Deep Groove Ball Bearings SKF 6303 -2Z/C3

The SKF 6303 -2Z/C3 single-row deep groove ball bearing (17x47x14 mm) features non-contact lip seals and increased bearing clearance for thermally stressed drives.

The SKF 6303 -2Z/C3 deep groove ball bearing is a single-row radial ball bearing to standard tolerance class P0/ABEC 1, with a 17 mm bore, 47 mm outer diameter and 14 mm width. The rings and rolling elements are made of standard 100Cr6 rolling-element steel. A robust sheet-steel cage guides the balls evenly into the deep raceways. Thanks to the metal shields on both sides (2Z), the design protects the interior from coarse contamination without reducing the limiting speed due to friction.

For which operating conditions is the 6303-2Z/C3 deep groove ball bearing suitable?

This ball bearing primarily accommodates radial forces as well as moderate axial forces in both directions. The design is suitable for rotating shaft mountings subject to radial loads and elevated operating temperatures. As the two end plates provide a non-contact seal, the bearing operates with low friction even at high speeds. The permissible temperature range is from –20 to +120 degrees Celsius. This design is primarily intended for use in dry environments where solid particles must be kept out.

What are the advantages of the increased C3 bearing clearance?

The additional designation C3 indicates a slightly increased radial bearing clearance compared with the standard version. The internal clearance compensates for thermal expansion when the shaft and housing reach different operating temperatures. The clearance also accommodates dimensional constrictions caused by tight fits when the inner ring is pressed onto the 17 mm shaft. For applications involving heat build-up during continuous operation, the C3 class counteracts internal stresses and ensures quiet, smooth running across the entire speed range.