Self-Aligning Ball B. SKF 2308 ETN9

SKF 2308 ETN9 double-row self-aligning ball bearing with polyamide cage, 40 mm bore and 90 mm outer diameter, designed to compensate for static and dynamic misalignment.

The SKF 2308 ETN9 self-aligning ball bearing is a double-row rolling bearing made from standard bearing steel (100Cr6). Thanks to the spherical raceway in the outer ring, the bearing automatically compensates for misalignment or slight shaft deflection. This open design without an integrated seal features a standard cylindrical bore, standard radial clearance and tolerance class P0/PN (equivalent to ABEC 1) for standard industrial applications.

What is the 2308 ETN9 self-aligning ball bearing suitable for?

The design compensates for misalignment between housing seats and elastic deflection of rotating shafts. Thanks to the self-aligning action in the outer ring, the rolling bearing reduces excessive edge pressures on the raceways. Typical applications include industrial shaft bearings where housing misalignment occurs or deflection under load is to be expected.

Thanks to the double-row ball arrangement, the design primarily accommodates radial forces whilst also handling axial forces in both directions. The open bearing design allows for flexible lubrication via the surrounding machine housing.

What advantages does the polyamide cage of the ETN9 design offer?

The suffix ETN9 denotes a polyamide cage with an adapted internal geometry. The plastic is characterised by its low weight, which keeps the inertial forces of the rolling element set to a minimum during changes in rotational speed. Furthermore, the cage operates with low friction and quietly.

Please note the permissible temperature range: for this material variant, the operating temperature is between –30 and +120 degrees Celsius.