{"product_id":"heli-coil-3724-14-thread-insert-tool-7-8-9-unc","title":"Heli-coil 3724-14 Thread Insert Tool 7\/8-9 Unc","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe HELI-COIL 3724-14 is a hand installation tool designed for driving threaded wire inserts into tapped holes. It uses a Type III threaded mandrel to engage the insert tang and drive the coil flush or below the surface of the host material. Compatible with both free-running and locking insert styles, this tool is suited for 7\/8-9 UNC thread sizes. At 4-7\/8 inches in overall length and a 4-1\/2 inch spinner diameter, it gives the installer enough mechanical advantage for controlled, repeatable insertion by hand without power tools.\u003c\/p\u003e\n\u003cp\u003eThis tool is used wherever HELI-COIL or equivalent wire thread inserts are installed in stripped, damaged, or understrength threaded bores. Typical applications include engine block repairs, heavy equipment component threads, structural fastener locations, and industrial maintenance work. It is used by machinists, maintenance mechanics, and field service technicians across aerospace, automotive, and general industrial trades. The 7\/8-9 UNC designation makes it appropriate for coarse-thread applications in ferrous and non-ferrous base materials.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eType III threaded mandrel drives 7\/8-9 UNC free-running and locking inserts\u003c\/li\u003e\n  \u003cli\u003e4-7\/8 inch overall length provides hand-torque leverage for controlled installation\u003c\/li\u003e\n  \u003cli\u003e4-1\/2 inch spinner diameter supports smooth, stable one-hand operation\u003c\/li\u003e\n  \u003cli\u003eCompatible with both free-running and locking insert styles in the 7\/8-9 size range\u003c\/li\u003e\n  \u003cli\u003eUNC thread standard matches standard coarse-pitch inch-series inserts\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use with HELI-COIL free-running and locking thread inserts in the 7\/8-9 UNC size. Verify insert series and coil diameter before use to confirm correct mandrel fitment.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by hand without power tools. The tapped hole must be prepared to the correct HELI-COIL tap size for 7\/8-9 UNC before the insert is driven. Engage the mandrel onto the insert tang, align the insert with the hole, and turn the spinner clockwise until the insert seats at the specified depth. After seating, break off the drive tang with a punch if required by 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: 7\/8-9\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: UNC\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMandrel Type\u003c\/strong\u003e: Type III Threaded Mandrel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsert Compatibility\u003c\/strong\u003e: Free-Running and Locking\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 4-7\/8 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSpinner Diameter\u003c\/strong\u003e: 4-1\/2 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.55 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: 3724-14\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HELI-COIL","offers":[{"title":"Default Title","offer_id":52043525980466,"sku":"3724-14","price":142.52,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/65ae2157ee15cf30d2305927620999f8.jpg?v=1790029137","url":"https:\/\/voomisupply.com\/products\/heli-coil-3724-14-thread-insert-tool-7-8-9-unc","provider":"Voomi Supply","version":"1.0","type":"link"}