Genuine OEM Volkswagen Socket Head Bolt, part number N10226004. This bolt is used to secure components within the engine cooling system. It is located at position 2 in the diagram. The bolt has a length of 0.035 meters, a width of 0.016 meters, and a height of 0.016 meters. Genuine OEM bolts are manufactured to exact specifications, ensuring proper torque and clamping force for reliable engine cooling system operation.