Baer Heli Coil Tap - Wire Thread Insert - Bottoming Tap (STI) - UNF - No. 6 x 40

Baer Heli Coil Tap — a precision bottoming tap built to forge durable, repair-ready threads for helicoil inserts. Engineered for No. 6-40 UNF threads, this tap ensures clean, accurate cuts that form the foundation for reliable coil inserts in a wide range of materials.

Key advantages you’ll notice in practice:

• Exact thread size: tuned for No. 6-40 UNF, the bolt-hole pairing is ideal for helicoil (STI) inserts and other 6-40 fasteners. UNF 6-40 is a standard small-diameter, fine-pitched thread commonly used in precision assemblies.
• Bottoming design for full depth: unlike entry-only taps, a bottoming tap travels to near the full depth of a blind hole, ensuring threads are formed all the way to the bottom where the helicoil sits. This is essential for secure insert seating and load distribution.
• Helicoil-compatible: designed to create the correct internal thread size so helicoil or other screw-thread inserts can be installed with confidence. This tap is a common finishing step in helicoil installation workflows.
• Material and geometry optimized for durability: built to survive routine shop use, delivering consistent cuts that preserve the integrity of surrounding material and prevent cross-threading during insert installation. (General industry practice for STI/bottoming taps.)
• Versatile use cases: ideal for repairing damaged threads or creating reliable foundations for helicoil inserts in aluminum, steel, or other common engineering metals encountered in maintenance and manufacturing environments. (Helicoil tap guides note 6-40 UNF as a standard insert size.)

Usage tip: Always pair this bottoming tap with the correct helicoil installation kit and the matching insert size. Align the tap straight, maintain steady pressure, and back out slowly to clear chips—this helps prevent cross-threading and ensures a clean, true thread for the insert. For reference, Helicoil and tap selection guides confirm the 6-40 UNF pairing and bottoming-tap roles in STI threading.

Whether you’re reviving worn threads on a critical component, repairing soft-metal housings, or supporting a high-cycle assembly, the Baer Heli Coil Tap gives you precise depth control and reliable thread formation every time. Invest in a tool that reduces rework, extends part life, and simplifies helicoil installation in tight or blind-hole situations.