Genuine OEM Jaguar Cylinder Head Bolt, part number AJ812892. This essential fastener is designed to secure the cylinder head firmly to the engine block. Its primary function is to provide the precise clamping force required to maintain the integrity of the cylinder head gasket and prevent combustion gas or fluid leaks. These bolts are installed within the engine, connecting the cylinder head to the block. Constructed from high-strength steel, it is engineered to withstand extreme engine temperatures and pressures. Using genuine OEM cylinder head bolts ensures the correct material properties, thread pitch, and torque specifications for reliable engine assembly and long-term performance.