SKF 6311-2RS1/C3 Rubber Sealed Single Row Deep Groove Ball Bearing 55x120x29mm

The SKF 6311-2RS1/C3 sealed deep groove ball bearing provides dependable support for 55mm shafts operating under substantial radial loads and moderate axial forces in either direction. Its 120mm outside diameter and 29mm width make it a heavy-section bearing suitable for industrial machinery with appropriately sized housings. SKF Explorer construction combines optimised internal geometry with high-quality bearing steel and a sheet metal cage. The bearing has a basic dynamic load rating of 74.1kN and a basic static load rating of 45kN, making these specifications important when assessing fatigue life, peak loads and suitability for demanding operating cycles.

The 2RS1 rubber contact seals provide protection on both sides, retaining factory-applied grease and helping exclude dirt, moisture and other contaminants. The C3 clearance designation is especially important: it specifies greater than normal initial radial internal clearance, rather than the standard CN clearance of the otherwise similar 6311-2RS1. This can be beneficial where interference fits or temperature differences reduce clearance during operation, but the correct clearance must still be selected for the machine's actual conditions. SKF specifies a limiting speed of 3,800rpm for this contact-sealed configuration. Unlike the reference speed of an open bearing, this limiting speed is particularly relevant when assessing seal friction and heat generation. Confirm the full designation, mounting fits and operating temperature before replacement.

Typical Applications:

Industrial electric motors with C3 clearance requirements

Centrifugal pumps and heavy-duty circulation equipment

Industrial gearboxes and mechanical power transmission

Conveyor drive shafts and processing machinery

Agricultural and construction equipment drive assemblies