Pillow block bearings are used, for instance, in agricultural machinery, conveying equipment, and construction machinery. A Pillow bearing unit consists of a deep groove ball bearing sealed on both sides and a spherical outside diameter together with a housing, which is either a casting or a sheet metal stamping. This units are supplied as plummer block or flanged housing mountings pillow block bearings covers the current units for metric and inch size shaft. Apart from very rare exceptions these bearing units are used as locating bearings. They are particularly suited for short shaft and for applications where only minor thermal expansions occur. Small shaft expansions are absorbed by the axial clearance in the bearings. Plummer block unit housing made of cast iron, flanged-housing unit made of sheet metal