... , or Axle Bearing. They are used in the bottom of the underpan. Usually be used in the automobile, machinery, trains, and so ... on.Differential Oil Seals, also called Axle Bearing, which is in the bottom of the Underpan. It's used to close ... side gear wheel or the gear unit. They are used in automobile, electrical appliance, mechanical, industrial, trains, motorcycles, trucks, buses, and ...