Genuine OEM Volkswagen Hexagon Bolt, part number WHT011309. This hexagon bolt is a standard fastener used to join or secure components within the engine assembly, specifically related to the toothed belt system. It is located at position 3 in the diagram. The bolt is made of high-strength steel to ensure secure mounting of timing components. Genuine OEM bolts provide the correct specifications for reliable operation of the engine's timing system.