Deep Groove Ball Bearings SKF 6308 -2Z/C3

The SKF 6308 -2Z/C3 deep-groove ball bearing, with dimensions of 40x90x23 mm and a C3 clearance, ensures smooth running at elevated operating temperatures.

This single-row deep-groove ball bearing 6308 -2Z/C3 is designed primarily to accommodate radial loads as well as moderate axial forces in both directions. Manufactured from standard roller bearing steel (100Cr6) with a cylindrical bore and a sheet steel cage, this design combines dimensional stability with low rolling resistance. The cylindrical outer ring has neither a flange nor a ring groove, which allows for straightforward installation in standardised housing bores. The design complies with the standard tolerance class P0/PN (ABEC 1).

Under what operating conditions is the 6308-2Z/C3 deep groove ball bearing used?

The bearing is primarily used on rotating shafts with a diameter of 40 mm, where radial forces predominate. Thanks to the sheet metal end shields on both sides, this design is suitable for environments with moderate levels of contamination and dry dust particles. As the non-contact gap seals exert no friction on the inner ring, the torque remains low. Users choose this variant for bearing arrangements that are intended to operate with low maintenance whilst maintaining consistent lubrication.

What are the advantages of C3 bearing clearance and 2Z cover plates?

The slightly increased C3 radial bearing clearance compensates for thermal expansion when the shaft and bearing rings heat up during operation. In the case of tight fits, this additional clearance prevents the rolling elements from becoming stressed, which helps to extend service life. The permissible temperature range is from -20 to +120 degrees Celsius. The 2Z cover on both sides retains the factory-applied grease inside the bearing and protects the raceways from the ingress of coarser foreign particles.