Double Row Angular Contact Ball Bearings have an inner and outer ring with a double raceway. The two rows are so related that the contact angle is similar to a pair of back-to-back single row bearings. The 5200 and 5300 series offer continuous races and can carry thrust loads in either direction. Since the 3200 and 3300 series have filling slots, it is necessary to mount them with the thrust load acting against the unnotched face of the rings. NTN Angular Contact Ball Bearing, Round Bore, Series: 53 Series, 45 mm Bore, 100 mm OD, 2 Rows, 39.7 mm Width, 30 °Contact Angle, Double Shield Closure, High Carbon Chrome Steel Bearing, Nylon Cage, 4600 RPM Grease Maximum, -40 to 120 °C