The hardness of the retainer is lower than that of the ball and ring, its material has a metal (such as: carbon steel, aluminum alloy) or non metal (such as: Tiefron, PTEF, polymer materials). Rolling bearings (bearing rolling) than the journal bearing (bearing journal) the rotation of the friction resistance is small, so the same speed, the friction generated by the temperature will be relatively low.

Ball bearings are generally used in low load mechanical transmission equipment. Because the ball bearing of small bearing area, under the high-speed operation easily appear serious mechanical damage, so in the heavy load of the mechanical transmission often take needle roller bearing in order to increase the bearing surface and improve the mechanical transmission efficiency, while reducing mechanical damage.

Ball bearings to change the friction of the bearing, the rolling friction, which is more effective in reducing the friction between the bearing surface, enhance the service life of the fan bearings, and thus the service life of the radiator. The disadvantage is that the process is more complex, the cost of upgrading, but also bring a higher noise.