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Bearing data

Metric bearings

Dimension standards

Boundary dimensions: ISO 15

Except for:

  • HJ angle rings: ISO 246
  • Snap rings and grooves: ISO 464
  • Locating slots: ISO 20515

Tolerances

For additional information → Tolerances

  • Normal dimensional tolerance
  • P6 geometrical tolerance

Check availability of P5 or P6 tolerance class for bearings in the 10 series


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

Radial internal clearance

For additional information → Selecting internal clearance or preload

  • Normal, C3

Check availability of other clearance classes


Values: ISO 5753-1


Values are valid for unmounted bearings under zero measuring load.

Axial internal clearance

For additional information → Selecting internal clearance or preload

Guideline values:

When measuring the axial internal clearance the rollers may tilt, causing an enlargement of the measured axial clearance:

  • 10, 18, 19, 2, 3 and 4 series: ≈ the radial internal clearance
  • 22, 23, 29 and 39 series: ≈ 2/3 the radial internal clearance

Permissible misalignment

  • 10, 12, 18, 19, 2, 3 and 4 series: ≈ 4 minutes of arc
  • 20, 22, 23, 29 and 39 series: ≈ 3 minutes of arc

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

The values are not valid for bearings of the NUP design or the NJ design with an HJ angle ring.

Permissible axial displacement (fig. 1)

smaxproduct table


Bearings having no flange, or only one integral flange on either the inner or outer ring, can accommodate axial displacement. Displacement of the shaft relative to the housing occurs within these bearings. As a result, there is virtually no increase in friction.

Inch bearings

Dimension standards

Boundary dimensions: BS 292-2

Tolerances

For additional information → Tolerances

Normal


Values: BS 292-2 (table 8)

Radial internal clearance

For additional information → Selecting internal clearance or preload

Normal


Values: ISO 5753-1 (table 4)


Values are valid for unmounted bearings under zero measuring load.

Permissible misalignment

≈ 4 minutes of arc


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

Permissible axial displacement (fig. 1)

smaxproduct table


The bearings can accommodate axial displacement of the shaft relative to the housing within the bearing. As a result, there is virtually no increase in friction.

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