Needle roller / angular contact ball bearings

Needle roller / angular contact ball bearings

SKF supplies needle roller / angular contact ball bearings without seals in two series:

  • NKIA 59 series (fig. 1) bearings can accommodate axial loads in one direction
  • NKIB 59 series (fig. 2) bearings can accommodate axial loads in both directions

These combined bearings:

  • consist of a radial needle roller bearing and an angular contact ball bearing
  • accommodate heavy radial loads, carried exclusively by the needle roller bearing
  • accommodate light axial loads, carried exclusively by the angular contact ball bearing
  • are low cross section bearings
  • can operate at high speeds
  • are separable, i.e. the inner ring can be mounted separately from the outer ring and rolling element and cage assemblies
  • can be grease or oil lubricated, depending on the application
    In the case of grease lubrication, both the needle roller and angular contact ball bearings should be filled with the same lubricant prior to mounting.
NKIA series bearings
  • can accommodate axial loads in one direction (fig. 1) and, therefore, locate the shaft in one direction only
  • can be mounted back-to-back (fig. 3), for short shafts and where changes in length due to thermal expansion are relatively minor
NKIB series bearings
  • can locate the shaft in both directions (fig. 2
  • have axial clearance, between 0,08 and 0,25 mm
  • have a two-piece inner ring to facilitate mounting
    When mounting the inner ring, it is important that the two pieces are axially clamped to one another.
  • have inner rings, which are not interchangeable with those from another seemingly identical bearing (keep together as supplied)
Relubrication features

The needle roller bearing used in combined bearings has an annular groove with one lubrication hole in the outer ring.

Cages

SKF needle roller / angular contact ball bearings are fitted with cages shown in table 1.

When used at high temperatures, some lubricants can have a detrimental effect on polyamide cages. For additional information about the suitability of cages, refer to Cages.

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