Heli-coil 17551-04 Thread Insert Tool 4-40 Unc

Product Description

The HELI-COIL 17551-04 is a hand installation tool designed for driving tangless thread inserts into prepared threaded holes. The crank-style handle delivers controlled torque and tactile feedback during installation, reducing the risk of cross-threading or overdriving the insert. This tool is sized specifically for 4-40 UNC thread inserts and is used by machinists, maintenance technicians, and assembly professionals who install thread repair or thread reinforcement inserts in metal, plastic, or composite workpieces. At 0.3 pounds, it is lightweight enough for bench or field use.

This tool is intended for use with tangless thread inserts in 4-40 UNC applications. It is commonly used in precision manufacturing, aerospace assembly, and general maintenance environments where threaded hole integrity is critical. The crank style makes it well suited for production or repetitive installation tasks where a consistent rotational motion is needed without the use of a power driver.

Key Features

• Crank-style handle provides steady, controlled rotational force for accurate insert seating
• Compatible with tangless thread inserts - no tang-break step required after installation
• Sized for 4-40 UNC minimum thread size
• Lightweight at 0.3 pounds for easy single-hand operation
• Hand tool design requires no power source - suitable for field and bench use

Compatibility

Designed for use with tangless thread inserts in 4-40 UNC thread size. Verify insert manufacturer specifications to confirm tool-to-insert fitment before use.

Installation Notes

Ensure the receiving hole is drilled and tapped to the correct specification for the insert size before driving the insert. Power down any equipment and secure the workpiece before beginning thread insert installation. Hand tools like this model should be used at a consistent, moderate pace to avoid misalignment. Follow the insert manufacturer's instructions for proper engagement depth and seating confirmation.