BILITOOLS Helicoil Thread Repair Kit Metric M5–M12 — 304 Stainless Inserts, Blow-Molded Case

BILITOOLS Helicoil Thread Repair Kit Metric is a complete M5–M12 thread repair set that restores stripped internal threads and installs corrosion-resistant 304 stainless inserts for stronger, longer-lasting fastenings.

When a bolt hole is damaged, replacing the part can be costly and time-consuming. This all-in-one metric kit supplies drills, taps, install tools, break-off pins and a generous assortment of 304 stainless steel inserts so you can repair threads on engines, plumbing fittings, structural parts and assemblies quickly. Everything nests neatly in a blow-molded case for jobsite portability and organized storage.

How does the kit restore damaged threads effectively?

The kit removes the compromised thread and installs a stainless helicoil insert that recreates the original thread diameter and pitch while providing a fresh, corrosion-resistant surface. Inserts conform to standard metric sizes so you can use the same bolt sizes as before or choose a slightly stronger connection in weaker base materials.

• Includes HSS twist drills with 135° apex for sharper penetration and cleaner holes.
• Metric bottoming/coarse HSS taps sized to each insert for precise thread cutting.
• Stainless inserts re-form the internal thread to original dimensions.
• Break-off pin tools ensure the tang is removed without damaging the insert.

Which sizes and quantities are included, and what materials do they suit?

The set covers common metric fastener sizes from M5 to M12 with multiple replacement inserts per size so you can handle several repairs. The 304 stainless inserts are compatible with a wide range of base materials and designed to withstand higher torque than a stripped softer metal thread.

• Thread inserts: 25 each of M5×0.8, M6×1.0, M8×1.25, M10×1.5; 10 each of M12×1.75.
• Tooling: five 4241 HSS drill bits, five 4241 HSS taps, five break pin tools.
• Works in metals, composites, plastics and other substrates commonly found in automotive and plumbing work.
• 304 stainless resists corrosion and lengthens thread life under repeated torque cycles.

What tools and features make on-the-job use easier?

Tools in the kit are preselected for the included insert sizes so you do not need to match separate components. The case keeps each drill, tap, insert and tool visible and secure; portable organization speeds up repair time and reduces the chance of lost parts.

• Blow-molded case with molded slots for neat, portable storage.
• Break pin tools sized for controlled tang removal after installation.
• HSS taps and drills optimized for efficient cutting and chip evacuation.
• Clear quantity mix supports multiple repairs without restocking immediately.

Who is this for? The BILITOOLS Helicoil Thread Repair Kit Metric is built for mechanics, maintenance technicians, DIY enthusiasts and plumbers who need a durable, repeatable method to restore stripped or damaged internal threads. It’s especially useful for automotive engine blocks, cylinder heads, transmission bell housings, plumbing fixtures and any application where replacing the parent part would be costly or impractical. If you work with metric fasteners and want a compact kit that includes both tooling and a broad range of stainless inserts, this set offers the components and storage needed to get jobs done on site.