Heli-Coil 819-4 Thread Repair Kit with Tap and Plug 1/4-20 NC

The Heli-Coil 819-4 is a comprehensive thread repair kit designed for 1/4-20 NC (National Coarse) threads. This professional-grade kit provides everything needed to restore damaged or stripped threads in aluminum, magnesium, cast iron, and other soft metals.

Key Features:

• Includes STI (Screw Thread Insert) tap specifically sized for 1/4-20 thread repair
• Tang break-off tool for clean installation finishing
• Installation tool for proper insert placement
• Creates stronger threads than the original material
• Allows use of standard 1/4-20 bolts after repair

Heli-Coil thread inserts form precision internal screw threads that provide permanent wear-free bearing surfaces. The repair process involves drilling out the damaged threads, tapping with the included STI tap, and installing a helical coil insert that becomes a permanent part of the parent material. Ideal for automotive, machinery, and equipment repair applications.