Genuine OEM Volkswagen Socket Head Bolt, part number N91193101. This bolt is designed to secure various brackets and components within the vehicle heating and air conditioning assembly. It ensures that critical climate control parts remain properly aligned and vibration-free during operation. The bolt features a specific 40mm length and a specialized head design for tight-clearance installations. Using genuine OEM fasteners prevents issues like thread stripping or loosening caused by thermal expansion in the engine bay.