The torsion bar key nut for the A-axis of the Citroën 11CV/15CV is an essential component for adjusting and maintaining the suspension. This part allows for the adjustment of tension and vehicle height, crucial for optimal driving experience and stability. Made from high-quality steel, this nut is designed to reliably withstand road forces. Regular maintenance and inspection of this key nut are recommended to limit wear and ensure the longevity of the suspension. Suitable for classic Citroën 11CV and 15CV models.