Bearing data

Metric bearings

Single bearingsPairs of universally matchable bearings
Dimension
standards

Boundary dimensions: 

ISO 15:2011 and ISO 12044:1995

Tolerances

For additional
information
(→ Tolerances)
Normal

Except for:
  • SKF Explorer bearings:
    • P6 dimensional accuracy
    • P5 running accuracy
  • Bearings with D ≥ 400 mm:
    • P6 running accuracy

Values: ISO 492:2014 (table 1, table 2, table 3)
Contact angle
  • Most common sizes: 40°
    For a 25° or 30° contact angle, contact SKF.
  • Larger bearings: 25° or 30°
Internal clearance
For additional
information
(→ Bearing internal clearance)
Obtained after mounting, depending on adjustment against a second bearing.
  • CA - smaller than Normal axial clearance (table 4)
  • CB - Normal axial clearance (standard) (table 4)
  • CC - larger than Normal axial clearance (table 4)
  • G (standard for larger bearings) - Normal axial clearance (table 5)
Values are valid for unmounted bearing sets, arranged back-to-back or face-to-face under zero measuring load.
Preload
For additional
information
(→ Bearing preload)
Obtained after mounting, depending on adjustment against a second bearing. Values apply to unmounted bearing sets, arranged back-to-back or face-to-face.
Misalignment

Back-to-back: ≈ 2 minutes of arc
Face-to-face: ≈ 4 minutes of arc

The permissible angular misalignment between the inner and outer rings 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. As a result, only approximate values are listed here.

Any misalignment increases bearing noise and reduces bearing service life.

Inch bearings
Dimension
standards

Boundary dimensions: 

Standard BS 292:Part 2:1982, withdrawn in 1997

Tolerances

For additional
information
(→ Tolerances)
Normal
Values: BS 292:Part 2:1982 (table 7)
Contact angle
20°
Internal
clearance

For additional
information
(→ Bearing internal clearance)
Obtained after mounting, depending on adjustment against a second bearing.
Preload

For additional
information
(→ Bearing preload)
Obtained after mounting, depending on adjustment against a second bearing.

Misalignment

The permissible angular misalignment between the inner and outer rings 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. As a result, only approximate values are listed here.

Any misalignment increases bearing noise and reduces bearing service life.

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