... years professional manufacture China bearing WQK angular contact ball bearing 3303ATN9 1.popular WQK angular contact ball bearing 2.advanced German technology3 ... structure: 7000C, 7000AC, 7000A, 7000B, dB, DF, QJ, QJF. 5.application: (1) Single row angular contact ball bearing is ... , differential pinions axis; (2) Double row angular contact ball bearing widely used in oil pump, roots blower, air ...