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Bearing preload

Single direction bearings

An individual single direction angular contact thrust ball bearing cannot be preloaded until a second bearing provides location in the opposite direction. SKF single direction bearings are universally matchable as standard and are manufactured pre-set to two different preload classes:
  • class A, light preload
  • class B, moderate preload

The amount of preload depends on various factors and applies to bearing sets in back-to-back or face-to-face arrangements. Preload values are not standardized and are listed in the product table. The values do not cover influences from fits or operating conditions.

Bearing sets with a non-standard preload can be supplied on request. These bearing sets are identified by the designation suffix G followed by a number. The number is the mean preload value of the set expressed in daN.

Bearing sets consisting of three or four bearings have a heavier preload than sets with two bearings. The preload for these bearing sets is obtained by multiplying the values listed in the product table by a factor listed in table 1.

Double direction bearings

Preload values for double direction angular contact thrust ball bearings are not standardized and are listed in the product table. The values do not cover influences from fits or operating conditions.

Bearings with a different preload can be supplied on request.

Cartridge units

Cartridge units contain single direction bearings with class A or B preload values as standard (→ product table). Units containing bearings with a non-standard preload can be supplied on request. Bearing sets with a non-standard preload are identified by the designation suffix G followed by a number. The number is the mean preload value of the set expressed in daN.
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