Genuine OEM Hyundai Cylinder Head Screw, part number 221262M800. This essential bolt is specifically designed to fasten the cylinder head securely to the engine block, creating a tight seal for combustion and coolant passages. It is located within the cylinder head assembly. Using genuine OEM cylinder head screws ensures the correct material composition, tensile strength, and precise torque yield, which are paramount for maintaining engine compression and preventing leaks under extreme operating conditions.