BILITOOLS Helicoil Thread Repair Kit Metric M5–M12 — 304 Stainless Inserts & HSS Drills/Taps, Blow-Mold Case

BILITOOLS Helicoil Thread Repair Kit Metric is a complete thread-repair set with 304 stainless inserts, HSS drills and taps designed to restore and strengthen damaged internal threads from M5 to M12.

This kit brings together the core tools needed to repair stripped or worn metric threads and to create higher-strength internal threads in weaker materials. Everything fits into a blow-molded case for workshop or mobile use. The combination of hardened 4241 HSS drills and taps plus corrosion-resistant 304 stainless inserts helps deliver durable, torque-ready threads across metals, composites and plastics.

What sizes and components are included in this metric Helicoil set?

The kit supplies a range of commonly used metric sizes and the matching tooling to install each insert. It includes drills, taps, break-out tools and a large quantity of 304 stainless threaded inserts so you can repair multiple fasteners without replenishing stock quickly.

• Drills: 5 pcs 4241 HSS drill bits (one per size)
• Taps: 5 pcs 4241 HSS taps (one per size)
• Break pin tools: 5 pcs for insert tang removal
• Thread inserts: 25 each of M5 x 0.8, M6 x 1.0, M8 x 1.25, M10 x 1.5; 10 each of M12 x 1.75
• Packaged in a blow-molded carrying case

How does this kit make stripped threads stronger and longer lasting?

304 stainless steel inserts reline the original hole, creating a corrosion-resistant, wear-resistant internal thread that accepts higher torque than many base materials alone. Using properly sized HSS drills and taps ensures accurate preparation so inserts seat flush and engage fully.

• Stainless inserts resist wear and corrosion compared with raw tapped holes
• HSS 4241 drills with 135° apex angle for efficient metal penetration
• Taps cut precise repair threads for full insert engagement
• Break pin tools remove tangs cleanly after installation

Which materials and applications is the Helicoil kit suitable for?

The kit is built for versatility: it works in ferrous and non-ferrous metals, composites and many engineering plastics. It's especially useful where the base material is softer or has lost thread strength—common in automotive, plumbing, machinery and maintenance work.

• Automotive engine blocks, cylinder heads and mounting points
• Plumbing fittings and metal housings prone to thread wear
• Repair of aluminum parts and castings where original threads fail
• Maintenance tasks on equipment and industrial machinery

What tools and technique tips ensure a correct installation?

Follow a consistent sequence: drill to the recommended diameter, tap the hole, insert the coil with the installer, and break off the tang. Using the included HSS drill and tap sized for each insert helps avoid over- or under-sizing and preserves alignment for reliable thread engagement.

• Use the matching HSS drill bit supplied for the insert size
• Keep drill and tap perpendicular to avoid misalignment
• Apply cutting lubricant when tapping metals for cleaner cuts
• Use the break pin tool to remove the tang without damaging threads

Who is this for: The BILITOOLS Helicoil Thread Repair Kit Metric is for mechanics, maintenance technicians, DIYers and fabricators who need a reliable way to restore or upgrade internal threads. It’s ideal for people who work on cars, small engines, industrial equipment or any project where stripped metric threads must be repaired quickly and with durable results. The organized case and the range of inserts make this kit suitable for both mobile service calls and shop benches.