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15-Pc Metric Thread Repair Kit M5–M14 | Helicoil Insert Tool Set
15-Pc Metric Thread Repair Kit M5–M14 | Helicoil Insert Tool Set
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Restore Stripped Threads Like a Pro
Don't let a damaged or stripped bolt hole slow you down. This 15-piece metric thread repair insert kit gives you everything you need to fix stripped threads in soft metals quickly and permanently. Covering 11 thread sizes from M5 to M14, it's the go-to solution for automotive mechanics, DIY enthusiasts, and professional workshops alike.
Made in Mainland China from premium-grade steel, this kit delivers lasting reliability for demanding repair jobs.
What's in the Kit?
- Wire Thread Inserts (Helicoil-style) — create a stronger, wear-resistant internal thread
- Insert Installation Tools — for precise, hassle-free fitment
- Twist Drill Bits — sized perfectly for each thread repair
- Thread Taps — cut clean new threads ready for the inserts
- Lug Breaking Tools — snap off the installation tang cleanly after fitting
Full Thread Size Compatibility
- M5 × 0.8
- M6 × 1.0
- M8 × 1.25
- M10 × 1.0 / 1.25 / 1.5
- M12 × 1.25 / 1.5 / 1.75
- M14 × 1.25 / 1.5
Key Features
- ✅ Complete all-in-one kit — no extra tools needed
- ✅ Premium steel construction — built for long-term durability
- ✅ Strengthens repaired threads — often stronger than the original
- ✅ Protects against future wear — ideal for aluminium, cast iron & soft metals
- ✅ Compact storage case — portable and neatly organised
- ✅ 11 thread size options — covers the most common metric fastener sizes
Specifications
| Material | Steel |
| Color | Silver |
| Thread Quantity (per size) | 10 inserts |
| Sizes Available | 11 options: M5×0.8 to M14×1.5 |
| Package Size | 18 × 12 × 3 cm (7.09 × 4.72 × 1.18 in) |
| Package Weight | 440 g (15.52 oz) |
| Country of Origin | Made in Mainland China |
Package Contents
1 × Metric Thread Repair Insert Kit (as shown)
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For guidance on safe tool use and workshop safety standards, visit the OSHA Hand & Power Tools Safety page.
Frequently Asked Questions
Q: What metals is this metric thread repair kit suitable for?
A: This thread repair insert kit is ideal for use in soft metals including aluminium, cast iron, magnesium alloy, and other materials commonly found in automotive engines and machinery. The steel wire inserts create a stronger thread than the original material.
Q: Can I use this kit for automotive thread repair, such as spark plug holes or engine block threads?
A: Yes! This helicoil-style thread repair kit is widely used for automotive applications including spark plug threads, cylinder head bolts, and engine block repairs. It's compatible with M10 and M12 threads most commonly found in engines.
Q: Does this kit include everything I need to complete a thread repair?
A: Absolutely. The kit includes wire thread inserts, installation tools, twist drill bits, thread taps, and lug breaking tools — everything required to complete a full thread repair from start to finish without needing additional equipment.
Q: How do I choose the right thread size from this kit?
A: Match the size marking (e.g. M10 × 1.5) to the bolt or fastener that originally fitted the damaged hole. If unsure, use a thread pitch gauge to measure the original thread before selecting your insert size. This kit covers 11 of the most common metric thread sizes.
