... cage fixed as a whole; 4) The contact angle is 90 °, subject to pure axial load; 5) The double-row ... ball bearing product series: Single row thrust ball bearings series:Flat seat series: 511xx, 512xx, 513xx, 514xx, 29xx, 39xx. Spherical ... thrust ball bearings of series:Flat seat series: 522xx, 523xx, 524xx. Spherical seat series: 542xx, 543xx, 544xx. Spherical seat series: 542xxU, 543xxU, 544xxU. ...