Precision Ball Bearings. Precision Bearings are designed to meet demanding needs of special applications including high accuracy, high rotational speed and high rigidity. Optimal materials and internal design, give super precision bearings the highest level of accuracy.

A precision ball bearing is anything that has a higher standard precision level (i.e. ... The farther down in the table, the higher the precision of the bearing.The purpose of a precision  ball bearing is to reduce friction and support radial and axial loads. This is achieved by using at least two races to retain the balls and transmit the loads through the balls. Usually one of the races is held fixed. As one of the bearing races rotates it causes the balls to rotate; and because the balls are rolling they have a much lower coefficient of friction than if two flat surfaces were rotating against each other.