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Angular contact ball bearing are composed of inner and outer ring, steel balls and cage. For angular contact ball bearing, in general, the contact angle is 15°，25°，30°and 40°, the suffixion are C, AC (NSK bearing is A5), A and B. The axial load carrying capacity of angular contact ball bearings increases with increasing contact angle. Angular contact ball bearings use the brass, steel or nylon cage. Angular contact ball bearing is including the single row angular contact ball bearing, double row angular contact ball bearing and four-point angular contct ball bearing. Following is the type: 1, Single row angular contact ball bearing: 70 series, 72 series, 73 series, 74 series, 78 series and 79 series. 2, Mini angular contact ball bearing: 70X 3, Double row angular contact ball bearing: 52 series, 53 series, 32 series, 33 series, LD57 series, LD58 series. 4, Four-point angular contact ball bearing: QJ2 series, QJ3 series.