Self-Aligning Ball B. SKF 2209 ETN9

The SKF 2209 ETN9 self-aligning ball bearing, with a 45 mm bore and a polyamide cage, provides reliable compensation for dynamic misalignment whilst maintaining compact installation dimensions.

The 2209 ETN9 self-aligning ball bearing is a double-row rolling bearing made from standard bearing steel (100Cr6) with a common hollow-spherical raceway in the outer ring. This design automatically compensates for misalignment and shaft deflection during operation. The SKF bearing has a cylindrical bore of 45 mm, an outer diameter of 85 mm and a width of 23 mm. With standard radial clearance and an open design, it is used in bearing arrangements requiring precise shaft guidance, where an external lubrication supply is provided.

In which applications is the 2209 ETN9 self-aligning ball bearing used?

This double-row bearing is particularly recommended for mounting positions where misalignment between the inner and outer rings may occur. Typical applications include bearing arrangements with longer shafts where elastic deflection occurs under load. Thanks to the hollow-spherical raceway of the outer ring, the two rows of balls can adjust their angular position. This counteracts edge pressures on the rolling elements and promotes smooth running under radial base loads in combination with moderate axial forces.

What are the distinctive features of the ETN9 polyamide cage?

The suffix ETN9 denotes a polyamide cage. This material reduces the moment of inertia of the rotating rolling element assembly and guides the balls elastically. The permissible temperature range extends from –30 to +120 degrees Celsius. As an open bearing without integrated seals, the bearing location requires a protective environment against foreign matter as well as a regular supply of lubricant. The bearing is manufactured to the standard tolerance class P0 or ABEC 1.