Self-Aligning Ball B. SKF 1209 ETN9

The SKF 1209 ETN9 double-row self-aligning ball bearing, measuring 45x85x19 mm, compensates for misalignment and supports shafts with normal radial clearance.

The 1209 ETN9 self-aligning ball bearing is a double-row rolling bearing made from standard 100Cr6 bearing steel with a cylindrical bore. The shared spherical raceway in the outer ring allows the rows of balls to deflect, enabling this component to compensate for misalignment between the inner and outer rings. Maintenance engineers and designers often use this design when elastic shaft deflection occurs or misalignment between bearing seats needs to be compensated for.

What is the 1209 ETN9 self-aligning ball bearing suitable for?

This bearing is primarily suitable for designs with long shafts or separate bearing housings, where misalignment is unavoidable due to operational conditions. The design tolerates moderate misalignments without causing additional edge pressures on the rolling elements. In combination with the standard tolerance class P0/PN or ABEC 1, the component meets the typical requirements in general mechanical and plant engineering, where a backlash-free guidance system is not strictly required.

What are the advantages of the polyamide cage in an open bearing?

The polyamide material gives the cage a low mass and good damping properties under dynamic accelerations. The bearing is designed for an operating temperature range of –30 to +120 degrees, which easily covers standard thermal applications. As this is an open bearing without integrated sealing washers, you are free to select the lubricant to suit the ambient conditions and integrate the bearing location into an external sealing system.