Cast Iron Hanger Ball Bearing Units having set screw locking that one kind of pedestal bearing, which is also called hanger bearing, which is used to hang or support shaft in mid parts. Plummer block bearing also known as Pedestal Bearing or bearing housing, is a pedestal used to provide support for a rotating shaft with the help of compatible bearings & various accessories. Housing material for a pillow block is typically made of cast iron or cast steel.