Baer Heli Coil Tap - Wire Thread Insert - Bottoming Tap (STI) - Metric - M39 x 3

Meet the Baer Heli Coil Tap—the precision tool you reach for when thread repair and reinforcement are non-negotiable. Engineered for metric applications, this Bottoming Tap (STI) is tailored for M39 x 3 threads, delivering a clean, accurate thread form that guarantees reliable engagement with Helicoil inserts and bolts alike. This isn’t just tapping; it’s restoring strength where it matters most.

• Durable, precision-ground HSSG construction: Crafted from high-speed steel with meticulously ground threads, this tap delivers consistent cutting action and extended tool life, even when workpieces are tough or aged. The result is dependable thread formation that stays true‑to‑form for Helicoil inserts.
• Bottoming design for full-depth threads: The bottoming lead ensures you reach the complete thread profile to the bottom of the hole, which is essential for clean insert seating and predictable load distribution. This is the hallmark of STI bottoming taps used in coil-insert applications.
• Metric precision for reliable inserts: Sized for metric thread repair and reinforcement, the tool aligns with standard helicoil/STI practices to produce threads that match inserts and bolts with minimal guesswork. Metric STI taps and inserts are a well-established pairing in professional repair workflows.
• Ideal for thread repair and reinforcement: Perfect when threads are stripped or damaged and you need to restore original strength. This tap pairs with Helicoil inserts to restore critical mounting points in steel, aluminum, and other common substrates, delivering durable, reloadable threads.
• Professional-grade tool for shops and serious DIY: With its dedicated STI geometry and robust construction, it reduces the risk of over- or under-tapping and supports repeatable results across multiple repairs, saving time and costly downtimes.

How it works with inserts: after drilling the repair hole, use the STI bottoming tap to cut the precise thread that the Helicoil insert requires. Install the coil insert with the appropriate installation tool until it sits flush, then drive the bolt with confidence. The result is a repair that behaves like a factory thread—strong, reloadable, and ready for continued use.