Heli-coil 2299-4 Thread Insert Tool 1/4-28 Unf

Product Description

The HELI-COIL 2299-4 is a hand installation tool designed specifically for inserting HELI-COIL thread inserts into pre-tapped holes. It drives wire thread inserts to the correct depth without power tools, giving the installer precise control during the installation process. This tool is sized for 1/4-28 UNF threads and is the correct driver to use when installing inserts in that thread size. Maintenance technicians, machinists, and field service professionals use this tool when repairing stripped or damaged threads in metal components across HVAC equipment, pumps, compressors, and other mechanical assemblies.

This tool is suited for repair work on aluminum, cast iron, and steel housings where a stripped threaded hole needs to be restored to full load-bearing strength. It is commonly used in light commercial and residential service environments wherever a 1/4-28 UNF thread insert is being installed by hand. The tool is designed for low-volume, controlled installations where a manual driver is preferred over a power installation tool.

Key Features

• Sized for 1/4-28 UNF thread inserts - no adapters required
• Hand-operated design provides tactile feedback and reduces risk of over-driving the insert
• Compatible with the standard HELI-COIL insert installation process for UNF thread sizes
• Compact tool suitable for field service and bench repair applications

Compatibility

Designed for use with HELI-COIL wire thread inserts in the 1/4-28 UNF thread size. Intended for hand installation applications where this specific thread size and UNF thread standard apply.

Installation Notes

Before installing a thread insert, ensure the hole has been drilled and tapped to the correct HELI-COIL specification for the 1/4-28 UNF size. Power down or de-energize any equipment before performing thread repair work on components in service. Engage the insert onto the tool tang and drive it into the tapped hole by hand until the top of the insert sits flush or one turn below the surface. After installation, break off the drive tang using a tang break-off tool if required by the insert type.