TNA bearings are similar to the TDO, but the inner race narrow faces are extended to abut and eliminate the need for a separate inner race spacer.  Supplied with an in-built clearance to give a standard setting range, these bearings provide a solution for many fixed or floating bearing applications where simplicity of assembly is required.

Size range:

ID 25.400 mm to 1200.150 mm (1.0000 in. to 47.2500 in.) OD 30.480 mm to 2460.000 mm (1.2000 in. to 96.8504 in.)

Design Attributes:

  • Double cup and two single cones.
  • Internal bearing clearance controlled by extending the front faces of the cones so they contact each other.
  • SW variation features chamfers in the bores at the front faces of the two single cones to form a lubrication groove.
  • SE variation features a backface rib design to accommodate radial lip seals or stamped closure.


  • Sheaves
  • Crane sheaves
  • Oil-field drilling rig sheaves
  • Applications where two-row preset bearings are required