Heli-coil 5552-4 Thread Insert Tool 1/4-28 Unf

Product Description

The HELI-COIL 5552-4 is a hand installation tool designed to drive threaded wire inserts into prepared holes. It accepts 1/4-28 UNF inserts and is specifically matched to Stud-Lock insert types. The tool engages the drive tang of the insert and winds it into a tapped hole, forming a permanent, wear-resistant threaded repair or reinforcement. It is used in manual installation workflows where torque control is handled by the technician rather than a powered drive tool. Mechanics, millwrights, and field service technicians working across aerospace, automotive, and general mechanical repair rely on this tool when powered options are not practical or available.

This tool is suited for repair and production applications requiring precise thread restoration or thread reinforcement in metal, composite, or cast components. The 1/4-28 UNF designation matches fine-thread fastener applications common in precision assemblies, automotive systems, and light structural work. It is appropriate for both bench work and field installation wherever Stud-Lock inserts of the 1/4-28 size are specified.

Key Features

• Matched to 1/4-28 UNF thread size for direct insert compatibility
• Compatible with Stud-Lock insert type for permanent locking installations
• Hand-operated design allows use without power tools or specialized equipment
• Compact and lightweight at 0.25 pounds for easy field carry
• Designed for use within the HELI-COIL system for consistent, repeatable results

Compatibility

Designed for use with HELI-COIL Stud-Lock threaded wire inserts in the 1/4-28 UNF thread size. Intended for use as part of the HELI-COIL hand installation system for that insert type and thread standard.

Installation Notes

Installation is performed by a mechanic or technician after the host material has been drilled and tapped to the correct HELI-COIL tap size for 1/4-28 UNF. Ensure the tapped hole is clean and free of debris before driving the insert. No power source is required, but proper hole preparation with the correct tap is essential for thread engagement. Follow applicable industry or OEM specifications for insert depth and Stud-Lock staking requirements.