Mounting should be carried out with the utmost care. Incorrect mounting of the bearing can lead to increased stress on the rolling element(s), which reduces the service life of the bearing!

Frame
Bearings have limited stiffness due to their relatively small cross-section compared to the diameter. Therefore, the support frame must be designed for maximum axial and radial stiffness.
Mounting surfaces must be flat and machining is therefore mandatory. They must be free of rust, paint, or burrs and have a good finish (3.2 to 6.3 µm CLA). Degreasing is required before installation.

Dm = average bearing diameter I = distance between two successive measurements

1. Full flatness (picture 1a)
The flat tolerance for the bearing surfaces is defined as follows:

2. Local flatness (picture 1b)
s-t = change in slope angle between two consecutive measurements taken at distance l.
s-t ≤ 0,0002 * l
where l is the distance between two fixing holes,
t+u = change of tilt angle between two successive measurements where the change of tilt occurs
t+u ≤ 0,0002 * I