The Baer Heli Coil Tap - Wire Thread Insert - Bottoming Tap (STI) - BSW - 9/16 x 12 is the precise, hard-working tool your shop reaches for when threads have given way and you need a dependable repair or reinforcement. This is the single, purpose-built tap you use to create clean, full-depth internal threads that accept helicoil or other wire-thread inserts with confidence.

Designed for durability and consistency, this bottoming tap is engineered from HSSG (high-speed steel ground) to stand up to tough materials and repeated use. The square drive ensures a solid, repeatable grip in your tap wrench or machine setup, while the bottoming flute geometry delivers full-thread engagement all the way to the bottom of the hole. That means plated, cast, or ductile materials get true, true threads, ready for heavy fastener loading.

• Material and build: HSSG construction for long life and reliable cutting performance in steel, cast iron, and aluminum.
• Thread specification: Precisely cut for BSW 9/16-12, ideal for restorations and reinforcements where standard taps fall short.
• Bottoming design: Full-depth threads to the bottom of the hole, essential for blind or recessed applications and for clean helicoil insert seating.
• Drive and compatibility: Square shank for secure engagement with common tap wrenches and hand/bench machines.
• Fractional fit, notable strength: When you need a repair that can handle load-bearing bolts without stripping, this tap helps restore original strength and reliability.

What makes this Baer Heli Coil Tap stand out? It’s not just about cutting threads—it’s about creating repair-ready holes that accept wire-thread inserts with minimal fuss and maximum durability. The combination of bottoming geometry, robust HSSG material, and a precise 9/16-12 BSW thread path means fewer retries, less chatter, and a secure, long-lasting repair in automotive, industrial, and workshop settings.

Ideal use cases include repairing stripped threads on engine blocks, transmission casings, suspension components, and equipment housings where a helicoil or reinforcing insert is the preferred fix. It’s equally valuable for preventative maintenance when preparing new holes for reinforced fasteners in heavy equipment or machinery.

Practical tips for best results:

• Use appropriate cutting fluid or light oil to reduce friction and extend tool life.
• Align the tap square to the workpiece to avoid cross-threading and ensure true thread form.
• Tap at a steady, controlled speed; back off periodically to clear chips and prevent binding.
• Test the repaired hole with the corresponding fastener before reloading critical loads.

Care and maintenance keep the tap clean and dry after use, store it in its intended holder, and avoid forcing the tool through with excessive torque. With proper care, the Baer Heli Coil Tap delivers consistent performance across repairs and reinforcements, helping you extend the life of assemblies and improve maintenance reliability.