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Bearing data

Metric bearings
Dimension
standards
Boundary dimensions: ISO 15:2011

Except for:
  • HJ angle rings: ISO 246:2007
  • Snap rings and grooves: ISO 464:1995
  • Locating slots: ISO 20515:2012
Tolerances

For additional
information
(→ Tolerances)
Normal dimensional tolerance
P6 geometrical tolerance
Check availability of P5 or P6 for bearings in the narrow 18, 19 and 10 series

Values: ISO 492:2014 (table 1, table 2, table 3)
Radial internal
clearance


For additional
information
(→ Bearing internal clearance)
Normal, C3
Check availability of other clearance classes

Values: ISO 5753-1:2009
Values are valid for unmounted bearings under zero measuring load.
Axial internal
clearance


For additional
information
(→ Bearing internal clearance)
Guideline values

When measuring the axial internal clearance the rollers may tilt, causing an enlargement of the measured axial clearance:
  • 2, 3 and 4 series: ≈ the radial internal clearance
  • 22 and 23 series: ≈ 2/3 the radial internal clearance
MisalignmentGuideline values
  • 10, 12, 2, 3 and 4 series: ≈ 4 minutes of arc
  • 20, 22 and 23 series: ≈ 3 minutes of arc

The values are not valid for bearings of the NUP design or the NJ design with an HJ angle ring. Axial stresses may be induced in the bearings, because they have two inner and two outer ring flanges and the axial internal clearance is relatively small.

The guideline values apply to non-locating bearings, provided the positions of the shaft and housing axes remain constant. Larger misalignment may be possible but may cause shorter bearing service life.

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.

For additional information, contact the SKF application engineering service.

Axial displacement
Bearings having no flange on either the inner or outer ring, or only one integral flange on the inner or outer ring can accommodate axial displacement of the shaft relative to the housing within certain limits (→ product table). During operation, axial displacement occurs within the bearing and not between the bearing and shaft or housing bore. As a result, there is virtually no increase in friction.
Inch bearings
Dimension
standards
Boundary dimensions: BS 292-2:1982, withdrawn in 1997
Tolerances

For additional
information
(→ Tolerances)
Normal

Values: BS 292-2:1982, withdrawn in 1997 (table 8)
Radial internal
clearance


For additional
information
(→ Bearing internal clearance)
Normal

Values: ISO 5753-1:2009 (table 4)
Values are valid for unmounted bearings under zero measuring load.
Misalignment
≈ 4 minutes of arc

The guideline values apply to non-locating bearings, provided the positions of the shaft and housing axes remain constant. Larger misalignment may be possible but may cause shorter bearing service life.

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.

For additional information, contact the SKF application engineering service.

Axial displacement
The bearings can accommodate axial displacement of the shaft relative to the housing within certain limits (→ product table). During operation, axial displacement occurs within the bearing and not between the bearing and shaft or housing bore. As a result, there is virtually no increase in friction.
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