{"product_id":"heli-coil-535-20-thread-insert-installation-tool-1-1-4-12-unf","title":"Heli-coil 535-20 Thread Insert Installation Tool 1-1\/4-12 Unf","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe HELI-COIL 535-20 is a hand-operated thread insert installation tool designed for use with 1-1\/4-12 UNF thread inserts. It is a Type IV Non-Captive Prewinder, meaning the prewinder sleeve is separate from the mandrel and does not retain the insert after installation. The tool features a spinner diameter of 2 inches and a prewinder length of 3-5\/16 inches. Machinists, maintenance technicians, and field service professionals use this tool to correctly wind and seat helical coil thread inserts into prepared holes, ensuring proper thread engagement and avoiding insert damage during installation.\u003c\/p\u003e\u003cp\u003eThis tool is suited for repair and assembly applications where 1-1\/4-12 UNF thread inserts are being installed by hand. Common use cases include restoring stripped threads in metal components across industrial, mechanical, and equipment maintenance settings. The prewinder design helps compress and align the insert before it enters the tapped hole, reducing installation errors and controlling insert placement depth.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eType IV Non-Captive Prewinder design for 1-1\/4-12 UNF thread inserts\u003c\/li\u003e\n\u003cli\u003eSpinner diameter of 2 inches for controlled hand torque during installation\u003c\/li\u003e\n\u003cli\u003ePrewinder length of 3-5\/16 inches for proper insert alignment and compression\u003c\/li\u003e\n\u003cli\u003eHand installation method  -  no power tools required\u003c\/li\u003e\n\u003cli\u003eCompatible with UNF thread standard inserts at the 1-1\/4-12 pitch\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for use with 1-1\/4-12 UNF helical thread inserts requiring hand installation with a Type IV Non-Captive Prewinder tool.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eThis tool is installed by hand and requires no power equipment. Before installing a thread insert, ensure the tapped hole meets the required dimensions for the insert being used and that the hole is clean and free of debris. Follow the thread insert manufacturer's torque guidance for the specific insert being seated. Do not use impact or power drivers with this hand installation tool.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHand Installation Tool Type\u003c\/strong\u003e: Prewinder, Type IV Non-Captive Prewinder\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMinimum Thread Size\u003c\/strong\u003e: 1-1\/4-12\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: UNF\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpinner Diameter\u003c\/strong\u003e: 2 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrewinder Length\u003c\/strong\u003e: 3-5\/16 inches\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: 535-20\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HELI-COIL","offers":[{"title":"Default Title","offer_id":51988815806770,"sku":"535-20","price":473.56,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/6ba13af8b4d9773e241d78b3251c782b.jpg?v=1789987874","url":"https:\/\/voomisupply.com\/products\/heli-coil-535-20-thread-insert-installation-tool-1-1-4-12-unf","provider":"Voomi Supply","version":"1.0","type":"link"}