Genuine OEM Hyundai Knock Sensor Flanged Bolt, part number 1140308306K. This specialized bolt is designed to securely fasten the knock sensor, which detects engine knocking or pre-ignition. It is installed in the engine assembly, typically near the cylinder block. The bolt measures approximately 0.25 meters in length and has a flanged head for secure mounting. Using a genuine OEM bolt ensures the correct thread pitch, material strength, and precise fit to prevent sensor loosening and maintain accurate engine diagnostics.