Baer Heli Coil Tap - Wire Thread Insert - Bottoming Tap (STI) - BSF - 3/8 x 20

When threads must withstand repeated assembly, the Baer Heli Coil Tap delivers precise, durable threads designed to partner with wire-thread inserts like Helicoil and Recoil. This Bottoming Tap (STI) in BSF 3/8 x 20 is engineered to cut true, load-bearing threads that accept inserts for reinforcement in soft or damaged materials.

Precision engineering for reliable thread repair

The BaerCoil Heli Coil Tap uses a robust HSS-G composition and exacting ground geometry to produce clean, accurate threads that seat inserts squarely. The bottoming design lets you reach the full depth of the hole, ensuring the insert has a solid, long-lasting seat. These taps are specifically sized as BSF 3/8 x 20 and are intended to produce an oversized thread in the base metal so the inserted coil can grip securely for high-load applications.

Evidence-based details from trusted sources confirm the availability of STI taps in BSF 3/8 x 20 and their role in creating oversized, insert-ready threads.

• Oversize-for-inserts design: The tap is built to create a receiving thread that accepts standard wire-thread inserts (Helicoil, Recoil, Perma-Coil) at 3/8 x 20 BSF, enabling repair without replacing the entire component.
• Bottoming geometry: Reaches full thread depth, ensuring consistent engagement with the insert and preventing pull-out under load.
• Durable construction: High-speed steel ground to precise tolerances, designed for repeated use in workshop environments.
• Versatile compatibility: Works with a range of standard wire-thread inserts and is suitable for automotive, equipment, and fabrication tasks where BSF 3/8 x 20 threads must be repaired or reinforced.

Who this is for: technicians, machine shops, hobbyists, and maintenance crews who routinely repair stripped or damaged threads in soft metals or alloy housings. Use cases include repairing engine components, brackets, and other assemblies that rely on secure, repeatable fastening. By restoring thread strength with a proper coil insert, you reduce replacement costs and downtime while restoring performance.

Practical tips: pair this bottoming tap with appropriate tapping lubricant and the correct pre-drill size for BSF 3/8 x 20; ensure the tap is perpendicular to the workpiece; advance steadily, then back off slightly to clear chips and maintain thread quality. Always follow insert manufacturer guidance for the coil insert you’re using.

Technical snapshot

Thread form: BSF; Size: 3/8 x 20; Tool type: Bottoming tap; Material: HSS-G; Application: Enabling reliable wire-thread insert seating for repairs.