Needle roller bearings are equipped with slender rollers (roller length is 3 ~ 10 times the diameter, diameter is generally not more than 5mm), so the radial structure is compact, its inner diameter size and bearing capacity and other types of the same bearing, the outside diameter is the smallest, especially suitable for the radial installation size of the limited support structure. Needle roller bearing according to the use of different occasions, machining accuracy and surface quality should be combined with bearing ring, use. Needle roller bearing is a bearing unit composed of radial needle roller bearing and thrust bearing components.
