In 2026, the global automotive parts industry has implemented stricter dimensional tolerance and safety testing standards for wheel hub accessories. International ISO automotive quality systems and EU accessory certification regulations have raised requirements for the machining accuracy, surface hardness, and fatigue resistance of wheel nuts, studs, and adapters. Advanced CNC integrated processing technology is widely adopted in production, eliminating installation deviations, preventing wheel loosening during high-speed driving and under extreme road conditions, and greatly improving the overall safety and durability of vehicle wheel assembly systems.