A-type double row angular contact ball bearings are the newest type in this family. Their internal design dimensions have been optimized. They have a 32 degree contact angle and do not have a ball groove. Another type of double row balls has a ball groove on one side, but they have gradually been replaced by type A. Ball groove bearings must be mounted in such a way that the main axial load is on the side without the groove. The seal types are filled with a lithium-based grease that has good anti-rust properties and can operate in a temperature range of -30 to +110 degrees Celsius