Bearing data

Needle roller / angular contact ball bearings
Dimension standardsBoundary dimensions: ISO 15:2011 – dimension series 59, except for following inner ring parameters in the NKIB 59 series:
  • extended width on one side
  • slightly larger bore diameter of the narrow part
Tolerances
For additional information (→ Tolerances)
Normal, except for width of the complete inner ring in the NKIB 59 series: 0/–0,3 mm
Values: ISO 492:2014 (table 1)
Internal clearanceNormal (bearings with an inner ring)
Check availability of C2, C3 or C4 clearance classes

Values: ISO 5753-1:2009 (table 2)
Values are valid for unmounted bearings under zero measuring load.
Misalignment

Contact the SKF application engineering service.

The permissible angular misalignment between the shaft and the housing depends on the size and internal design of the bearing, the radial internal clearance in operation and the forces and moments acting on the bearing. Any misalignment increases bearing noise and reduces bearing service life.

Needle roller / thrust ball bearings
Dimension standardsBoundary dimensions: DIN 5429-1:2005, except for the bearings in the NX and NX .. Z series that are not standardized.
Tolerances
For additional information (→ Tolerances)
  • D: Normal
  • Fw: F6 (table 3)
  • d: E8 (table 3)
  • C: 0/–0,25 mm
  • C1 (applicable to NKX series only):
    0/–0,2 mm

Values:
  • Radial bearings → ISO 492:2014 (table 1)
  • Thrust bearings → ISO 199:2014 (table 4)
Operating clearance

Bearings without an inner ring

Range slightly less than Normal if recommended tolerances (table 5) applied
MisalignmentCannot tolerate any angular misalignment between shaft and housing or between shaft and axial support surfaces in the housing.
Needle roller / cylindrical roller thrust bearings
Dimension standardsBoundary dimensions: DIN 5429-1:2005
Tolerances
For additional information (→ Tolerances)
  • D: Normal
  • Fw: F6 (table 3)
  • d: E8 (table 3)
  • C: 0/–0,25 mm
  • C1: 0/–0,2 mm

Values:
  • Radial bearings → ISO 492:2014 (table 1)
  • Thrust bearings → ISO 199:2014 (table 4)
Operating clearance

Bearings without an inner ring

Range slightly less than Normal if recommended tolerances (table 5) applied
MisalignmentCannot tolerate any angular misalignment between shaft and housing or between shaft and axial support surfaces in the housing.
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