69 series of thin-walled bearing the most representative of the rolling bearing, wide range of uses. suitable for high speed high speed runs, but very durable, do not need regular maintenance. this kind of bearing friction coefficient, high speed, simple structure, low cost, easy to reach high manufacturing precision. Various sizes and forms, used in precision instruments, low-noise motor, automobile, motorcycle and General machinery industry, is the most widely used type of bearings in machinery industry. mainly bear the radial load, and can withstand a certain amount of axial load.