Angular Contact Ball B. SKF 3202 ATN9

At SKF, the designation ATN9 refers to a polyamide cage. This material reduces the moving mass of the ball retainer and enables the bearing to run quietly. The permissible operating temperature range is between -20 and +120 degrees. The polyamide cage guides the rolling elements of both rows of balls at a defined distance.

This double-row roller bearing supports both radial and axial forces in both directions simultaneously. The two rows of balls act at a contact angle of 30 degrees, obliquely to the radial plane. This arrangement is therefore also suitable for supporting tilting moments, such as those that can occur with short support spans.

Bearings of tolerance class P6 or ABEC 3 have tighter tolerance ranges for dimensional and running accuracy than those with standard tolerances. This results in consistent concentricity and reduces vibrations at higher speeds. You should specifically choose this precision version if the bearing seats on the shaft and in the housing are of correspondingly fine tolerance.

As this is an open bearing without sealing washers, it is essential that lubrication is supplied via the surrounding environment. You can use suitable lubricating oils or rolling-element bearing greases, depending on the application and rotational speed. At the same time, the bearing housing must be structurally sealed to prevent the ingress of dirt and moisture.

The standard radial bearing clearance refers to the specified internal clearance between the inner ring, outer ring and rolling elements prior to installation. It is designed for standard fits and moderate operating temperatures. Once the bearing has been pressed onto the shaft seat, this clearance is reduced, enabling the bearing to achieve an even load distribution during operation.