{"product_id":"duro-dyne-15156-self-piercing-self-threading-hex-head-screw-8-x-3-4-inches","title":"Duro Dyne 15156 Self Piercing Self Threading Hex Head Screw 8 X 3\/4 Inches","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe Duro Dyne 15156 is a self piercing and self threading hex head screw designed for HVAC sheet metal and ductwork fabrication. Built for trade professionals who need a fast, reliable fastener without the extra step of pre-drilling, this screw creates its own hole as it drives. The sharp cone point acts like a scratch awl, piercing light gauge steel and forming a threaded cone hole as the screw advances. This eliminates the need for a separate drill bit or punch, saving time on the job. HVAC technicians and sheet metal workers rely on screws like this for ductwork assembly, flanged connections, and general sheet metal joining tasks. The 15156 features a size 8 shank measuring 3\/4 inches in length and is driven with a 1\/4 inch external hex head, making it compatible with standard hex drivers and nut setters used every day in the field. The head is hexagonal slotted, giving you the option to drive with a hex bit or a flat blade screwdriver in tight spots. Cold heading quality steel provides strong, consistent hardness throughout. The case hardened construction reaches a minimum Rockwell C55 rating, meaning the tip stays sharp and the threads hold their form even when piercing steel. A zinc plated finish delivers corrosion resistance for installations in areas exposed to moisture, condensation, or variable temperatures. The twin lead point design features two continuous threads that speed up engagement and reduce the effort needed to drive the screw into sheet metal. The 15156 meets or exceeds JIS 1125 specifications for cone point screws, giving contractors confidence in a fastener built to a recognized industry standard. This screw is rated for maximum drilling thickness of 0.04 inches, making it well suited for light gauge steel ductwork and HVAC panel applications.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eSelf piercing tip eliminates pre-drilling on light gauge steel ductwork\u003c\/li\u003e\n\u003cli\u003eTwin lead double thread point for fast engagement and reduced drive effort\u003c\/li\u003e\n\u003cli\u003eCase hardened to Rockwell C55 minimum for long lasting sharpness and thread integrity\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eProduct Highlights\u003c\/h4\u003e\u003cp\u003eThe Duro Dyne 15156 self piercing screw is a purpose-built HVAC fastener that speeds up sheet metal assembly by combining piercing and threading in a single step. Its zinc plated, case hardened construction meets JIS 1125 standards and holds up in demanding ductwork environments.\u003c\/p\u003e\u003ch3\u003eProduct Information\u003c\/h3\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: DURO DYNE\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 15156\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eScrew Size\u003c\/strong\u003e: 8\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength\u003c\/strong\u003e: 3\/4 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrive Type\u003c\/strong\u003e: External Hex\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrive Size\u003c\/strong\u003e: 1\/4 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHead Type\u003c\/strong\u003e: Hexagonal Slotted\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTip Type\u003c\/strong\u003e: Self Piercing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Cold Heading Quality Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish\u003c\/strong\u003e: Zinc Plated\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHead Color\u003c\/strong\u003e: Silver\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardness\u003c\/strong\u003e: Rockwell C55 Minimum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMax Drilling Thickness\u003c\/strong\u003e: 0.04 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Design\u003c\/strong\u003e: Twin Lead Double Continuous Thread\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConformance\u003c\/strong\u003e: Meets or Exceeds JIS 1125 Cone Point Screw Specifications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem of Measurement\u003c\/strong\u003e: Inch\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"DURO DYNE","offers":[{"title":"Default Title","offer_id":51121009164594,"sku":"15156","price":323.75,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/304878452.jpg?v=1777745764","url":"https:\/\/voomisupply.com\/products\/duro-dyne-15156-self-piercing-self-threading-hex-head-screw-8-x-3-4-inches","provider":"Voomi Supply","version":"1.0","type":"link"}