Heli-coil 17551-4 Thread Insert Tool 1/4-20 Crank Style

Product Description

The HELI-COIL 17551-4 is a crank-style hand installation tool designed for driving tangless thread inserts into pre-tapped holes. It works with 1/4-20 UNC thread inserts and provides the mechanical advantage needed to seat inserts accurately without power tools. The crank-style handle allows controlled, single-hand rotation, making it well-suited for field repairs, production line rework, and maintenance applications where insert installation speed and placement accuracy both matter. At 0.3 pounds, the tool is light enough for extended use without fatigue.

This tool is used in applications where threaded hole repair or thread reinforcement is required. Common scenarios include restoring stripped threads in aluminum castings, plastic housings, and thin-walled metal components. It is appropriate for use in HVAC equipment assembly, mechanical rework, and general manufacturing environments. Installation technicians working with tangless insert systems will recognize this as the correct driver for 1/4-20 UNC insert sizes.

Key Features

• Crank-style handle delivers controlled torque for accurate tangless insert installation
• Sized specifically for 1/4-20 UNC thread inserts
• Compatible with tangless insert design, eliminating the need for tang break-off after installation
• Lightweight at 0.3 pounds for comfortable extended use
• Hand-operated design requires no power source, suitable for field and bench use

Compatibility

Designed for use with tangless thread inserts in 1/4-20 UNC thread size. Compatible with tangless insert systems requiring a hand-driven crank-style installation tool for that thread specification.

Installation Notes

Installation of thread inserts is typically performed by maintenance technicians or assemblers following thread repair procedures. The parent material must be drilled and tapped to the correct insert tap size before driving the insert. Verify that the insert is properly aligned with the tapped hole before applying rotational force to avoid cross-threading. Do not use impact drivers or power tools with this hand installation tool.