The Baer Heli Coil Tap - Wire Thread Insert - Bottoming Tap (STI) - BSF - 9/16 x 16 is your go-to tool for restoring damaged threads and reinforcing critical joints with durable, premium performance. This bottoming tap is specifically designed to cut BSF threads at 9/16" diameter with 16 threads per inch, delivering precise, true threads that meet exacting standards. Paired with Heli-Coil wire thread inserts, it provides a reliable path to rebuild lost strength in metal components and maintain peak functionality under load.

The images showcase the tool from multiple angles, illustrating its robust, cylindrical form and precision-ground cutting edges that ensure smooth, burr-minimized tapping. The design is optimized for clean chip evacuation and steady progression, giving you consistent results even in challenging materials.

Why this bottoming tap stands out

• Bottoming geometry for full-depth threads—cuts the thread to the bottom of the hole, ensuring every insert seats squarely and fasteners engage fully.
• BSF 9/16 x 16 specification—tailored for BSF threaded applications where precise fit and load distribution are critical.
• Reliable with Heli-Coil inserts—designed to create clean grooves that let wire thread inserts bite securely, restoring original strength and service life.
• Durable, precision-ground construction—built to withstand repeated use in workshop environments, delivering consistent performance over time.

Ideal for automotive, industrial, and machinery repairs where stripped or worn threads threaten component integrity. Use this tap to restore threaded holes in steel, cast iron, and aluminum components, then reinforce with a compatible Heli-Coil insert for renewed load-bearing capacity. This tool is a practical choice for machinists, fabricators, and serious DIY enthusiasts who demand reliable thread restoration without compromise.

Practical tips for best results: choose the correct pilot hole size per BSF guidelines, apply a suitable cutting fluid to reduce friction, and rotate the tap with steady, even pressure to prevent chatter. After tapping, clean the hole, install the Heli-Coil insert according to the manufacturer's instructions, and verify the fastener seating with a test torque to ensure a secure, durable repair.