Heli-coil 5552-7 Thread Insert Tool 7/16-20 Unf

Product Description

The HELI-COIL 5552-7 is a hand installation tool designed to drive Stud-Lock thread inserts into pre-tapped holes. It accepts the 7/16-20 UNF thread size and provides the mechanical engagement needed to seat inserts accurately without power tools. Technicians use this tool when restoring or reinforcing threaded holes in aluminum, cast iron, or other materials prone to thread failure. The hand-operated design gives the installer direct torque feedback during seating, reducing the risk of overdriving the insert. Suitable for field repairs and bench work alike, this tool is a standard part of any thread repair kit setup for UNF fastener applications.

This tool is used in automotive, HVAC, plumbing, and general mechanical service environments wherever Stud-Lock HELI-COIL inserts in the 7/16-20 UNF size need to be installed. It is well-suited to low-volume installations where a hand tool is preferred over a power driver. Typical install scenarios include stripped fastener holes in equipment housings, flanges, and structural components requiring a permanent, locking thread repair.

Key Features

• Sized specifically for 7/16-20 UNF thread inserts
• Compatible with Stud-Lock HELI-COIL insert style
• Hand operation provides direct torque feedback during installation
• No power tools required - suitable for field and bench use
• Lightweight at 0.45 pounds for easy handling

Compatibility

Designed for use with Stud-Lock thread inserts in the 7/16-20 UNF thread size within the HELI-COIL insert system.

Installation Notes

Installation is performed by a mechanic or service technician after the parent material has been drilled and tapped to the correct HELI-COIL specification. Ensure the tapped hole is clean and free of debris before driving the insert. Apply steady, even hand pressure to seat the insert flush or to the specified depth. Do not use impact drivers or power tools with this hand installation tool.