The pillow block Bearings are essentially a variant of deep groove ball bearings; they are characterized by a spherical outer diameter surface on the outer ring, allowing them to fit into a corresponding concave spherical seat within the bearing housing to provide self-aligning capability. These bearings are primarily designed to accommodate combined radial and axial loads—with radial loads predominating—and are generally unsuitable for bearing axial loads in isolation. They come pre-lubricated with an appropriate amount of lubricant, requiring neither cleaning nor re-lubrication prior to installation. When securing the bearing to the shaft via the set screw located on the extended inner ring, the applied axial load must not exceed 20% of the rated dynamic load. Insert bearings with eccentric locking collars function similarly to those with set screws, the key difference being that the locking screw is located on the eccentric collar rather than the inner ring. Bearings with a tapered bore feature a 1:12 taper, allowing for direct mounting onto a tapered shaft or installation onto a plain shaft (without a shoulder) using an adapter sleeve, while also permitting fine adjustment of the internal clearance.Pillow Block Bearings can be classified into three types based on their locking method: UC (set screw), UEL (eccentric sleeve), and UK (adapter sleeve). Commonly matched cast bearing seats include vertical seat (P), narrow vertical seat (PA), high center vertical seat (PH), square seat (F), convex square seat (FS), convex circular seat (FC), diamond seat (FL), annular seat (C), slider seat (T), suspension seat (HA), adjustable diamond seat (FA), and suspension bearing seat (FB);