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Double ball bearing Double ball bearing belongs to high-grade bearings, in the form of rolling friction, the two ball bearings, High speed Spindle blog bearing numerous tiny ball around the axis, when the fan page or axis rotates, the steel ball is followed by rotation. Because are spheres, so the friction is small, and there is no problem of leakage of oil. Double ball bearing has the advantage of long life, about 50000-100000 hours, good aging resistance, high speed bearing and suitable for the fan with high speed.The disadvantage of double ball bearing is that the manufacturing cost is high and the noise is the maximum at the same rotational speed.