Baer Heli Coil Tap - Wire Thread Insert - Bottoming Tap (STI) - UNC - 5/16 x 18

Introducing the Baer Heli Coil Tap - Wire Thread Insert - Bottoming Tap (STI) - UNC - 5/16 x 18, the precision tool you rely on for flawless thread repairs and reinforced, long-lasting threads. Designed to pair seamlessly with Heli-Coil wire thread inserts, this bottoming tap delivers clean, true-to-size internal threads that won’t back out under load. Built for durability and consistent performance, it’s the workhorse you reach for when accuracy matters most.

Why this bottoming tap stands out

The Baer Heli Coil Tap features a robust bottoming geometry that reaches full thread depth, ensuring the insert seats correctly and the repaired hole achieves maximum grip. The square drive end provides reliable engagement with your tap wrench or drill press, minimizing wandering and cross-threading. Crafted for durability, this tap holds up to repeated use in common metalworking materials while delivering precise, repeatable results each time.

• UNC 5/16 x 18 compatibility matches standard fasteners and common automotive, machinery, and equipment applications.
• Bottoming geometry ensures full-depth threads to properly anchor Heli-Coil inserts and restore original strength.
• Square drive feature for solid torque transfer and alignment in manual or powered tapping setups.
• Durable construction designed to resist wear, delivering consistent performance across multiple repairs.
• Optimized for insert installations creating clean, reliable threads that reduce pull-out and strip risk.

Ideal uses and practical scenarios

Use the Baer Heli Coil Tap when you need to repair damaged threads or reinforce critical holes in engines, transmissions, or machine housings where 5/16-18 UNC threads are standard. It’s particularly effective for restoring bolt holes in aluminum blocks, steel components, or other assemblies that must withstand vibration, heat, and load without compromising clamp force. Whether you’re a professional shop tech or a serious DIYer, this tap helps you achieve shop-quality results in less time.

How to get the best results

For optimal performance, apply a light cutting fluid and maintain steady, straight-line pressure while turning. Tap slowly to avoid chip buildup, and back off periodically to break chips. After tapping, install the Heli-Coil insert with the appropriate installation tool, then verify that the insert sits flush and the fastener threads freely and securely. With proper technique and the Baer Heli Coil Tap, you’ll recover thread integrity and extend the life of fastened joints.

Choose the Baer Heli Coil Tap - Wire Thread Insert - Bottoming Tap (STI) UNC - 5/16 x 18 for reliable, repeatable thread restoration that stands up to real-world use. It’s precision, durability, and performance you can trust when it matters most.