Heli-coil 3747-18 Thread Insert Tool M18 X 2.50

Product Description

The HELI-COIL 3747-18 is a hand installation tool designed to drive M18 x 2.50 metric coarse thread inserts into pre-tapped holes. The tool engages the tang of the wire thread insert and winds it into the threaded hole with controlled torque, seating the insert flush or below the surface as required. It is a manual, non-powered tool suited for bench work and field repair where power tools are not practical. Machinists, maintenance technicians, and field service professionals use this tool when restoring or reinforcing threaded holes in metal, composite, or cast components.

This tool is used in applications where M18 x 2.50 metric coarse HELI-COIL inserts are being installed. Typical scenarios include thread repair on engine components, heavy equipment, industrial machinery, and structural assemblies where a stripped or damaged M18 thread must be restored to full load-bearing capacity. The hand installation method is preferred in tight-clearance situations or when precise feel during installation is critical to avoid overdriving the insert.

Key Features

• Sized specifically for M18 x 2.50 metric coarse thread inserts
• Manual hand tool design allows controlled, tactile installation without power equipment
• Compatible with the standard HELI-COIL tang-drive insert installation method
• Compact tool format suits both shop bench use and field repair work

Compatibility

Designed for use with M18 x 2.50 metric coarse thread HELI-COIL wire thread inserts installed in the corresponding HELI-COIL tapped hole size.

Installation Notes

A licensed machinist or qualified maintenance technician should confirm the hole has been drilled and tapped to the correct HELI-COIL specification before using this tool. Ensure the workpiece is secure and the hole is clean and free of debris prior to installation. Do not apply excessive force when driving the insert - resistance typically indicates misalignment or an improperly tapped hole. After installation, use the appropriate tang break-off tool to remove the drive tang if required by the application.