Anti-Theft and Anti-Misoperation: Dedicated Tool Compatibility
The bolt head features a star-shaped protrusion (6-12 lobes) that requires a specialized external star socket/wrench for operation—standard tools cannot remove it. With a protrusion tooth pattern precision of ±0.03mm, the slipping rate exceeds 90% when mismatched tools are used, effectively preventing unauthorized maintenance (e.g., automotive anti-theft screws, bank equipment fasteners) and enhancing security by over 300%.
High-Wear Resistance and Heavy-Duty Performance
The star-shaped teeth on the head undergo integral quenching, achieving a surface hardness of HRC60-63—50% more wear-resistant than ordinary hex bolts. It can withstand up to 80N·m of torque (e.g., T50 specification), compatible with pneumatic wrenches for heavy machinery (e.g., construction vehicle tires, mining equipment). In long-term vibration environments, the loosening rate is less than 2%, far superior to traditional bolts.
Operational Convenience and Safety Redundancy
High-end sockets feature a built-in elastic locking ball that automatically secures onto the bolt after insertion, preventing detachment during vertical operations. The handle is equipped with a torque scale ring for manual presetting of force values (e.g., 50N·m) to avoid overloading. A specially designed fracture torque point (a weakened groove at the head-shank junction) intentionally breaks when torque exceeds limits, preventing equipment damage and providing dual-layer safety protection.

With core advantages of "professional protection, high reliability, and environmental resistance," the external star structure has become a standard fastener in high-end equipment and security-sensitive fields, effectively balancing fastening performance with anti-disassembly requirements.