Needle roller bearings are bearings with cylindrical rollers that are small in diameter relative to their length. The modified roller/raceway profile prevents stress peaks to extend bearing service life. Supplies needle roller bearings in many different designs, series and in a wide range of sizes, which makes them appropriate for a wide variety of operating conditions and applications. This is a long cylindrical roller radial roller bearing (needle bearing), without rings. Like all needle bearings, it is capable of taking only radial loads at fairly low speeds and requires very accurate alignment of the seats. However, it also has extremely useful features that make them irreplaceable in operation - first of all, they have the maximum radial load capacity with minimum dimensions. It is installed mainly in the checkpoint of trucks, primarily KamAZ. A distinctive feature of the 664000 series is that the rollers are arranged in two rows (see diagram).