Baer Heli Coil Tap - Wire Thread Insert - Bottoming Tap (STI) - BS. Brass - 5/16 x 26

The Baer Heli Coil Tap is the precision tool you reach for when repairing or reinforcing threads with wire thread inserts. Sized for 5/16 x 26 applications, this bottoming tap (STI) delivers clean, true threads that align perfectly with Heli-Coil style inserts, restoring strength to worn or damaged holes and extending the life of your assemblies.

Why this tap stands out

• Bottoming design for blind holes — reaches the full depth of a blind hole to ensure complete engagement and reliable insert installation without guesswork.
• Durable, precision-made construction — crafted from hardened high-speed steel (HSSG) for long tool life and consistent thread quality, even after repeated use.
• Exact 5/16 x 26 dimension — engineered for standard hardware and fasteners, delivering compatibility with a wide range of components that use 5/16-26 threads.
• Optimized for wire thread inserts — designed to paired with Heli-Coil style inserts to create strong, corrosion-resistant threads in soft metals and challenging materials.

How it helps you in real-world scenarios

• Automotive repairs where a stripped bore needs a robust, repeatable thread for mounting brackets, engine components, or housings.
• Machinery maintenance tasks that require dependable, field-ready repairs in aluminum, steel, or cast materials.
• Fixture and enclosure work where bottoming taps ensure complete thread depth, preventing pull-out and improving fastener security.

Usage tips for best results

• Use a proper tapping fluid or light cutting oil to minimize heat and extend tool life.
• Advance gradually with steady, square motion to maintain true alignment and minimize chip buildup.
• Keep the hole clean as you progress to the bottoming point to avoid binding or cross-threading.

This tap is an essential addition to any toolbox that handles thread repairs, reinforcing confidence in every threaded connection you restore. The included Baer logo image below reflects the trusted brand you’re choosing for durable, reliable tooling.