Heli-Coil Thread Repair Inserts NC

Heli-Coil Thread Repair Inserts NC (National Coarse) restore damaged, stripped or worn internal threads. They also create strong, durable threads in softer base materials. Each insert is a precision-formed helical coil of diamond-shaped wire. It is installed in a tapped hole to make a new internal thread that accepts the original fastener size. These screw thread inserts are also called helical thread inserts, thread repair coils or stripped thread repair inserts.

Key Features:

• Restores original thread size: The repaired hole takes the standard NC (Unified National Coarse) fastener again.
• Precision wire construction: The diamond-shaped wire profile gives a smooth, accurate thread form and spreads load evenly along the thread.
• Strong, wear-resistant threads: The finished thread is often stronger and more wear-resistant than the original, especially in aluminum, magnesium, cast iron and other soft materials.
• Corrosion-resistant material: Stainless steel wire handles heat, vibration and exposure to many fluids.
• Trusted brand: Heli-Coil is a long-established name in thread repair and is widely used in automotive, powersports, marine, RV and industrial work.

Typical Applications: Common uses are repairing stripped spark plug holes, oil pan and drain plug threads, engine block and cylinder head holes, transmission case threads and other tapped holes in aluminum or cast components. The inserts also work for reinforcing threads in new designs.

For best results, install with the matching Heli-Coil tap and installation tools. This gives a clean, accurate repair without replacing the damaged part.