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Bearing data

Y-bearings with grub screws (series YAT 2, YAR 2, YARAG 2)

Dimension standards
Boundary dimensions: ISO 9628:2006
Bearings in the YAT 2 series are not standardized. However, the bore and outside diameter and the outer ring width are in accordance with ISO 9628:2006.

Tolerances
Values for the bore and outside diameter are listed in table 1.
The values for bore and outside diameter tolerances are slightly tighter than those listed in ISO 9628:2006.
For additional information, refer to Tolerances.

Radial internal clearance
ISO 9628:2006 – Group N
Values are listed in table 3.
Values are valid for unmounted bearings under zero measuring load.
For additional information, refer to Bearing internal clearance.

Static misalignment
Y-bearings can accommodate initial misalignment by tilting in the housing (fig. 1), because of their sphered outside surface. The permissible values are:

  • SKF housings
    • relubrication is not required → 5°
    • relubrication is required (where applicable) → 2°
  • SKF pressed steel housings
    • Misalignment cannot be accommodated once the attachment bolts have been fully tightened, unless a rubber seating ring is used.

Dynamic misalignment
Y-bearings can accommodate a few minutes of arc (misalignment) between the inner and outer rings.

Y-bearings with an eccentric locking collar (series YET 2, YEL 2, YELAG 2)

Dimension standards
Boundary dimensions: ISO 9628:2006

Tolerances
Values for the bore and outside diameter are listed in table 1.
The values for bore and outside diameter tolerances are slightly tighter than those listed in ISO 9628:2006.
For additional information, refer to Tolerances.

Radial internal clearance
ISO 9628:2006 – Group N
Values are listed in table 3.
Values are valid for unmounted bearings under zero measuring load.
For additional information, refer to Bearing internal clearance.

Static misalignment
Y-bearings can accommodate initial misalignment by tilting in the housing (fig. 1), because of their sphered outside surface. The permissible values are:

  • SKF housings
    • relubrication is not required → 5°
    • relubrication is required (where applicable) → 2°
  • SKF pressed steel housings
    • Misalignment cannot be accommodated once the attachment bolts have been fully tightened, unless a rubber seating ring is used.

Dynamic misalignment
Y-bearings can accommodate a few minutes of arc (misalignment) between the inner and outer rings.

Y-bearings with SKF ConCentra locking technology (series YSP 2, YSPAG 2)

Dimension standards
Boundary dimensions: not standardized
However, the outside diameter and the outer ring width are in accordance with ISO 9628:2006.

Tolerances
Values for the outside diameter are listed in table 1.
Before mounting, the sleeve bore is larger than the nominal value to ease sliding on the shaft.
For additional information, refer to Tolerances.

Radial internal clearance
ISO 9628:2006 – Group 3
Values are listed in table 3.
Values are valid for unmounted bearings under zero measuring load.
For additional information, refer to Bearing internal clearance.

Static misalignment
Y-bearings can accommodate initial misalignment by tilting in the housing (fig. 1), because of their sphered outside surface. The permissible values are:

  • SKF housings
    • relubrication is not required → 5°
    • relubrication is required (where applicable) → 2°
  • SKF pressed steel housings
    • Misalignment cannot be accommodated once the attachment bolts have been fully tightened, unless a rubber seating ring is used.

Dynamic misalignment
Y-bearings can accommodate a few minutes of arc (misalignment) between the inner and outer rings.

Y-bearings with a tapered bore (series YSA 2)

Dimension standards
Boundary dimensions: JIS B 1558:2009
Adapter sleeves in the H 23 series: ISO 2982-1:2013

Tolerances
Values for the outside diameter are listed in table 1.
The tapered bore fits H 23 series adapter sleeves, for metric and inch shafts.
For additional information, refer to Tolerances.

Radial internal clearance
ISO 9628:2006 – Group 3
Values are listed in table 3.
Values are valid for unmounted bearings under zero measuring load.
For additional information, refer to Bearing internal clearance.

Static misalignment
Y-bearings can accommodate initial misalignment by tilting in the housing (fig. 1), because of their sphered outside surface. The permissible values are:

  • SKF housings
    • relubrication is not required → 5°
    • relubrication is required (where applicable) → 2°
  • SKF pressed steel housings
    • Misalignment cannot be accommodated once the attachment bolts have been fully tightened, unless a rubber seating ring is used.

Dynamic misalignment
Y-bearings can accommodate a few minutes of arc (misalignment) between the inner and outer rings.

Y-bearings with a standard inner ring (series 17262, 17263)

Dimension standards
Boundary dimensions: ISO 15:2011, except for the sphered outside surface

Tolerances
Normal
Values: ISO 492:2014 (table 2), except for the sphered outside surface (table 1)
For additional information, refer to Tolerances.

Radial internal clearance
Normal
Values: ISO 5753-1:2009 (table 4)
Values are valid for unmounted bearings under zero measuring load.
For additional information, refer to Bearing internal clearance.

Static misalignment
Y-bearings can accommodate initial misalignment by tilting in the housing (fig. 1), because of their sphered outside surface. The permissible values are:

  • SKF housings
    • relubrication is not required → 5°
    • relubrication is required (where applicable) → 2°
  • SKF pressed steel housings
    • Misalignment cannot be accommodated once the attachment bolts have been fully tightened, unless a rubber seating ring is used.

Dynamic misalignment
Y-bearings can accommodate a few minutes of arc (misalignment) between the inner and outer rings.

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