Baer Heli Coil Tap - Wire Thread Insert - Bottoming Tap (STI) - BSF - 7/8 x 11

The Heli Coil Tap you need for impeccably repaired and reinforced threads. Crafted with purpose-built precision, this bottoming tap is designed to cut clean, accurate internal threads that perfectly align with Heli-Coil style wire thread inserts. When a hole has lost its grip or stripped threads, this tool becomes the reliable partner you reach for first.

Why this tap stands out

• Bottoming design for full-depth precision: The tap reaches the deepest part of the hole, ensuring a complete thread to the bottom where the insert will seat, so you get uniform engagement every time.
• BSF 7/8 x 11 specification: Precisely matched to British Standard Fine thread standards, delivering the correct pitch and engagement for reliable insert performance.
• Dedicated for wire thread inserts: Specifically engineered to pair with Heli-Coil style inserts, delivering clean, repeatable threads that resist loosening under load.
• Durable, shop-ready reliability: Built for repeated use in a variety of common base materials, helping you restore strength to damaged holes without compromising surrounding material.
• Versatile, maintenance-friendly solution: Ideal for automotive, equipment, and general machine-shop repairs where threaded holes endure vibration and stress, and where a secure insert is the best long-term fix.

Practical use and outcomes

Use this tap to create the bedrock threads that accept a high-strength wire insert. When paired with the appropriate Heli-Coil insert, you’ll gain a repaired thread that seats firmly, resists pull-out under load, and restores original clamping force. It’s particularly valuable for cast aluminum and steel components that experience frequent removal and installation cycles, such as brackets, housings, and mounting points.

Pro tips for best results

• Confirm the hole’s material and ensure you choose the correct pilot hole size before tapping.
• Deburr the hole edge and use proper tapping fluid to reduce friction and extend tool life.
• Keep the tap perpendicular to the surface and apply steady, even pressure to avoid thread distortion.
• After tapping, clean chips thoroughly before installing the Heli-Coil insert to ensure a smooth, issue-free installation.