Genuine OEM Hyundai exhaust system lock nut, part number 1319806000B. This lock nut is used to secure various components of the exhaust system, ensuring a tight and vibration-resistant connection. It is manufactured with the correct thread specifications and material properties to withstand the high temperatures and stresses of the exhaust environment. Using genuine OEM parts is vital for maintaining the integrity and safety of the exhaust system, preventing leaks and ensuring proper function.