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Bearing data

Metric bearings

Single bearingsMatched bearings
Dimension
standards
Boundary dimensions:
ISO 355:2007

Except for:
  • Bearings with a J designation prefix: ANSI/ABMA Standard 19.1-1987 (1999)
Boundary dimensions:
ISO 355:2007 (single bearing)
Tolerances

For additional
information
(→ Tolerances)
  • Normal, improved running accuracy for bearings with a CL7C designation suffix
  • Check availability of reduced width tolerance to 6 X tolerance class (designation suffix CLN) or P5

Except for:
  • Bearings with a J designation prefix:
    6X

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

The inner rings with roller and cage assembly and outer rings of SKF single row tapered roller bearings with the same basic designation are interchangeable. The tolerance for the total abutment width T of the bearing is not exceeded if the cups and cones are interchanged.
  • Normal, improved running accuracy for bearings with a CL7C designation suffix
  • Check availability of P5

Values:
ISO 492:2014 (table 1, table 3)

Total width tolerances:
not standardized (table 4)

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

Standard: table 5

Other clearances are identified by the designation suffix C.

Values are valid for unmounted bearing sets under measuring loads of:

  • D ≤ 90 mm
    → 0,1 kN
  • 90 < D ≤ 240 mm
    → 0,3 kN
  • D > 240 mm
    → 0,5 kN
Preload
For additional
information
(→ Bearing preload)
Obtained after mounting, depending on adjustment against a second bearing.
Misalignment

TQ-line bearings (designation suffix Q), SKF Explorer and SKF E2 bearings:

≈ 2 to 4 minutes of arc

If misalignment cannot be avoided, SKF recommends not to use basic design bearings.


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.

If misalignment cannot be avoided, SKF recommends using a face-to-face arrangement.

Any misalignment increases bearing noise and reduces bearing service
life.

Inch bearings
Dimension
standards

Boundary dimensions:
AFBMA Standard 19-1974 (ANSI B3.19-1975)

ANSI/ABMA Standard 19.2 has replaced the above standard, but does not include dimensions.

Tolerances

For additional
information
(→ Tolerances)
  • Normal, improved running accuracy for bearings with a CL7C designation suffix
  • Check availability of CL3, CL0 or reduced width tolerance

Values: ANSI/ABMA Standard 19.2-2013 (table 6)

Deviating width tolerances for cups and cones are identified by a designation suffix (table 7).

The inner rings with roller and cage assembly and outer rings of SKF single row tapered roller bearings with the same basic designation are interchangeable. The tolerance for the total abutment width T of the bearing is not exceeded if the cups and cones are interchanged.
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

TQ-line bearings (designation suffix Q):

≈ 2 to 4 minutes of arc

If misalignment cannot be avoided, SKF recommends not to use basic design bearings.


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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