XunLiu Key Locking Inserts Thread Repair (M4X0.7-M8X1.25-8L)

Key features

• PROFESSIONAL THREAD REPAIR — Designed to restore damaged or stripped internal threads to full original strength. Eliminates costly part replacement and rework, saving time and material costs in industrial and manufacturing environments.
• 4-KEY LOCKING MECHANISM FOR VIBRATION RESISTANCE — Four external locking keys are permanently pressed into the parent material, providing a 360° mechanical lock that prevents rotation, loosening, or pull-out even under high torque and heavy vibration loads.
• PREMIUM 303 STAINLESS STEEL CONSTRUCTION — Manufactured from corrosion-resistant 303 stainless steel, offering excellent performance in harsh environments including moisture, chemicals, and elevated temperatures. Built for long-lasting reliability.
• REINFORCES LOW-STRENGTH BASE MATERIALS — Ideal for aluminum alloy, cast iron, engineering plastics, and other soft or brittle materials. Dramatically increases the load-bearing capacity of threaded holes, extending service life of assemblies.
• REMOVABLE WITHOUT DAMAGING PARENT MATERIAL — The key insert can be removed and replaced without compromising the base material, making it perfect for repair, maintenance, and prototype applications where flexibility is essential.

The XunLiu Key Locking Insert is a precision-engineered threaded fastener featuring both internal and external threads, with four locking keys on the outer surface. It is designed to provide a permanent, torque-resistant, and vibration-proof thread connection in demanding industrial applications. How It Works: Once the parent material is tapped to the required size, the insert is threaded into the hole, and the four locking keys are driven into the base material using a key-driving tool. This creates a solid mechanical lock that prevents the insert from rotating or being pulled out under load. Ideal Applications: Thread repair in aluminum, cast iron, plastics, and other low-strength materials; aerospace, automotive, electronics, and precision machinery manufacturing; repair and maintenance scenarios requiring thread restoration without full part replacement. The insert is fully removable without damaging the parent material, offering unmatched flexibility for engineering and repair teams.

Free shipping included. 30-day hassle-free returns.