Genuine OEM Volkswagen hexalobular flange bolt, part number N91180401. This fastener is designed for the secure mounting of sensors and electronic modules within the engine bay. The integrated flange design provides a larger bearing surface to distribute clamping force evenly across the component housing. Genuine OEM fasteners are critical for these applications to ensure the correct torque-to-yield characteristics and to prevent damage to sensitive plastic or aluminum housings during installation.