Premium Stainless Steel Bolt Fastener Thread Repair Insert – M4 Key Locking

High-Grade Stainless Steel Construction
Crafted from corrosion-resistant 304 stainless steel for extreme durability, ensuring long-term performance in harsh environments. Precision-machined threads guarantee seamless compatibility with M4 bolts.
Key-Locking Technology for Unmatched Security
Patented key-locking mechanism prevents loosening under vibration, ideal for high-stress applications in automotive and industrial settings. Eliminates the need for thread adhesives or repeated maintenance.
Universal Thread Repair Solution
Restores damaged threads effortlessly, saving time and costs on replacements. Perfect for aluminum or soft-metal threads in engines, chassis, and machinery.
Optimized for New Energy Vehicles
Engineered to withstand high torque and thermal cycles in electric and hybrid vehicles, ensuring reliability in modern automotive systems.
Bulk Wholesale Advantage
Direct factory pricing with no minimum order quantity (MOQ) restrictions. Global logistics support for fast, large-volume deliveries.
Trusted Industrial-Grade Fastening
ISO-compliant manufacturing with rigorous quality control. Trusted by mechanics, manufacturers, and DIY professionals worldwide.