{"product_id":"heli-coil-a3585-4cn625-screw-locking-insert-1-4-20-unc","title":"Heli-coil A3585-4CN625 Screw-locking Insert 1\/4-20 Unc","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe HELI-COIL A3585-4CN625 is a tangless, screw-locking wire thread insert designed to restore or reinforce internal threads in metal assemblies. Made from Grade 304 stainless steel with a bright finish, it installs into a pre-tapped host bore and provides a hardened, corrosion-resistant thread form that resists fastener back-out under vibration. The insert carries a 1\/4-20 UNC thread size, measures 0.625 inches in overall length at a 2-1\/2D length-to-diameter ratio, and delivers a maximum locking torque of 30 in\/lb with a minimum breakaway torque of 4.50 in\/lb. Typically installed by maintenance technicians, machinists, and assembly mechanics in production and repair environments.\u003c\/p\u003e\n\u003cp\u003eThis insert is suited for applications where thread stripping, cross-threading, or material fatigue has compromised the host bore, or where original design calls for a hardened thread insert in aluminum, cast iron, or soft metal parent materials. The tangless design eliminates the need to remove a drive tang after installation, reducing installation steps and the risk of tang fragments in enclosed assemblies. Common in aerospace, automotive, industrial equipment, and general mechanical repair scenarios where 1\/4-20 UNC fasteners are used under vibration or repeated removal cycles.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eTangless design eliminates post-installation tang removal and prevents loose fragments in blind holes\u003c\/li\u003e\n  \u003cli\u003eGrade 304 stainless steel construction for corrosion resistance in demanding service environments\u003c\/li\u003e\n  \u003cli\u003e1\/4-20 UNC thread form matches standard inch fasteners\u003c\/li\u003e\n  \u003cli\u003e2-1\/2D length-to-diameter ratio at 0.625 inches OAL for a deeper thread engagement zone\u003c\/li\u003e\n  \u003cli\u003eMaximum locking torque of 30 in\/lb resists fastener loosening under vibration\u003c\/li\u003e\n  \u003cli\u003eMinimum breakaway torque of 4.50 in\/lb maintains removability without thread damage\u003c\/li\u003e\n  \u003cli\u003eBright finish with 10-3\/8 free coils for consistent coil tension and seating\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 host materials tapped to accept 1\/4-20 UNC Heli-Coil inserts at a 2-1\/2D installation depth.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation requires a properly sized Heli-Coil tap to prepare the host bore before the insert is driven. Power down or de-energize any assembly before thread repair work begins. Use the appropriate tangless installation tool specified for this insert series to avoid coil distortion. Verify host material and bore depth are within specification before installation to ensure full thread engagement.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 1\/4-20 UNC\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: UNC\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Insert Length\u003c\/strong\u003e: 0.625 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength to Diameter Ratio\u003c\/strong\u003e: 2-1\/2D\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMinimum Outside Diameter\u003c\/strong\u003e: 0.310 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum Outside Diameter\u003c\/strong\u003e: 0.330 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum Locking Torque\u003c\/strong\u003e: 30 in\/lb\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMinimum Breakaway Torque\u003c\/strong\u003e: 4.50 in\/lb\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Free Coils\u003c\/strong\u003e: 10-3\/8\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: Bright\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTang\u003c\/strong\u003e: Tangless\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: A3585-4CN625\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HELI-COIL","offers":[{"title":"Default Title","offer_id":52079965208882,"sku":"A3585-4CN625","price":26.16,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/e217ab72b771090e365792314d3eaa8e.jpg?v=1790055221","url":"https:\/\/voomisupply.com\/products\/heli-coil-a3585-4cn625-screw-locking-insert-1-4-20-unc","provider":"Voomi Supply","version":"1.0","type":"link"}