Deep Groove Ball Bearings SKF 6305 /C3

The SKF 6305/C3 single-row deep groove ball bearing, with dimensions of 25x62x17 mm and a C3 clearance, offers stable operation in the event of thermal shaft expansion.

The 6305/C3 deep groove ball bearing is a versatile rolling bearing designed for predominantly radial loads as well as moderate axial forces. This single-row model from SKF has a bore of 25 mm, an outside diameter of 62 mm and a width of 17 mm. Both the raceways and the rolling elements are made of standard roller bearing steel (100Cr6). As an open bearing without integrated seals, the design relies on lubrication via the surrounding machine housing. A robust sheet steel cage guides the balls evenly along the raceways.

In which applications does the 6305/C3 deep-groove ball bearing prove its worth?

Design engineers use this deep-groove ball bearing when shafts need to be supported at higher speeds and thermal expansion needs to be compensated for. Typical applications are found in general mechanical engineering, where there is a clean, lubricated housing environment. As the bearing is open at both ends, the lubricant can circulate freely. At the same time, the bearing location requires a housing-side seal to protect against dirt particles and moisture. Manufacture to tolerance class P0 (ABEC 1) ensures precise concentricity in standardised bearing seats.

What does the C3 bearing clearance mean in terms of design?

The designation C3 indicates a slightly increased radial bearing clearance compared with the standard version. This internal clearance helps to ensure that the bearing does not become unduly stressed due to operational heating or tight fits. If the inner ring is fitted to the shaft with a tight fit, it expands slightly, reducing the radial clearance. In the event of thermal differences between the inner and outer rings, the C3 clearance compensates for these variations. The bearing is designed for a temperature range of -20 to +150 degrees and is suitable for demanding thermal conditions.