{"product_id":"heli-coil-535-12-thread-insert-tool-3-4-16-unf-prewinder","title":"Heli-coil 535-12 Thread Insert Tool 3\/4-16 Unf Prewinder","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe HELI-COIL 535-12 is a hand installation tool designed for driving threaded wire inserts into prepared parent material. It uses a Type IV Non-Captive Prewinder mechanism that prewinds the insert before driving it to full depth, eliminating the need for a separate mandrel in many applications. The tool handles the 3\/4-16 UNF thread size and accommodates both free-running and locking insert types. With a spinner diameter of 1.5 inches and a prewinder length of 2.875 inches, it is sized for bench-top or in-field use by technicians performing thread repair or thread reinforcement work.\u003c\/p\u003e\u003cp\u003eThis tool is suited for use in automotive, industrial maintenance, and mechanical repair environments where 3\/4-16 UNF threaded inserts must be installed consistently and to proper depth. It is commonly used on engine components, equipment housings, and structural assemblies where stripped or damaged threads are being restored. The hand-operated design makes it practical for situations where access or torque control rules out power tools. Mechanics, machinists, and maintenance technicians are the primary users.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eType IV Non-Captive Prewinder design prewinds insert before installation\u003c\/li\u003e\n\u003cli\u003eCompatible with both free-running and locking UNF thread inserts\u003c\/li\u003e\n\u003cli\u003eFits 3\/4-16 UNF thread size\u003c\/li\u003e\n\u003cli\u003eSpinner diameter of 1.5 inches for positive grip and control\u003c\/li\u003e\n\u003cli\u003ePrewinder length of 2.875 inches provides reach for recessed bores\u003c\/li\u003e\n\u003cli\u003eHand-operated for controlled installation without power tools\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for use with free-running and locking wire thread inserts in the 3\/4-16 UNF thread standard. Specific insert product compatibility should be confirmed against HELI-COIL insert series documentation prior to use.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a qualified mechanic or machinist familiar with thread insert procedures. The parent material must be drilled and tapped to the correct insert tap size before using this tool. Ensure the workpiece is secured and, where applicable, depowered or depressurized before beginning thread repair. Do not exceed the manual torque appropriate for the insert material and parent material combination.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 3\/4-16\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: UNF\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTool Type\u003c\/strong\u003e: Hand Installation Tool, Prewinder Type IV Non-Captive\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\u003eSpinner Diameter\u003c\/strong\u003e: 1.5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrewinder Length\u003c\/strong\u003e: 2.875 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 23291800\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\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: 535-12\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HELI-COIL","offers":[{"title":"Default Title","offer_id":52083662225714,"sku":"535-12","price":290.03,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/525bb0379553420b3b9711407cdea7de.jpg?v=1790057640","url":"https:\/\/voomisupply.com\/products\/heli-coil-535-12-thread-insert-tool-3-4-16-unf-prewinder","provider":"Voomi Supply","version":"1.0","type":"link"}