Four-Point Contact Ball Bearings: Structure, Applications, and Purchasing Guide
Four-point contact ball bearings handle axial loads in both directions within a single unit — a capability that sets them apart from angular contact ball bearings, which require paired installation to achieve the same result. This article covers how they work, where they are used, and what to verify at the procurement stage: load direction, operating speed, model prefix identification (QJ series), and installation configuration.