Spherical Roller Bearings SKF 21311 E

The SKF 21311 E spherical roller bearing, with a 55 mm bore, compensates for angular misalignment and accommodates high radial loads in mechanical engineering.

The 21311 E self-aligning roller bearing is an open roller bearing from SKF in the Explorer series. With a bore of 55 mm, an outer diameter of 120 mm and a width of 29 mm, it is suitable for demanding industrial applications. Two symmetrical rows of rollers on a common hollow-spherical outer ring raceway enable the compensation of static and dynamic misalignments of the shaft. The integrated sheet steel cage guides the rollers evenly. Manufactured from standard roller bearing steel 100Cr6, the bearing is designed for operating temperatures ranging from -30 to +200 degrees.

What is the 21311 E self-aligning roller bearing suitable for?

This self-aligning roller bearing is particularly suitable for mounting positions subject to high radial loads where misalignment or shaft deflection occurs. Thanks to the spherical raceway in the outer ring, the roller pack self-aligns without generating excessive edge stresses. Typical applications include machine designs where there is a risk of deflection and misalignment. As the bearing is open at both ends, it can be specifically integrated into enclosed housings with external seals.

What are the advantages of the lubrication groove and P5 running accuracy in the 21311 E?

The 21311 E self-aligning roller bearing features a lubrication groove with lubrication holes on the outer ring. This feature facilitates relubrication whilst the bearing is installed, as the lubricant reaches directly between the rows of rollers. In terms of tolerances, this design combines standard dimensional accuracy (PN) with increased running accuracy of class P5. This promotes low-vibration operation with even load distribution. The standard radial bearing clearance is designed to provide the appropriate operating clearance during standard operation with typical fit selections.