BILITOOLS 3/8-16 inch Thread Repair Kit, HSS Drill Helicoil Repair Kit SAE — Open-Box, 23% Off

Used for repairing damaged or stripped internal threads and creating a stronger internal thread.

Suitable for all metals, composites, polymers and other materials. Our thread repair kit can be widely used in automotive and plumbing applications.

304 Stainless thread inserts create longer lasting durable threads, increase the possibility of higher torque application in weaker metals. 135° apex angle of twist drills, with stronger metal penetration and higher efficiency

Thread repair kit includes a collection of tools including HSS drill, tap, thread inserts, installation tool, break pin tool.

All the parts are organized in a convenient iron case for easy transport and storage between jobs. Attention: Before you buy this kit, please make sure which size do you need. If you don't know, Please see the picture 6.

Designed for reliable and lasting repairs, this complete HSS helicoil kit restores damaged or stripped 3/8-16 UNC internal threads using durable 304 stainless steel inserts that outperform the original thread strength. Suitable for metals, composites, and polymers, the kit contains every tool needed for precision thread restoration: a high‑speed steel drill with a 135° split‑point tip for fast, clean drilling, a matching SAE tap, corrosion‑resistant stainless thread inserts, an installation mandrel, and a break‑off tool—all housed in a rugged iron case that keeps components organized and protected on the job. The 304 stainless inserts provide superior corrosion resistance and increased load‑bearing capacity, enabling higher torque application in softer materials such as aluminum cylinder heads, intake manifolds, transmission housings, and plumbing fixtures. Whether you’re repairing automotive engine components, industrial equipment, or household plumbing systems, this kit delivers a factory‑ready threaded solution that stands up to repeated use and harsh environments.