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 AccountHeli-Coil R1185-6 general-purpose, flat-bottomed loose inserts are designed for blind holes and provide reliable thread repair in a wide range of materials. Made from medium-strength steel with a Black Oxide coating, these 3/8"-16 inserts are compatible with taps, reamers, and die sets for precise, durable thread restoration.
Installation requires a tool designed for the specific application; the main tap hole should NOT be reamed prior to installation. A free-running insert design helps prevent seizing, making these inserts suitable for demanding industrial, MRO, and aerospace-style applications including aircraft nut series 14-10.