat head deliver a flush, secure hold in hardwood and composite floorboards while cutting threads cleanly into metal substrates beneath. For anyone fastening trailer decks or repairing floorboards where a flush finish and corrosion resistance matter, this product is worth considering.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFloorboard head design:\u003c\/strong\u003e The countersunk flat head provides a flush surface in floor panels so boards lie flat and fasteners do not catch cargo or straps.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread cutting action:\u003c\/strong\u003e These screws cut threads as they drive, making installation into metal stringers and plate beneath wood boards faster and reducing the need for pre-tapping.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSix-lobe T-30 drive:\u003c\/strong\u003e The star six-lobe recess concentrates torque for reliable engagement and reduces stripping during installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlack phosphate and oil finish:\u003c\/strong\u003e The finish offers basic corrosion resistance and the oil aids driveability by lubricating threads for smoother installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlloy steel construction:\u003c\/strong\u003e The material delivers strength and durability suitable for repeated loading and the demanding environment of trailer decks.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCarton quantity:\u003c\/strong\u003e Supplied in a 300 piece carton to cover multiple repairs or a full floor install without repeated orders.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis product is aimed at truck fleet maintenance professionals, trailer rebuild shops and serious DIYers who need heavy-duty fasteners designed specifically for floorboard work. If you are fastening wood floors to steel stringers or plate on trailers, the \u003cstrong\u003eflat head floorboard design\u003c\/strong\u003e and thread-cutting capability make these screws a practical choice.\u003c\/p\u003e\n\u003cp\u003eThose looking for decorative or corrosion-critical fasteners for marine use should look elsewhere; the black phosphate and oil finish provides rust-inhibiting properties but is not a marine-grade coating. Also, if a countersunk stainless option is required for aesthetics or long-term outdoor exposure, consider a stainless alternative.\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\u003eDesigned specifically for floorboard installation so heads sit flush and reduce snagging.\u003c\/li\u003e\n\u003cli\u003eThread-cutting threads perform well into metal backing and cut cleanly as reported by users.\u003c\/li\u003e\n\u003cli\u003eT-30 six-lobe drive gives secure bit engagement and lowers the chance of cam-out.\u003c\/li\u003e\n\u003cli\u003eSupplied in a large carton quantity useful for full deck jobs, offering good value for money.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBlack phosphate with oil is a rust inhibitor but not as corrosion resistant as stainless for harsh marine exposure.\u003c\/li\u003e\n\u003cli\u003eLength and size are specific to trailer floor applications, so may be overkill for light carpentry tasks.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e1\/4-20 x 5 in (measure length from top of head to tip)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHead type\u003c\/td\u003e\n\u003ctd\u003eFlat head countersunk (floorboard)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDrive\u003c\/td\u003e\n\u003ctd\u003eT-30 six-lobe (star)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThread type\u003c\/td\u003e\n\u003ctd\u003eSelf-tapping thread cutting screws\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinish\u003c\/td\u003e\n\u003ctd\u003eBlack phosphate with oil\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eAlloy steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePack\u003c\/td\u003e\n\u003ctd\u003eCarton: 300 pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThese floorboard thread cutting screws are a practical, work-ready choice for trailer deck repair and installation where a flush finish and strong engagement are required. The combination of a countersunk floor head, thread cutting action and T-30 drive makes them durable and easy to install, and the 300 piece carton delivers solid value for tradespeople who service trailers frequently.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eAre these suitable for driving into steel stringers?\u003c\/strong\u003e\u003cbr\u003eYes; the screws are thread cutting and intended to cut threads into metal backing beneath floorboards during installation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow should I measure length?\u003c\/strong\u003e\u003cbr\u003eMeasure from the top of the flat head to the tip to match the listed 1\/4-20 x 5 in length.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill the finish prevent rust long term?\u003c\/strong\u003e\u003cbr\u003eThe black phosphate and oil provide rust inhibition and easier driving, but they are not a substitute for stainless steel in highly corrosive marine environments.\u003c\/p\u003e","brand":"Newport Fasteners","offers":[{"title":"Default Title","offer_id":48206051606747,"sku":"B07D3NMHQF","price":629.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/512ba3zVwYL._SL1000_9574117f-6b1a-4e20-884e-c0d3acb2afd4.jpg?v=1770295516","url":"https:\/\/gearmusthave.com\/products\/1-4-20-x-5-flat-head-floorboard-thread-cutting-screws-durable","provider":"GearMustHave","version":"1.0","type":"link"}