The ATC 10120 3/4″-16 Bottom Headbolt Thread Chasing Tap is a high-precision thread reconditioning tool specifically designed for Caterpillar engine headbolts. It restores proper engagement to the 3/4-16 UNF headbolt threads, especially in the 3400 series heads, by cleaning burrs, corrosion, and damage from the threaded hole.
Used in engine rebuilds and head refurbishment work, this chasing tap enables correct bolt seating, consistent torque application, and improved gasket sealing. It helps avoid head gasket failures and ensures long-term reliability when installing cylinder heads.
Applications & Highlights
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Intended for Caterpillar 3400 / 3406 / 3408 / 3200 series headbolt thread repair
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Restores 3/4″-16 threads to factory condition
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Minimizes risk of stripped holes or cracked threads
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Durable construction for repeated shop use
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Ideal for use during head rebuild, engine overhaul, or gasket replacement operations
Made In USA
