NK series

Solid ferrule needle roller bearing is composed of the machined outer ring, inner ring, cage, and needle roller, with small section height, large load capacity and rigidity, compact structure, and small volume. This type of bearing can be provided with two series of products, metric and imperial. Each series has three structures: cage, full needle type, and sealed type. In addition, the solid ferrule needle roller bearing can be divided into two structures with and without the inner ring. The structure with the inner ring can obtain higher rotation accuracy. The structure without the inner ring takes the shaft as the raceway surface, making the volume smaller.
The needle roller bearing is equipped with thin and long rollers (roller diameter D≤5mm， L/D≥2.5, L is the roller length), Therefore, the radial structure is compact. When its inner diameter size and load capacity are the same as other types of bearings, the outer diameter is the smallest, which is especially suitable for bearing results with limited radial installation size. Bearing without an inner ring or needle roller and cage assembly can be selected according to different applications. At this time, the journal surface and shell hole surface matched with the bearing are directly used as the inner and outer rolling surfaces of the bearing. In order to ensure the same load capacity and operating performance as the bearing with the ring, the hardness, machining accuracy, and surface quality of the raceway surface of the shaft or outer shell hole should be similar to the raceway of the bearing ring. This bearing can only bear radial load.