The chassis nut M7 square for the Citroën 2CV is a specific fastening element used in the assembly of parts to the chassis of this classic car. It is a square-shaped nut with an M7 thread size, meaning it is suitable for use with bolts or screws with a 7-millimeter diameter. These nuts are essential for maintaining the structural integrity of the 2CV and are often used in restoration projects to return the car to its original state.