Chrome steel needle roller bearing NK series

 Needle roller bearing, needle bearing is the roller bearings with cylindrical roller, relative to its diameter, roller is thin and long.This is called needle roller.Although has a small cross-section, bearing still has high load capacity, needle bearing with fine and long roller  for the roller length, so the radial structure is compact, its diameter and load capacity at the same time, with other types of bearing outside diameter to a minimum, especially suitable for the limited size of the radial installation supporting structure.Needle bearings use a roller style rolling element to reduce friction of a rotating surface.  They are available with or without an inner ring. The needle rollers are guided parallel to the axis using a cage retainer, thrust bearings can also be supplied with no retainer, which is referred to as a full complement of rollers.Needle bearings are heavily used in engine components such as rocker arm pivots, pumps, compressors, and transmissions.