{"product_id":"heli-coil-a1185-4cn625-1-4-20-free-running-insert-0-625-in","title":"Heli-coil A1185-4CN625 1\/4-20 Free Running Insert 0.625 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe HELI-COIL A1185-4CN625 is a free running helical wire thread insert designed to restore or reinforce internal threads in a wide range of base materials. Configured for 1\/4-20 UNC thread, this insert measures 0.625 inches overall length, corresponding to a 2-1\/2D length-to-diameter ratio. Manufactured from 304 stainless steel with a bright, uncoated finish, it delivers strong corrosion resistance and dimensional consistency. The tanged design allows installation using a standard drive tool, making it suitable for production and repair environments. Machinists, maintenance technicians, and assembly professionals install these inserts in metal, plastic, and composite components where thread integrity is critical.\u003c\/p\u003e\n\u003cp\u003eThis insert is used wherever a 1\/4-20 UNC internal thread needs to be established or repaired. Common applications include stripped fastener holes in aluminum housings, cast iron assemblies, and thin-wall metal components across industrial, automotive, aerospace, and general manufacturing settings. The 0.625-inch overall length suits deeper hole applications that require additional thread engagement beyond standard-length inserts. The free running design allows normal fastener torque without locking drag, making it appropriate for assemblies that require frequent removal and reinstallation of the mating fastener.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e1\/4-20 UNC thread size for compatibility with standard fractional inch fasteners\u003c\/li\u003e\n  \u003cli\u003e0.625 inch overall length with 2-1\/2D length-to-diameter ratio for enhanced thread engagement\u003c\/li\u003e\n  \u003cli\u003e304 stainless steel construction provides corrosion resistance in demanding environments\u003c\/li\u003e\n  \u003cli\u003eTanged design for use with standard HELI-COIL drive installation tools\u003c\/li\u003e\n  \u003cli\u003eBright, uncoated finish maintains dimensional accuracy without added coating thickness\u003c\/li\u003e\n  \u003cli\u003e10-3\/8 free coils provide consistent load distribution across the insert length\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style thread repair and insert solution for 1\/4-20 UNC threaded holes in metal, plastic, and composite base materials requiring a free running helical wire insert installation.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation requires a matching HELI-COIL tap to prepare the receiving hole to the correct oversize thread form before the insert is driven in. A dedicated drive tool sized for the 1\/4-20 insert is required to wind the insert into the prepared hole without distorting the coils. After installation, break off the tang using a tang break-off tool or a punch at the notch provided, then verify thread engagement with the mating fastener before returning the assembly to service.\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 in\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 (5\/8 in)\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\u003eTang\u003c\/strong\u003e: Tanged\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\/Uncoated\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Inserts\u003c\/strong\u003e: 1\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.006 pounds\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: A1185-4CN625\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HELI-COIL","offers":[{"title":"Default Title","offer_id":52103726072114,"sku":"A1185-4CN625","price":24.37,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/8605da7dd51a87070d9c2506b2c392dd.jpg?v=1790071505","url":"https:\/\/voomisupply.com\/products\/heli-coil-a1185-4cn625-1-4-20-free-running-insert-0-625-in","provider":"Voomi Supply","version":"1.0","type":"link"}