The upper ball joint lock nut for the Citroen 11CV is a crucial component of the car's suspension structure. It ensures smooth steering movements and enhances stability by firmly holding the ball joints in place. This nut prevents unintended loosening of the ball joints during driving, contributing to overall safety. Specifically designed to fit the timeless design of the Citroen 11CV, it offers necessary robustness and durability. Vital for an optimal suspension system function, this lock nut ensures that steering precision and driving comfort are maintained.