Design considerations

Ball protrusion

The balls of some bearings in the 12 and 13 series protrude from the side faces of the bearing (fig. 1). The values of the protrusion are listed in the product table and should be considered when designing components in close proximity to the bearing.

Bearings on sleeves
Self-aligning ball bearings with a tapered bore can be mounted with:
  • an adapter sleeve on plain (a) or stepped shafts (b) (fig. 2)
  • a withdrawal sleeve on stepped shafts (fig. 3)

Adapter sleeves are supplied complete with a locking device.

For appropriate SKF adapter sleeves, refer to product table.

When using sealed bearings, make sure appropriate SKF adapter sleeve assemblies (e.g. E design sleeve, refer to product table) are used to prevent the locking device from interfering with the seal (fig. 4). Alternatively, use a spacer ring between the bearing and the lock washer.

For additional information about sleeves, refer to Bearing accessories or use the Adapter sleeve - Tool and accessory selector.

Bearings with an extended inner ring

When two of these bearings are used to support a shaft, to locate the shaft axially the inner ring slots must be arranged facing towards or away from each other (fig. 5).

Appropriate bearing housings

Appropriate SKF bearing housings are available in a variety of designs and sizes for a wide range of applications. The designs include:

  • SNL, SE plummer (pillow) block housings in the 2, 3, 5 and 6 series
  • FNL flanged housings
  • SAF plummer (pillow) block housings for inch shafts 

For additional information, refer to Bearing housings.

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