The raceways of the inner and outer rings of angular contact ball bearings can have relative displacement in the direction of the horizontal axis, so their design can withstand combined loads - that is, radial and axial loads acting simultaneously. The axial load carrying capacity of angular contact ball bearings increases with the increase of contact angle. The contact angle is defined as, in the radial plane, the line between the contact point of the steel ball and raceway and the bearing shaftBearing axis vertical line of the angle. The load is transmitted from one raceway to another along the line of contact between the balls and the raceways.Four-point contact ball bearing for a single-row angular contact ball bearing is a separable bearing, steel ball and the collar four points of contact, the contact angle of 35 °, can bear radial load and two directions of axial load or diameter, axial combined load.