Genuine OEM Volkswagen Hexagon Head Bolt, part number N10027004. This bolt is designed to secure components within the toothed belt or toothed belt guard assembly, as indicated by its position 5 on the diagram. It has a length of 0.097 meters, a width of 0.015 meters, and a height of 0.015 meters. Genuine OEM bolts are crucial for maintaining the precise timing and tension of the toothed belt system, preventing catastrophic engine failure.