Genuine OEM Volkswagen Connecting Rod Bolt, part number 021105425B. This high-strength bolt is used to fasten the connecting rod to the crankshaft, playing a crucial role in the engine's internal rotating assembly. It must withstand significant tensile and shear forces during engine operation. Manufactured from specialized, high-tensile steel alloys to ensure maximum strength and fatigue resistance. Genuine OEM connecting rod bolts are engineered to precise specifications for correct clamping force and reliability, which is essential for preventing catastrophic engine failure.