Thread Repair Kits Perma-Coil Inserts

Perma-Coil thread repair kits and inserts restore stripped, worn, or damaged internally threaded holes to full working strength. Often called helical thread inserts, wire thread inserts, or thread repair coils, they are a trusted fix for automotive, motorcycle, marine, RV, and powersports applications, including spark plug ports, engine blocks, cylinder heads, and transmission cases.

Key Features:

• Helical coil design that creates a strong, durable internal thread in the repaired hole
• Restores the original thread size, so the original fastener can be reused
• Spreads fastener load evenly along the thread, which helps resist stripping and wear
• Works in softer base materials such as aluminum and cast iron, where threads strip easily
• Kits are made for hands-on repair and typically include the inserts and the tools needed to install them
• Available in multiple thread sizes and pitches, each sold as its own item in the product line

Perma-Coil inserts let you repair a damaged hole without replacing an expensive component. That saves time and avoids the cost of major part replacement. Choose the child item that matches your thread size and pitch.