Heli-coil 535-20 Thread Insert Installation Tool 1-1/4-12 Unf

Product Description

The 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.

This 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.

Key Features

• Type IV Non-Captive Prewinder design for 1-1/4-12 UNF thread inserts
• Spinner diameter of 2 inches for controlled hand torque during installation
• Prewinder length of 3-5/16 inches for proper insert alignment and compression
• Hand installation method - no power tools required
• Compatible with UNF thread standard inserts at the 1-1/4-12 pitch

Compatibility

Designed for use with 1-1/4-12 UNF helical thread inserts requiring hand installation with a Type IV Non-Captive Prewinder tool.

Installation Notes

This 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.