Stainless Steel Thread Repair Insert Set M3–M12 | 60–300 Pcs

Restore Stripped Threads Fast with Premium Stainless Steel Wire Thread Inserts

Keep every threaded connection tight and long-lasting with this comprehensive Stainless Steel Wire Thread Repair Insert Set. Whether you're working on automotive components, machinery, electronics housings, or general metalwork, these precision-wound coil inserts rebuild damaged or worn threads to their original — or even stronger — specification. The set covers a wide range of thread sizes from M3 to M12, making it an indispensable addition to any workshop or toolbox.

Made in Mainland China.

Why Choose These Thread Repair Inserts?

• Premium Stainless Steel Construction: High-grade stainless steel wire provides outstanding corrosion resistance, durability, and long service life in demanding environments.
• Wide Size Range (M3–M12): One kit covers a broad spectrum of metric thread sizes, eliminating the need for multiple separate purchases.
• 60 to 300 Pieces Per Set: Generous quantity options mean you'll always have the right insert on hand for the job.
• Precision Thread Profile: Each insert is manufactured to exact metric thread standards, ensuring smooth engagement and a secure, vibration-resistant fit after installation.
• Versatile Application: Suitable for use in aluminum, cast iron, magnesium, plastics, and other materials where threads need reinforcement or restoration.
• Organized Storage Box Included: Inserts are sorted and stored in a clearly labeled compartment box for easy access and clutter-free storage on your workbench.

Key Specifications

• Material: Stainless Steel
• Thread Sizes: M3, M4, M5, M6, M8, M10, M12
• Quantity: 60–300 pieces (set dependent)
• Type: Wire Thread Repair Inserts / Screw Sleeves / Thread Protective Sleeves
• Storage: Organized compartment box included

Ideal For

• Automotive and motorcycle repair
• Machine and equipment maintenance
• Woodworking and furniture assembly
• Electronics and appliance repair
• DIY home improvement projects

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Frequently Asked Questions

Q: What thread sizes are included in the stainless steel thread repair insert set?

A: The set covers metric thread sizes from M3 through M12, including M3, M4, M5, M6, M8, M10, and M12. This wide range makes it suitable for most common metric threaded fastener applications in automotive, machinery, and DIY projects.

Q: What materials can these thread repair inserts be used in?

A: These stainless steel wire thread inserts are compatible with a wide variety of base materials, including aluminum, cast iron, magnesium alloys, hard plastics, and other metals. They are especially useful for restoring stripped threads in softer materials that are prone to wear.

Q: How do I install the thread repair inserts?

A: Installation requires a thread repair installation tool (tang break-off tool or installation mandrel, sold separately). First, drill out the damaged hole to the correct tap size, re-tap with the appropriate thread repair tap, then wind in the insert using the installation tool until it sits just below the surface. The tang is then broken off flush to complete the installation.

Q: Are the inserts corrosion-resistant?

A: Yes. These inserts are crafted from high-grade stainless steel, which provides excellent resistance to rust, corrosion, and high-temperature environments, making them ideal for both indoor and outdoor applications.

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.