Baer Heli Coil Tap - Wire Thread Insert - Bottoming Tap (STI) - UNF - 7/8 x 14

When threaded holes take a beating, this Heli Coil Tap is your go-to tool for restoring strength and reliability. Specifically engineered to work with Heli-Coil wire thread inserts, it delivers clean, precise internal threads that stand up to the demands of repeated assembly and disassembly in challenging environments. The result is renewed hole integrity and a repair you can trust in critical applications.

Why this tap stands out

• Bottoming precision for blind holes — the bottoming geometry reaches the full thread depth, ensuring the insert sits properly and engages fully from top to bottom.
• UNF compatibility — designed for 7/8 x 14 unified National Fine threads, so you can confidently repair or reinforce holes that require a fine-pitched standard.
• Designed for durable repairs — engineered to produce strong, long-lasting threads that resist pull-out and wear, even in high-stress environments.
• Optimized for Heli-Coil inserts — precisely paired with coil inserts to restore original thread strength and torque capacity without compromising hole geometry.
• Built for repeated use — constructed to withstand routine tapping in a variety of materials, making it a dependable choice for shops and workbenches alike.

Ideal applications

Perfect for automotive, industrial, and workshop repairs where threaded holes have become weakened or damaged. Use it to:

• Rebuild stripped or worn UNF 7/8-14 threads in automotive blocks, engine components, and transmission housings.
• Repair threaded receptacles in machinery housings, brackets, and equipment mounts that require reliable load-bearing threads.
• Prepare clean, accurate internal threads for Heli-Coil inserts, restoring original strength and service life.

How it helps your workflow

With the Baer Heli Coil Tap, you gain predictable results time after time. The tap’s geometry creates consistent thread profiles, reducing the risk of cross-threading and ensuring the insert seats smoothly. That means faster repairs, fewer follow-up adjustments, and a durable repair you can rely on in the field or the shop.

Key specifications at a glance

• Thread type: UNF
• Size: 7/8 x 14
• Design: Bottoming tap (STI) for full-depth threads
• Application: Preparation for Heli-Coil wire thread inserts

Practical tips for best results

• Use proper tapping fluid to reduce friction and extend tool life.
• Keep the hole aligned to prevent thread distortion; slow, steady strokes help maintain accuracy.
• Clean the hole thoroughly after tapping to remove chips before installing the coil insert.
• Follow insert manufacturer guidelines for seating depth and torque limits to maximize strength.

Maintenance and care

After use, wipe the tap clean to remove metal shavings and inspect for any burrs or wear. Store in a dry, organized case to preserve edge sharpness and prevent corrosion. Regular inspection and careful use will extend the life of this essential repair tool.

Upgrade your repair toolkit with the Baer Heli Coil Tap and deliver durable, reliable thread repairs that stand up to real-world use. Whether you’re a professional machinist, a maintenance technician, or a serious hobbyist, this bottoming tap is built to help you reclaim threaded holes and keep equipment functioning at peak performance.