Heli-Coil R51320 Spark Plug Thread Repair Inserts 14mm x 1.25 6-Pack

Heli-Coil R51320 replacement thread inserts are designed specifically for spark plug thread repair in 14mm x 1.25 pitch applications. These precision-engineered inserts restore damaged threads to original equipment specifications, providing a permanent repair solution for stripped or damaged spark plug holes.

Key Features:

• 14mm diameter with 1.25mm thread pitch for standard spark plug applications
• 0.472 inch (12mm) reach length for proper spark plug seating
• Manufactured from high-quality stainless steel wire for superior strength and corrosion resistance
• Creates stronger threads than the original parent material
• Easy installation with proper Heli-Coil installation tools
• Package includes 6 thread inserts for multiple repairs

Heli-Coil inserts are the industry standard for professional thread repair in automotive, marine, and small engine applications. Once installed, these inserts provide a permanent threaded hole that can withstand repeated spark plug changes without thread degradation. The insert's coiled wire design distributes stress evenly across all thread engagement points, eliminating the common problem of stripped aluminum cylinder head threads.