Angular Contact Ball B. SKF 3303 ATN9/C3

The SKF 3303 ATN9/C3 double-row angular contact ball bearing combines compact dimensions of 17 × 47 × 22.2 mm with increased C3 clearance for combined loads.

The 3303 ATN9/C3 angular contact ball bearing is a double-row rolling bearing made from standard 100Cr6 bearing steel, which accommodates radial and axial forces on both sides. With a bore of 17 mm, an outer diameter of 47 mm and a width of 22.2 mm, this bearing corresponds to the standard design without a flange or groove on the outer ring. The manufacturer, SKF, produces the bearing to the enhanced tolerance class P6 or ABEC 3. Thanks to the integrated polyamide cage, the bearing runs quietly and operates within a temperature range of -20 to +120 degrees Celsius.

What is the 3303 ATN9/C3 double-row angular contact ball bearing suitable for?

The double-row angular contact ball bearing 3303 ATN9/C3 is particularly suitable for bearing arrangements where radial loads occur in conjunction with axial forces on both sides. Thanks to its contact angle of 30 degrees, the rolling bearing transmits tilting moments and guides shafts precisely even when the load direction changes. It is used in mechanical engineering and in gearbox units as a compact assembly that replaces two paired single-row bearings in a confined space.

What are the functions of the polyamide cage and the C3 bearing clearance in the 3303 bearing?

The designation C3 stands for a slightly increased radial clearance. This design compensates for thermal expansion when temperature differences arise between the inner and outer rings during operation, or when tight fits are specified. The polyamide cage reduces the weight of the rolling element set, dampens running noise and withstands continuous operating temperatures ranging from -20 to +120 degrees. In this open design without integrated sealing washers, the surrounding housing provides protection against the ingress of dirt, whilst lubrication is carried out using oil or grease.