Mounted Bearing Units are used when the shaft axis is perpendicular or parallel to the bearing mounting surface. They incorporate a sealed bearing that is preassembled into a flanged housing. The housing is available in cast iron, pressed steel, stainless steel and thermoplastic. It contains a precision ground surface perpendicular or parallel to the bearing axis and two, three or four mounting holes, depending on the style. The bearing can be unbolted and removed, which makes bearing replacement easier and faster than traditional rotary bearings that must be press fit into a housing. Flange mounted bearings can also support heavy loads, which protects the shaft from deflection, which could cause vibration or other damage.