Genuine OEM Audi Crankshaft Wheel Bolt, part number 078105229D. This critical fastener is designed to securely attach the crankshaft wheel (harmonic balancer or vibration damper) to the crankshaft. It is located at the front of the engine, playing a vital role in engine balance and power transmission. Made from high-strength steel, this bolt is engineered to withstand extreme rotational forces and vibrations. Using a genuine OEM crankshaft bolt ensures the correct material properties, thread pitch, and torque specifications, preventing catastrophic engine damage from component separation.