Precision-engineered Baer Heli Coil Tap for reliable thread repairs and reinforcement with wire thread inserts. This Bottoming Tap (STI) in BSF 5/8 x 14 is built to cut clean, full-depth threads that resist wear and withstand repeated insert cycles in demanding applications. Designed to work seamlessly with Heli-Coil wire thread inserts, it delivers consistent performance across a range of materials and environments.

What sets the Baer Heli Coil Tap apart

• Bottoming tap design ensures threads extend to the full depth of blind holes, delivering dependable engagement for Heli-Coil inserts and maximum pull-out resistance.
• BSF 5/8 x 14 specification provides precise compatibility for British Standard Fine threads, making it a trusted choice for vintage equipment, aerospace components, and specialty machinery that use BSF standards.
• High-precision geometry with carefully ground flutes and tooling land for smoother cutting, reduced chatter, and tighter tolerances—even in harder metals.
• Durable construction built to handle repeated use in repair and reinforcement tasks, giving you long service life and consistent results.
• Designed for inserts by aligning perfectly with wire thread inserts, helping you restore strength to damaged threads without compromising the host material.

Ideal use cases

This tap is the go-to choice when you need to repair or create robust internal threads that will accept Heli-Coil inserts. It shines in scenarios like:

• Repairing stripped BSF threads in castings, aluminum blocks, or engine components where a secure insert is essential.
• Chasing new, clean threads in limited-depth cavities where a full-depth cut is required for reliable insert engagement.
• Preparing precision housings and mechanical assemblies that demand accurate, repeatable thread terms for interchangeability and long-term durability.

Practical tips for best results

• Match the bottoming tap to a compatible drill size recommended for your Heli-Coil insert to achieve optimal thread depth and grip.
• Use steady cutting pressure and proper lubrication to minimize heat build-up and extend tool life during thread formation.
• Inspect the cut threads with a thread gauge after tapping to confirm depth and alignment before installing the insert.
• Pair with the appropriate Heli-Coil kit for a reliable, vibration-resistant repair that restores original strength.

What you get

A dedicated bottoming tap that delivers precise BSF 5/8 x 14 threads for secure insert installation, designed to integrate smoothly into professional machining workflows and ensure repeatable, high-quality results.

When precision matters and thread longevity is non-negotiable, the Baer Heli Coil Tap is the tool you reach for first.