BILITOOLS M12x1.5 Thread Repair Kit

BILITOOLS M12x1.5 Thread Repair Kit is a complete Helicoil-style repair set that restores stripped M12x1.5 internal threads and installs durable 304 stainless steel inserts for long-lasting strength.

When an important bolt hole is damaged, replacing the part or welding and re-tapping can be costly and time-consuming. This BILITOOLS kit gives you the parts and tools to repair stripped or worn M12x1.5 threads quickly using high-speed steel (HSS) drills, a purpose-made tap, stainless steel coil inserts, and installation and break-off tools. Everything arrives neatly organized in a compact iron case so you can carry the kit to the job and keep small components secure between jobs.

How does this kit restore a stripped M12x1.5 thread?

First, you re-drill the damaged hole to the correct oversize using the included HSS drill bit. Next, use the supplied tap to cut new threads sized for the stainless coil insert. Finally, wind the 304 stainless insert into place with the installer and snap off the tang with the break pin tool, leaving a new, full-strength internal thread.

• HSS drill with 135° apex for efficient metal cutting.
• Thread tap sized for insert seating and correct pitch engagement.
• 304 stainless steel inserts provide corrosion resistance and higher torque capacity.
• Installer and break pin tool for clean, repeatable installation.

What materials and applications is the kit suitable for?

The kit is designed to work across a wide range of base materials including soft metals, harder alloys, composites and many polymers. That versatility makes it suitable for common automotive repair tasks, plumbing fittings, machinery maintenance, and general fabrication work where internal threads have been stripped or worn.

• Works on aluminum, cast iron, steel, brass, composites, and plastics.
• Useful for engine blocks, transmission housings, manifolds, and plumbing fixtures.
• 304 stainless inserts reduce galling and extend thread life in corrosive environments.
• Handy for field repairs or workshop maintenance where part replacement is impractical.

What tools and parts are included and how are they organized?

The kit contains a complete sequence of tools to complete an M12x1.5 Helicoil-style repair: drill, tap, multiple 304 stainless inserts, installation driver, and break pin removal tool. All components are housed in a durable iron case with molded compartments so small inserts and pins stay organized and are easy to find on the job.

• HSS drill bit optimized for aggressive cutting and chip clearance.
• Tap manufactured to match insert outer thread geometry for precise fit.
• Set of 304 stainless inserts to re-establish thread engagement and torque capacity.
• Installation tool and break-off tool for quick, repeatable installs.

Which measurements should you confirm before buying?

Before purchasing, verify that the damaged thread is M12x1.5 (12 mm diameter with 1.5 mm pitch). If the size is uncertain, consult the product images that illustrate insert dimensions and application or measure the bolt that originally fit the hole. Choosing the correct size is essential to ensure the insert seats properly and the repair performs reliably.

• Confirm nominal thread diameter: M12, pitch: 1.5 mm.
• Check the bolt or mating part for thread compatibility before ordering.
• Refer to the included sizing diagram (see image 6) if unsure of measurement.
• Contact support if you need help identifying the correct kit size.

Who is this for: The BILITOOLS M12x1.5 Thread Repair Kit suits mechanics, fabricators, plumbers, and DIYers who need a portable, professional-grade solution for restoring stripped internal threads without replacing parts. It’s ideal when repairs must be completed cleanly and quickly with components that resist corrosion and allow higher torque in weakened base materials.