Baer Heli Coil Tap - Wire Thread Insert - Bottoming Tap (STI) - UNC - 3/4 x 10

The Baer Heli Coil Tap is the precise bottoming tap you rely on for impeccable thread repairs and reinforced holes using Heli-Coil wire thread inserts. Sized specifically for UNC 3/4 x 10 holes, this tool delivers clean, full-depth threads that give inserts and fasteners a secure, long-lasting grip in a range of metals and applications.

Why this bottoming tap matters

• Bottoming geometry for full-depth threads — reach the very bottom of the hole so the insert seats flush and the fastener pulls evenly across the engagement length.
• Designed for Heli-Coil inserts — engineered to partner with standard wire thread inserts, ensuring consistent alignment and reliable performance in repair work.
• Durable build for demanding work — crafted to maintain sharp cutting edges and precise thread form through repeated use, reducing the need for rework.
• UNS/UNC 3/4-10 compatibility — tailored to the common UNC size, making it a go-to choice for restoring or reinforcing larger threaded holes in machinery, automotive components, and equipment housings.
• Material and precision you can trust — built for durability in metalworking environments, helping you achieve repeatable results every time.

Ideal use scenarios

• Automotive repairs where worn or stripped threaded holes need reinforcement to restore clamping force and reliability.
• Machining and maintenance tasks in shops and on the factory floor where fasteners must hold under load and vibration.
• Repairs on engine blocks, transmission housings, and equipment housings requiring durable, repeatable thread engagement.
• Projects that rely on reusable Heli-Coil inserts to extend the life of critical joints without replacing whole components.

How to use (high-level guidance)

1. Prepare the hole to the standard size for UNC 3/4-10 inserts using the appropriate pilot hole as specified for your repair scenario.
2. Use the Baer Heli Coil Tap to cut full-depth threads with a bottoming action, ensuring the thread form reaches the bottom of the hole.
3. Clean the hole and apply light cutting fluid or oil to improve chip evacuation and tool life.
4. Install the Heli-Coil insert with the matching installation tool until it sits flush with the surface, then break off the tang as required.
5. Thread a test fastener to verify full engagement and seating depth before putting the assembly into service.

What makes the Baer Heli Coil Tap stand apart

• Specialized for Heli-Coil wire thread inserts, delivering predictable thread geometry and insert compatibility.
• Bottoming design ensures complete thread depth, reducing install errors and improving long-term strength.
• Robust construction tailored to the UNC 3/4 x 10 standard, making it a dependable choice for professional shops and serious hobbyists.

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