Baer Heli Coil Tap - Wire Thread Insert - Bottoming Tap (STI) - UNF - 1.3/8 x 12

When 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.

Why this matters in practice: a bottoming tap that reaches the full thread depth ensures the Heli-Coil insert seats correctly and provides a stable, load-distributing thread core. This means faster repairs, fewer reworks, and components that hold up under repeated fastening cycles in demanding environments—from automotive and machinery to industrial equipment.

• Bottoming design guarantees full-depth UNF threads to the bottom of the hole, ensuring the Heli-Coil insert seats flush and performs at peak strength.
• UNF compatibility for 1-3/8" diameter holes with 12 TPI threads delivers precise, reliable thread formation.
• Ideal for repairing worn or stripped internal threads and reinforcing threaded holes that endure vibration and load.
• Designed for use with wire thread inserts, providing durable, repeatable performance across metal components.
• Professional-grade tool suited for maintenance, repair shops, and machining setups that demand consistent results.

• Prepare the hole, then use cutting oil or a suitable lubricant as you work the tap in smooth, steady motions to form accurate UNF threads.
• After tapping, install the Heli-Coil insert according to the manufacturer’s instructions and verify fit with the final fastener.

The Baer Heli Coil Tap is more than a tapping tool—it’s a dependable solution that brings damaged holes back to original strength, enabling secure fastenings and long-lasting performance in a compact, easy-to-use package.