Deep Groove Ball Bearings SKF 6221 /C3

The SKF 6221 /C3 single-row deep groove ball bearing, with dimensions of 105 × 190 × 36 mm and increased bearing clearance, offers reliable running characteristics under demanding operating conditions.

The 6221/C3 deep groove ball bearing is an open, single-row radial ball bearing from SKF, made from standard rolling bearing steel (100Cr6). With a bore of 105 mm, an outside diameter of 190 mm and a width of 36 mm, this bearing primarily accommodates radial loads and axial forces in both directions. The integrated sheet steel cage guides the rolling elements precisely at operating temperatures ranging from -20 to +150 °C. Manufactured to tolerance class P0/PN (ABEC 1), this version is suitable for standardised installation in mechanical and plant engineering.

What is the 6221/C3 deep groove ball bearing suitable for?

It is recommended for use in bearing arrangements subject to high radial forces and requiring axial guidance in both directions. The design, which has no contact seals, allows for direct connection to circulating oil lubrication systems or an external grease supply. An increased internal bearing clearance is particularly advantageous when thermal effects or tight fits reduce the operating clearance. As the bearing is manufactured from 100Cr6 rolling-element bearing steel, the raceways and balls are designed to withstand high mechanical cyclic loads.

What distinguishes the 6221 deep-groove ball bearing with C3 clearance?

The C3 designation indicates a slightly increased radial clearance compared with the standard version. This increased clearance compensates for thermal expansion caused by heating during operation. The C3 bearing clearance helps to prevent the rolling elements from seizing if tight press fits on the 105 mm shaft or in the 190 mm housing cause the inner ring to expand. As the bearing is of an open design and has no sealing ring, the bearing housing must be protected from contamination by external housing seals.