51111 Thrust Bearing 55x78x16mm51111 Thrust Ball Bearing 55mm x 78mm x 16mm One Bearing 51111 Thrust Ball bearing, a standard bearing size with dimensions commonly used across many industries: 55mm x 78mm x 16mm. Thrust bearing is known to high axial or Vertical loads. Made from durable 52100 alloy steel, commonly known as chrome steel. 51111 Ball Bearing Thrust Ball Bearing Dimensions: 55mm x 78mm x 16mm Metric ID (inner diameter) Bore: 55mm OD (outer diameter): 78mm Width: 16mm