Single row four-point angular contact ball bearings are single row angular contact bearings The raceways of these bearings are designed to accept axial load in both directions.
In the axial direction arrangement, single row four-point angular contact ball bearings require less space than double row angular contact ball bearings. The contact angle is 35°. The two-part inner ring allows the bearing to be filled with more balls, which creates a design with higher load rating. Whereas these bearings are separable, the outer ring with a filled cage can be mounted in the arrangement separately.
Single row four-point angular contact ball bearings are designed to carry mainly axial loads and their clearance in the housing is similar to the clearance of axial bearings. Bearings with outer diameter higher than 160 mm are made with two snap ring grooves in the outer ring (type N2) to enable simple fixing, which stops the outer ring from twisting. For the groove dimensions see the following table.
Single row angular contact ball bearings are commonly produced in tolerance classes P0 and P6 according to the standard ISO 495. Production of bearings with higher tolerance class (P5 or P4) should be discussed in advance.
Cage
Single row four-point angular contact ball bearings are mainly equipped with a massive brass cage. They can also be equipped with a glass fiber reinforced polyamide cage.
Dimensions
The dimensions of single row four-point angular contact ball bearings are in the table part and they are in accordance with the international standards ISO 15.
Misalignment
Single row four-point angular contact ball bearings can accommodate the misalignment of the rings by aligning the outer ring towards the inner ring at a limited degree. Factors influencing the alignment of these bearings are the same as in the case of single row deep groove ball bearings. Any misalignment produces increased vibration level whilst the bearing is in operation. If the single row four-point angular contact ball bearings are combined in the arrangement with other radial bearings so they shall operate as axial bearings, there must be a radial clearance in the body. This way, the external ring may align modifications caused by thermal expansiveness.
