Full definition
Self-contained bearing unit consisting of a cast-iron or pressed-steel housing with an integrated insert bearing (typically spherical OD for self-alignment). Allows easy mounting of rotating shafts on flat surfaces or structural frames. Main types: pedestal/pillow block (UCP series), square flange (UCF), two-bolt flange (UCFL), three-bolt flange (UCFB), take-up (UCT), cartridge (UCC). Bore sizes: 12-120 mm standard. Seals: contact rubber or labyrinth. Lubrication: grease via zerk fitting, relubrication interval per speed and load. Per ISO 3228. Leading brands: SKF, NTN, NSK, Timken, Dodge (ABB). Critical for conveyors, fans, agricultural equipment, and general power transmission.