Baer Heli Coil Tap - Wire Thread Insert - Bottoming Tap (STI) - UNC - 1.1/4 x 7

The Baer Heli Coil Tap is a precision instrument designed for durable, professional-grade internal threading with Heli-Coil wire thread inserts. Built for reliability, this Bottoming Tap (STI) is engineered to cut clean, full-depth threads all the way to the bottom of a hole, making it the ideal companion for repairing and reinforcing critical threads in metal parts and assemblies.

Why this bottoming tap stands out

• Full-depth threading that reaches the hole bottom, ensuring proper seat and engagement for helicoil inserts in blind or recessed holes.
• STI bottoming design tailored for installations where depth matters, reducing the need for retapping and ensuring consistent thread pitch throughout.
• UNC compatibility with a 1-1/4" diameter and 7 TPI, matching common imperial thread standards and enabling dependable fitment with widely used fasteners and inserts.
• High-speed steel construction (HSS-G) delivers durability and wear resistance, maintaining sharpness for repeated use in metalworking projects.
• Precisely ground for clean chips and smooth cutting, helping minimize galling and deliver repeatable results across a range of materials.

Ideal use cases

This tap is purpose-built for creating or restoring robust internal threads that will accept Heli-Coil wire thread inserts. It excels in scenarios like repairing stripped threads in automotive components, machinery housings, motorcycle parts, or any equipment where a reinforced, long-lasting threaded hole is essential. Because it’s designed to work with helicoil inserts, you gain restored strength that often exceeds the original threaded engagement.

How it helps you work smarter

• Repair with confidence Restore damaged holes without costly replacements. A single, correctly cut bottoming tap ensures the insert seats fully and evenly.
• Durable performance The combination of HSS-G steel and precise geometry means you’ll get consistent threads project after project, even in tougher metals.
• Professional-grade results Achieve clean, true threads that improve fastener seating, clamp load distribution, and vibration resistance in critical assemblies.
• Versatile depth control The bottoming design provides predictable depth engagement, reducing guesswork during helicoil installation.

Tips for optimal results

For best outcomes, pair this Bottoming Tap with a compatible helicoil insert kit and the proper drill size. Use cutting oil or lubricant to reduce heat and extend tap life, apply steady, even pressure, and rotate in a single direction with controlled back-off to clear chips. Maintain a clean hole and deburr edges before tapping to ensure smooth thread formation and reliable insert seating.

What you gain with the Baer Heli Coil Tap

Durability, precision, and a workflow that supports quick repairs and repeatable performance. By providing full-depth threads in UNC 1-1/4 x 7, this tap helps you accelerate repairs, extend the life of critical components, and maintain high standards of reliability across metalworking, automotive, and industrial applications.