Baer Heli Coil Tap - Wire Thread Insert - Bottoming Tap (STI) - UNF - 1.3/8 x 12 G 87mm is a precision bore

87mm is a precision bore tool designed for accurate

HSS (M2): Ensures secure tool seating in common holders with a durable cutting edge for longer life

Its half-tipped design combines durable wear resistance with controlled contact

Short flute length for rigidity: The 3-5xD flute length minimizes tool flex and deflection

Designed for machinists who need clean

Baer Heli Coil Tap - Wire Thread Insert - Bottoming Tap (STI) - UNF - 1.3/8 x 12 G 87mm is a precision boreWhen a critical thread is damaged, the Baer Heli Coil Tap delivers the precision and durability you need for reliable thread repair and reinforcement. This Bottoming Tap (STI) is specifically designed for UNF threads in 1 3 8" diameter holes with 12 threads per inch, making it the ideal companion for wire thread inserts and Heli Coil installations. Built to endure heavy use, it creates clean, full depth threads that restore strength where it counts.