Baer Heli Coil Tap - Wire Thread Insert - Bottoming Tap (STI) - UNC - 5/8 x 11

The Baer Heli Coil Tap is the precision tool you reach for when thread repair and reinforcement truly matter. Crafted as a bottoming tap (STI) for UNC 5/8 x 11, this tap is engineered to cut clean, accurate internal threads that perfectly seat Helicoil-style wire thread inserts. With it, you’ll restore damaged holes or establish reinforced threads that resist pull-out under load.

Why this bottoming tap stands out

• HSSG construction—built on a high-speed steel ground substrate for durability, wear resistance, and consistent thread formation even after repeated use.
• Bottoming design—provides full-thread engagement to the bottom of the hole, ensuring precise depth and a reliable insert seat in blind or deep cavities.
• UNC 5/8 x 11 size—fits standard coarse-thread inserts and common repair scenarios across automotive, industrial, and machinery applications.
• Helicoil compatibility—specifically intended to prepare the hole for Helicoil or other coil inserts, delivering strong, load-bearing threads where strength matters most.
• Smooth, controlled cutting—flute geometry and edge geometry are optimized to minimize chatter and produce true threads that resist fatigue in metal substrates.

Ideal use cases

When you’re repairing stripped threads or reinforcing critical joints, this tap shines in automotive repairs (engine blocks, cylinder heads, and housings), machinery housings, and any blind-hole applications in aluminum, steel, or cast materials. It’s especially valuable where a secure seat for a coil insert translates to longer service life and easier maintenance.

How to get the best results

1. Verify the insert size and select the matching Helicoil kit for 5/8-11 UNC threads.
2. Pre-drill to the recommended pilot size, then tap with the Baer Heli Coil Tap until the full thread depth is reached.
3. Lubricate the tap suitably and back off occasionally to clear chips for a clean thread.
4. Install the wire thread insert per your insert kit instructions, then verify the seating depth and torques as required.

Who benefits most

machinists, maintenance technicians, automotive specialists, and do-it-yourself enthusiasts who value precision repairs and durable thread reinforcements that stand up to real-world use. If you’re aiming for professional-grade repairs that resist stripping and reduce future rework, this tap is a reliable, purpose-built choice.

With the Baer Heli Coil Tap in UNC 5/8 x 11, you’re not just forming threads—you’re creating lasting, serviceable connections that empower reliable performance across a range of demanding applications.