Needle Roller Bearing

A needle roller bearing is a bearing which uses small cylindrical rollers. The difference between a needle roller bearing and roller bearing is the ratio of diameter and length of their rollers, as a general rule when the ratio of the diameter and the length of roller of a roller bearing is between the interval of 0.1 to 0.4, that roller bearing is called a needle roller bearing. They are used to reduce the friction of a rotating surface and are extremely suitable for bearing arrangements where radial space is limited.