Helicoil
HELI COIL/STANLEY ENGINEERED FASTENING HE5521-5 THREAD REPAIR KIT 5/16-18UNC
THREAD REPAIR KIT 5/16-18UNC
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Create A New AccountThe Heli-Coil HELR513-20 Spark Plug Insert is designed to repair and restore damaged spark plug threads in cylinder heads, providing a reliable, long-lasting fix. Each precision-engineered insert installs into a drilled and tapped hole to deliver factory-strength threads that withstand the heat and torque demands of engine environments.
Packaged in a convenient 6-piece set, these 14mm x 1.25mm pitch inserts are ideal for automotive technicians, engine rebuilders, and MRO professionals who need a dependable thread repair solution for spark plug applications.