Bearing data

Metric bearings

Single bearingsPairs of universally matchable bearings

Dimension standards

Boundary dimensions: ISO 15 and ISO 12044

Tolerances

For additional information
→ Tolerances
Normal dimensional and geometrical tolerances

Except for:

  • SKF Explorer bearings:
    • P6 dimensional tolerance
    • P5 geometrical tolerance
  • Bearings with D ≥ 400 mm:
    • P6 geometrical tolerance

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

Contact angle

  • suffix B → 40°
  • suffix AC → 25°
For availability of bearings with 30° contact angle, contact SKF.

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.

  • GA - light preload (standard)
  • GB - moderate preload
  • GC - heavy preload

Values (table 6) apply to unmounted bearing sets, arranged back-to-back or face-to-face.

Permissible misalignment

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


Misalignment increases bearing noise and reduces bearing service life, and when it exceeds the guideline values, these effects become particularly noticeable.

Inch bearings

Dimension standards

Boundary dimensions:
Standard BS 292:Part 2, withdrawn in 1997

Tolerances

For additional information
Tolerances

Normal
Values: BS 292:Part 2 (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.

Permissible misalignment

Misalignment increases bearing noise and reduces bearing service life.

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