{"product_id":"heli-coil-a3585-04en112-screw-locking-insert-4-40-unc","title":"Heli-coil A3585-04EN112 Screw-locking Insert 4-40 Unc","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe HELI-COIL A3585-04EN112 is a tangless screw-locking helical coil insert designed to create strong, vibration-resistant threaded holes in parent materials. Built from Grade 18-8 stainless steel, this insert accepts a 4-40 UNC screw thread and measures 0.112 inches in overall length, corresponding to a 1D length-to-diameter ratio. The tangless design eliminates the need for tang break-off after installation, reducing debris risk and simplifying installation in blind holes. Licensed mechanics, maintenance technicians, and assembly professionals use these inserts to repair stripped threads or build up thread strength in thin or soft base materials.\u003c\/p\u003e\n\u003cp\u003eThis insert is suited for light-duty fastening applications in precision assemblies, electronic enclosures, sheet metal components, and other structures requiring a reliable 4-40 UNC thread form. The 18-8 stainless steel construction resists corrosion, making it appropriate for environments with moisture exposure or mild chemical contact. With an outside diameter ranging from 0.144 to 0.159 inches, the insert installs into a properly prepared helical insert tap drill hole using a standard HELI-COIL installation tool sized for 4-40 thread.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eTangless design eliminates post-installation tang removal and reduces debris in blind holes\u003c\/li\u003e\n  \u003cli\u003eGrade 18-8 stainless steel construction for corrosion resistance and durability\u003c\/li\u003e\n  \u003cli\u003e4-40 UNC thread size with 1D length-to-diameter ratio at 0.112 inches overall length\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\u003eOutside diameter range of 0.144 to 0.159 inches for secure parent-material engagement\u003c\/li\u003e\n  \u003cli\u003e2-3\/4 free coils provide consistent thread locking performance across the insert length\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement or new-installation thread insert for applications requiring a 4-40 UNC screw-locking helical coil insert with a 1D length ratio.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation requires a drill, a HELI-COIL tap sized for 4-40 UNC, and a compatible tangless installation tool. Power down or de-energize any assembly before drilling and tapping operations. Ensure the tap drill hole depth meets the insert length requirement before driving the insert. Do not over-drive the insert past the flush or slightly sub-flush seating depth specified for the application.\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 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: 0.112 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength to Diameter Ratio\u003c\/strong\u003e: 1D\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\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: 18-8\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: A3585-04EN112\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HELI-COIL","offers":[{"title":"Default Title","offer_id":51973936972082,"sku":"A3585-04EN112","price":21.11,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/3ba4874ed5cafc966bd7ab862caf1f81.jpg?v=1789975112","url":"https:\/\/voomisupply.com\/products\/heli-coil-a3585-04en112-screw-locking-insert-4-40-unc","provider":"Voomi Supply","version":"1.0","type":"link"}