Angular contact ball bearings ball inside and outside the ring and the connection point of contact with the radial at an angle. Contact angle is generally divided into 15 ° , 30 ° , 40 ° , respectively, with the letters C, A, B said, NSK special production for the 25 ° Contact angle of such bearings, using A5 said. Angular contact ball bearing is mainly exposed to large axial load, the greater the contact angle, the greater ability to withstand load. Cage material steel, brass or engineering plastics, stamping or forming methods are turning, depending on the form or the bearing different selection conditions of use. There are other combination of angular contact ball bearings, double row angular contact ball bearings and four-point contact ball bearings.