タイトルまたは説明

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, when the ratio of the diameter and the length of roller of a roller bearing are between the intervals 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.