Genuine OEM Hyundai Drive Belt Tensioner, part number 252812F000. This critical engine component is responsible for maintaining the correct tension on the serpentine drive belt, which powers various accessories such as the alternator, power steering pump, and air conditioning compressor. It ensures consistent belt grip, preventing slippage, excessive wear, and noise. Weighing approximately 0.78 kg, this tensioner assembly includes a pulley and a spring-loaded mechanism. Choosing a genuine OEM belt tensioner guarantees precise spring calibration, durable bearing quality in the pulley, and correct mounting for optimal belt alignment and long-term reliability of the accessory drive system.