Baer Heli Coil Tap - Wire Thread Insert - Bottoming Tap (STI) - UNC - 7/8 x 9

The Baer Heli Coil Tap is the bottoming tap you reach for when you need impeccable thread repairs and reinforcements. Engineered to pair seamlessly with Heli-Coil wire thread inserts, this UNC 7/8 x 9 bottoming tap delivers precise, clean threads that restore strength where it matters most.

Crafted for durability, the tap is machined to rugged reliability with high-speed steel (HSS-G) construction. Its bottoming geometry reaches the full thread depth in blind holes, producing a consistent thread profile that the helicoil insert can bite into with confidence. The result is renewed thread integrity that stands up to repeated disassembly and heavy use.

• Bottoming geometry enables full-depth threads in blind holes, ensuring complete engagement with inserts.
• HSS-G construction provides enhanced wear resistance and long life in steel, aluminum, and other common base metals.
• UNC 7/8 x 9 thread compatibility matches standard fastener sizes for a wide range of automotive, machinery, and industrial applications.
• Designed for Heli-Coil inserts—creates clean, repair-ready threads that restore original strength and reliability.
• Precision, repeatable results reduce the risk of cross-threading and misalignment during installation.

Who this is for: automotive technicians, machinists, equipment rebuilders, and serious DIY enthusiasts who routinely encounter stripped or damaged UNC threads and need dependable, long-lasting repairs. Whether you’re restoring an engine block, cylinder head, transmission housing, or a critical mounting point, this tap delivers the controlled, accurate thread formation that helicoil reinforcement demands.

Key advantages over generic taps include its dedicated bottoming geometry for complete thread depth, compatibility with standard Heli-Coil inserts, and durable HSS-G construction that keeps its edge through tough repair jobs. When precise thread repair matters, this tap helps you achieve proper fastener engagement, improved load transfer, and extended component life.

Practical tips for best results: work with a light cutting oil or lubricant to reduce heat and chip buildup, keep the tap perfectly aligned with the hole axis, and tap gradually to the full depth. After tapping, clean the hole thoroughly before installing the Heli-Coil insert to ensure optimal grip and longevity.

Invest in the Baer Heli Coil Tap to ensure durable, repair-ready threads that keep bolts secure and equipment performing at peak. For professionals and serious hobbyists alike, this is the tool that makes trusted thread repairs repeatable and reliable.