Deep Groove Ball Bearings SKF 4308 ATN9

The SKF 4308 ATN9 double-row deep groove ball bearing, with a 40 mm bore and a polyamide cage, provides a robust bearing solution for combined loads.

Thanks to its two rows of balls, the SKF 4308 ATN9 double-row deep groove ball bearing can accommodate higher radial loads than single-row variants with the same bore. With dimensions of 40 mm inner diameter, 90 mm outer diameter and a width of 33 mm, this rolling bearing is suitable for compact installation spaces subject to increased loads. The rings and rolling elements are made of standard roller bearing steel (100Cr6). As an open bearing, this design can be flexibly integrated into existing lubrication systems.

What is the 4308 ATN9 double-row deep groove ball bearing suitable for?

Design engineers opt for this double-row bearing when single-row deep groove ball bearings reach their load-carrying capacity limits, but the installation space does not require a roller bearing. The bearing primarily transmits radial forces, but also supports axial forces in both directions. Typical applications can be found in general mechanical engineering, in gearboxes or on pump shafts. As the outer ring has no flange or groove, it can be easily slid into cylindrical housing bores.

What features does the ATN9 polyamide cage offer in this bearing?

The suffix ATN9 denotes a polyamide cage. Polyamide cages are characterised by their low mass and quiet operation. The permissible temperature range is from –20 to +120 degrees Celsius. The standard radial clearance (CN) and the standard tolerance P0 (ABEC 1) are sufficient for common fits at moderate operating temperatures. As the bearing is unsealed, a housing seal provided by the customer protects against dirt and lubricant loss.