How to choose four point contact ball bearings and single row rotary bearings correctly may be a challenge for many people, especially when there are strict technical, reliability or economic requirements. In these cases, our company can use state-of-the-art analytical methods to provide advanced calculations and simulations to optimize and validate the best design to meet customer needs. Our company has a variety of customized bearings that meet design standards and different diameters to meet the needs of special applications. This paper briefly analyses four point contact ball bearings and single row rotary bearings as well as their characteristics. I hope this article will be helpful to you.