CXPRO Thread Repair Kit 314-Pc Metric & SAE Helicoil Set — M5–M12 & 1/4"–1/2", Hardened Tools & Case

The CXPRO 314-piece Thread Repair Kit supplies metric and SAE helicoil inserts plus the specialized tools needed to restore stripped internal threads quickly and reliably.

If a cylinder head, engine block, or instrument panel screw hole has rounded or damaged threads, this kit gives you the parts and tools to rebuild the thread to a like-new size. The set blends both metric and inch (SAE) helicoils, hardened installation tools, a selection of drill bits, a tang break-off tool, storage case, and gloves so you can work cleanly and confidently in the garage or on the job site.

What thread sizes are covered and why does that matter?

The CXPRO kit covers common workshop sizes in both metric and SAE standards, so you won’t need separate kits for mixed fleets or household projects. Having the right insert size ensures the repaired hole accepts standard fasteners and retains full clamp strength without oversize drilling.

• Metric inserts: M5, M6, M8, M10, M12
• SAE inserts: 1/4", 5/16", 3/8", 7/16", 1/2"
• Wide size range reduces trips to the hardware store

How do the tools included make installation simpler?

Tools in the kit are selected to match the helicoil installation process: a tapered installation mandrel, installation tool, matching drill bits, and a tang break-off tool. A 135° drill bit angle is provided for clean, centered pilot holes, and the break-off tool ensures the helicoil tang separates cleanly after seating.

• Pre-matched drill bits for correct hole preparation
• Installation mandrels sized to fit each helicoil diameter
• Tang break-off tool for flush finishing without damage
• Included gloves help keep threads and inserts free from oil and debris

Are the inserts and tools durable enough for repeated repairs?

All metal components are made from heat-treated steel chosen for wear resistance and corrosion protection, so they withstand the torque and repeated service expected in automotive and industrial repairs. Using robust inserts and hardened tools keeps repaired threads secure for long-term use.

• Hardened steel helicoils resist deformation under load
• Tools heat-treated to resist wear during repeated installations
• Corrosion-resistant finishes extend working life in workshop environments

How is the kit organized for practical use?

The kit nests every component in a fitted carrying case so you can identify sizes at a glance and transport the set without losing small parts. Organized compartments speed up job setup and protect fragile drill bits and installation tools from damage between uses.

• Compact, labeled compartments for each helicoil size
• Secure storage for drill bits, mandrels, and the break-off tool
• Includes gloves to keep parts clean during installation

Who is this for: The CXPRO 314-piece Helicoil Thread Repair Kit is designed for mechanics, fleet maintenance teams, DIY automotive enthusiasts, and general repair technicians who regularly encounter damaged threaded holes in engines, machinery, or equipment. It’s also useful for hobbyists who work on bikes, ATVs, lawn equipment, or home projects that require restoring fastener threads without replacing the entire part.