{"product_id":"heli-coil-a3585-04cnpf112-screw-locking-insert-4-40-unc","title":"Heli-coil A3585-04CNPF112 Screw-locking Insert 4-40 Unc","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe HELI-COIL A3585-04CNPF112 is a tangless, screw-locking wire thread insert designed to repair or reinforce threaded holes in softer parent materials. Manufactured from Grade 304 stainless steel with a primer-free finish, it installs into a 4-40 UNC tapped hole and provides a hardened, corrosion-resistant internal thread. The 1D length-to-diameter ratio keeps the insert compact at 0.112 inches overall length, making it well-suited for tight assemblies where axial space is limited. A locking feature built into the coil resists vibration-induced loosening without requiring adhesives or additional hardware. Licensed electricians, aerospace technicians, and precision mechanics are the typical installers.\u003c\/p\u003e\n\u003cp\u003eThis insert is used wherever a 4-40 UNC thread needs to be installed, restored, or strengthened in aluminum, magnesium, plastic, or other materials that cannot sustain full thread loads on their own. The tangless design eliminates the tang-removal step required by traditional insert styles, reducing installation time and removing the risk of a broken tang remaining in the hole. It is commonly found in electronic enclosures, control panels, HVAC equipment housings, and light-duty mechanical assemblies that see vibration or repeated fastener cycling.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eTangless design eliminates tang removal, simplifying installation and reducing debris risk\u003c\/li\u003e\n  \u003cli\u003eGrade 304 stainless steel construction for corrosion resistance and thread durability\u003c\/li\u003e\n  \u003cli\u003eScrew-locking coil geometry resists vibration loosening without adhesives\u003c\/li\u003e\n  \u003cli\u003ePrimer-free finish ready for immediate installation\u003c\/li\u003e\n  \u003cli\u003eMaximum locking torque of 48 oz-in with a minimum breakaway torque of 10 oz-in\u003c\/li\u003e\n  \u003cli\u003eCompact 1D length at 0.112 inches overall suits space-constrained assemblies\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style thread repair and reinforcement insert for 4-40 UNC threaded holes in parent materials requiring thread strength upgrades or stripped-thread restoration.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation requires a properly sized HELI-COIL tap to prepare the parent hole before the insert is driven in with the appropriate tangless installation tool. Power down and de-energize any assembly before performing thread repair work on electrical or control components. Follow the fastener manufacturer's torque specifications for the mating screw after insert installation; do not exceed the insert's rated locking torque. Wear eye protection during installation to guard against metal chips from tapping operations.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 4-40\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: UNC\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength to Diameter Ratio\u003c\/strong\u003e: 1D\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Insert Length\u003c\/strong\u003e: 0.112 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMinimum Outside Diameter\u003c\/strong\u003e: 0.144 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum Outside Diameter\u003c\/strong\u003e: 0.159 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum Locking Torque\u003c\/strong\u003e: 48 oz-in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMinimum Breakaway Torque\u003c\/strong\u003e: 10 oz-in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Free Coils\u003c\/strong\u003e: 2-3\/4\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTang Style\u003c\/strong\u003e: Tangless\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Stainless Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial Grade\u003c\/strong\u003e: 304\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: Primer Free\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Inserts\u003c\/strong\u003e: 1\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: HELI-COIL\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: A3585-04CNPF112\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HELI-COIL","offers":[{"title":"Default Title","offer_id":51962084000050,"sku":"A3585-04CNPF112","price":30.68,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/714b6196867b7a103dba236f20ddcf77.jpg?v=1789947463","url":"https:\/\/voomisupply.com\/products\/heli-coil-a3585-04cnpf112-screw-locking-insert-4-40-unc","provider":"Voomi Supply","version":"1.0","type":"link"}