Heli-coil 17552-4 Thread Insert Tool 1/4-28 Unf Crank

Product Description

The HELI-COIL 17552-4 is a hand installation tool designed for driving tangless thread inserts into prepared holes. Built in a crank style configuration, it allows technicians to seat inserts by hand with controlled torque and consistent depth. The tool is sized specifically for 1/4-28 UNF thread inserts, making it a dedicated instrument rather than a universal adapter. It is a standard component in thread repair and thread reinforcement work across mechanical, HVAC, and industrial maintenance applications. Weighing 0.46 pounds, it is lightweight enough for extended handheld use in tight service environments.

This tool is used wherever tangless helical thread inserts must be installed into a 1/4-28 UNF tapped hole. Common applications include thread repair on aluminum housings, brackets, and structural components found in HVAC equipment, refrigeration units, pumps, and general mechanical assemblies. It is suited for shop bench work as well as field service calls where power tools are impractical or where insert damage risk must be minimized. Machinists, maintenance technicians, and service professionals across the trades use this style of hand tool as part of a complete thread insert kit workflow.

Key Features

• Crank style handle provides controlled, consistent torque during insert installation
• Compatible exclusively with tangless thread inserts in 1/4-28 UNF sizing
• Lightweight at 0.46 pounds for extended handheld use
• UNF thread standard ensures compatibility with fine-thread fastener applications
• Hand-operated design eliminates risk of overshooting insert depth with power tools

Compatibility

Designed for use with tangless helical thread inserts in 1/4-28 UNF thread size. This tool is not compatible with tanged insert styles or metric thread inserts.

Installation Notes

Installation of thread inserts is typically performed by machinists, maintenance technicians, or licensed trade professionals as part of thread repair procedures. Before installing any insert, ensure the host material has been drilled and tapped to the correct insert-size specification for 1/4-28 UNF threads. Use the crank handle with steady, even pressure to drive the insert flush or just below the surface of the parent material. Do not use impact drivers or power tools with this hand installation tool.