88/131pc Thread Repair Kit M5–M12 Wire Insert Set for Engines

Restore Stripped Threads Like a Pro – M5 to M12 Thread Repair Kit

Whether you're working on an engine block, motorcycle, bicycle, or car interior, this comprehensive thread repair kit gives you everything needed to restore damaged or stripped threads quickly and reliably. The precision wire thread inserts create a new thread that is often stronger than the original, thanks to tight tolerances and hardened steel construction (HRC 60–63 degrees).

Available in two configurations — 88-piece (M6/M8/M10) and 131-piece (M5/M6/M8/M10/M12) — this kit is ideal for automotive mechanics, DIY enthusiasts, and professional workshops alike.

Made in Mainland China.

⚠️ Metal Care Note: These tools are made of metal. Applying a light coat of rust-preventive oil or grease after use helps form a protective barrier against moisture and corrosion, extending the lifespan of your kit.

Key Features

• ✅ Restores worn or stripped threads in metal — results often stronger than the original
• ✅ Suitable for engine blocks, throttle bodies, seat brackets, door locks, fenders, and more
• ✅ Works on cars, motorcycles, and bicycles
• ✅ Hardness: HRC 60–63 degrees for long-lasting durability
• ✅ Complete all-in-one kit: drill bits, taps, installation tools, break pin tools, thread inserts, and wrench included
• ✅ Choose from 88-piece or 131-piece set based on your needs

88-Piece Kit Specifications (M6 / M8 / M10)

• Thread Sizes: M6 × 1.0, M8 × 1.25, M10 × 1.5
• 3× Taps: M6×1.0×10.8mm, M8×1.25×10.8mm, M10×1.5×13.5mm
• 3× Drill Bits: 6.3 / 8.4 / 10.4mm
• 3× Break Pin Tools
• 75× Thread Inserts: M6×1.0 (25pc), M8×1.25 (25pc), M10×1.5 (25pc)
• 1× T-Wrench

131-Piece Kit Specifications (M5 / M6 / M8 / M10 / M12)

• Thread Sizes: M5 × 0.8, M6 × 1.0, M8 × 1.25, M10 × 1.5, M12 × 1.75
• 5× Twist Drill Bits
• 5× Taps
• 5× Installation Tools
• 5× Break Pin Tools
• 25× Wire Thread Inserts M5×0.8×6.7mm
• 25× Wire Thread Inserts M6×1.0×8.0mm
• 25× Wire Thread Inserts M8×1.25×10.8mm
• 25× Wire Thread Inserts M10×1.5×13.5mm
• 10× Wire Thread Inserts M12×1.75×16.3mm
• 1× Hex Key
• 1× Storage Case

How to Use – Step-by-Step

1. Drill out the damaged thread using the correctly sized drill bit (included)
2. Tap the re-drilled hole using the supplied tap
3. Load the coiled wire insert into the applicator tool
4. Screw the coil insert into the casting
5. Use the break pin tool to snap off the installation tang from the insert
6. Thread is fully restored and ready to use

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Learn more: FuelEconomy.gov on vehicle maintenance

Frequently Asked Questions

Q: What thread sizes does this thread repair kit cover?

A: The 88-piece kit covers M6, M8, and M10 thread sizes. The 131-piece kit extends coverage to M5, M6, M8, M10, and M12 — making it ideal for a wider range of automotive and mechanical applications.

Q: Can this thread repair kit be used on engine blocks and automotive parts?

A: Yes! This kit is specifically designed for engine and automotive applications, including engine blocks, throttle components, seat brackets, door locks, fenders, and more. It also works well on motorcycles and bicycles.

Q: Are the wire thread inserts stronger than the original threads?

A: Due to the narrow and precise tolerances of the wire thread inserts, the repaired thread is typically stronger than the original damaged thread, providing a long-lasting and reliable fix.

Q: Does the 131-piece kit come with a storage case?

A: Yes, the 131-piece kit includes a dedicated storage case to keep all components organized and protected between uses.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.