Baer Heli Coil Tap - Wire Thread Insert - Bottoming Tap (STI) - UNF - No. 4 x 48

The Baer Heli Coil Tap is the precise, durable tool you reach for when you need dependable thread repairs and reinforced holes with a Heli-Coil wire-thread insert system. Designed for the No. 4-48 UNF bottoming tap specification, it cuts clean, full-depth threads so the insert seats securely every time, restoring strength to weakened threads in a variety of metals and applications.

With a focus on longevity and consistency, this tap is built to stand up to repeated use in demanding environments. Its geometry is optimized for precise engagement with Heli-Coil inserts, delivering burr-free threads that improve insert performance and torque-tolerance. The bottoming design means you can reach the last depth of the hole, ensuring a complete, reliable thread engagement for critical fasteners.

• Bottoming tap design (STI): achieves full thread depth for flawless insert seating and maximum strength in the repaired hole.
• UNF No. 4 x 48 compatibility: ideal for high-density, fine-thread fasteners commonly used in precision equipment and automotive work.
• Optimized for Heli-Coil inserts: creates the exact thread form required for reliable coil-insert reinforcement.
• Durable construction: engineered for repeated use in metal, with a tough, wear-resistant profile that resists lengthwise wear and deflection.
• Clean, burr-free results: precise cutting edges minimize debris and chatter, making installation smoother and faster.
• Versatile repair tool: perfect for repairing stripped holes, restoring thread integrity in aluminum, steel, or other common base materials.

Ideal for machine shops, automotive tuners, and maintenance professionals, this tap helps you reclaim damaged threads without resorting to oversized repairs or replacements. Use it with the corresponding Heli-Coil inserts to restore original strength and service life to fastened joints, fixtures, and housings. For reliable, repeatable results on critical holes, trust the Baer Heli Coil Tap to deliver every time.