{"product_id":"heli-coil-a3585-4cn375-screw-locking-insert-1-4-20-unc","title":"Heli-coil A3585-4CN375 Screw-locking Insert 1\/4-20 Unc","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe HELI-COIL A3585-4CN375 is a tangless screw-locking helical coil insert designed to create or restore durable, vibration-resistant threaded holes in a wide range of base materials. Built from Grade 304 stainless steel with a bright finish, it accepts a 1\/4-20 UNC screw thread and measures 0.375 inches in overall length, corresponding to a 1-1\/2D length-to-diameter ratio. The locking feature is achieved through a deformed coil section that applies controlled radial pressure against the mating fastener, with a maximum locking torque of 30 in\/lb and a minimum breakaway torque of 4.50 in\/lb. The tangless design eliminates the need to remove a tang after installation, reducing assembly steps and debris risk in blind-hole applications. Machinists, maintenance technicians, and assembly professionals install these inserts.\u003c\/p\u003e\n\u003cp\u003eThis insert is suited for applications where thread strength, corrosion resistance, and vibration resistance are required in aluminum, magnesium, cast iron, plastics, and other materials with lower base-thread strength than the fastener. The 1\/4-20 UNC thread form is common across general industrial, aerospace, and mechanical assembly work. The 5-3\/4 free coil count and 0.375-inch length make it appropriate for standard fastener engagement depths in thinner or space-constrained workpieces. It is sold individually, with a minimum order quantity of 10 units.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eTangless design eliminates post-installation tang removal, reducing assembly time and contamination risk in blind holes\u003c\/li\u003e\n  \u003cli\u003eGrade 304 stainless steel construction provides corrosion resistance and long service life\u003c\/li\u003e\n  \u003cli\u003e1\/4-20 UNC thread form with 0.375 inches overall length at a 1-1\/2D length-to-diameter ratio\u003c\/li\u003e\n  \u003cli\u003eMaximum locking torque of 30 in\/lb with a minimum breakaway torque of 4.50 in\/lb for reliable vibration resistance\u003c\/li\u003e\n  \u003cli\u003eOutside diameter range of 0.310 to 0.330 inches for consistent fit in standard Heli-Coil tapped holes\u003c\/li\u003e\n  \u003cli\u003eBright finish with 5-3\/4 free coils for uniform thread engagement\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement or new-installation insert for standard 1\/4-20 UNC Heli-Coil tapped holes in base materials requiring thread repair or thread reinforcement.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation requires a properly sized Heli-Coil tap to prepare the receiving hole to the correct diameter and thread form before the insert is driven in. A Heli-Coil installation tool compatible with the tangless insert style should be used to drive the coil to the correct depth without damaging the coil geometry. Power down or de-energize any assembly before thread repair work begins on live components. Follow the tool manufacturer torque guidelines and inspect the installed insert for full seating before assembling the mating fastener.\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\u003eOverall Insert Length\u003c\/strong\u003e: 0.375 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength to Diameter Ratio\u003c\/strong\u003e: 1-1\/2D\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Free Coils\u003c\/strong\u003e: 5-3\/4\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\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\u003eWeight\u003c\/strong\u003e: 0.003 pounds\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: A3585-4CN375\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HELI-COIL","offers":[{"title":"Default Title","offer_id":51995454210354,"sku":"A3585-4CN375","price":25.2,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/e6289d9bae696e9f6894d5f348634e4b.jpg?v=1789992687","url":"https:\/\/voomisupply.com\/products\/heli-coil-a3585-4cn375-screw-locking-insert-1-4-20-unc","provider":"Voomi Supply","version":"1.0","type":"link"}