Single row angular contact ball bearings

Internal clearance and preload

Internal clearance in single row angular contact ball bearings is only obtained after mounting and is dependent on adjustment against a second bearing, which provides axial location in the opposite direction.

SKF universally matchable bearings are produced in three different clearance and preload classes each. The classes for bearing sets with clearance are

• CA – smaller than Normal axial clearance
• CB – Normal axial clearance (standard)
• CC – larger than Normal axial clearance.

Bearings to clearance class CB are standard, or for some larger bearings class G clearance. The availability of bearings to other clearance classes can be obtained from matrix 1. SKF universally matchable bearings with clearance can be combined in sets of any number of bearings.

The classes for bearing sets with preload are

• GA – light preload (standard)
• GB – moderate preload
• GC – heavy preload.

Bearings to GA class preload are standard (matrix 1). Bearings with preload can only be paired in sets of two bearings, in contrast to the SKF universally matchable bearings with clearance, as otherwise the preload would increase.

The values for the clearance classes are provided in table 1 and table 2. The values for the preload classes are given in table 3.

The values apply to unmounted bearing sets, arranged back-to-back or face-to-face, and in case of clearance to zero measuring loads.