Angle contact ball bearings ball and ring contact point connection within and outside perspective with the radial. Contact angle is generally divided into 15 °, 30 °, 40 °, respectively by the letters c, a, b, NSK special production is 25 ° contact angle of the bearings, A5. Angular contact ball bearings under unidirectional axial load, larger the contact angle, afford larger the load carrying capacity. Cage materials include steel, brass or engineering plastic, molding method on stamping or turning, depending on the bearing type or usage conditions of selection. Other combinations of angular contact ball bearings, double row angular contact ball bearings and four-point contact ball bearings.